Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Correlations of Singly and Doubly Charged Projectile Fragments with Secondary Charged Particles Produced in 32S-Emulsion Interactions at 3.7A and 200A GeV
1
6
EN
Wafaa
Osman
Bahr
Physics Department ,Faculty of Science,Cairo University,Cairo,Egypt
wafaabahr61@gmail.com
Maha
fayed
Abdel Moniem
0000-0002-1804-0081
Physics Department,faculty of science,Cairo University,Cairo,Egypt
maha_fayed@hotmail.com
10.21608/ajnsa.2018.4838.1111
The multiplicity correlations amongst the singly (NP) and doubly (Nalpha) charged projectile fragments and the secondary charged target fragments (black, grey and shower tracks) produced in 32S–Emulsion interactions at 3.7A and 200A GeV are studied to shed some light on the interface of spectator and participant region. The effect of changing the energy used for 32S-Emulsion interactions is investigated as well, indicating that the values of ˂ NP ˃ and ˂ Nalpha ˃ at both incident energies having the same values within experimental errors. With an increasing number of singly charged projectile fragments NP, the impact centrality is shown to be increased. The correlation between the mean multiplicities of secondary charged particles and both of the singly and doubly charged projectile fragments are observed. The relation between the variation of mean values of black and heavy ionized particles is observed and found to be independent of the production of singly charged fragments
32S-Emulsion,Projectile Fragments,Participant -Spectator Model,Secondary Charged Particles
https://ajnsa.journals.ekb.eg/article_19226.html
https://ajnsa.journals.ekb.eg/article_19226_5a54dfe8976680d7231d93461423ac9e.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Mechanical and gamma ray attenuation properties of N316L steel treated by rf plasma as a nuclear material
7
12
EN
Aly
Saeed
Nuclear Power Stations Department, Faculty of Engineering, Egyptian - Russian University
aly_8h@yahoo.com
M.
Eissa
Professor of Steel Technology, CMDRI
mamdouh_eissa@yahoo.com
F.
El-Hossary2
Profesor of Plasma Physics, Faculty of Science, Sohag University
felhossary@yahoo.com
Samir
EL-Kameesy
Physics Department, Faculty of Science, Ain Shams University
samirkhamisy@yahoo.com
Al-Zahraa
Abd Elmoula
Physics Department, Faculty of science, Sohag University
a.zahra@yahoo.com
samah
Al-Shelkamy
Physics Dep. Faculity of science, South Valley University
samahsemi2006@yahoo.com
10.21608/ajnsa.2019.2936.1059
The effect of plasma surface engineering on average surface roughness, wettability and gamma ray attenuation properties of AISI316L standard steel sample were carried out. The results showed an increase in surface roughness accompanied with an increase in the surface energy and a decrease in the contact angle of N316L sample treated by plasma carbonitriding. The experimental measurements of gamma ray attenuation properties of the investigated stainless steel alloys were carried out using gamma lines emitted from 232Th and 60Co gamma ray sources. The attenuation parameters such as linear and mass attenuation coefficients and half value layer were determined experimentally and theoretically. The obtained results indicated that the rf plasma surface treatment is an effective method for developing the surface tribological properties of treated stainless steel alloy without any change in the gamma ray attenuation properties. The obtained results suggest the suitability of N316L for in-core applications of nuclear reactor systems.
rf plasma,AISI316L,roughness,wettability,Gamma ray,reactor materials
https://ajnsa.journals.ekb.eg/article_25453.html
https://ajnsa.journals.ekb.eg/article_25453_5eadced30ed2ca0d672bc30679f717dc.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Electromigration and Polarization in Schottky Contacts CdTe Based Compounds
13
18
EN
Hassan
Elhadidy
Faculty of Mathematics and Physics, Institute of Physics, Charles University,
Ke Karlovu 5, Prague CZ 121 16, Czech Republic.
elhadidy@ipm.cz
10.21608/ajnsa.2019.7088.1165
In this work, studies of both transient phenomena, electromigration and polarization, are present. Electromigration measurements have been carried out at different temperatures on low resistivity p - type CdTe sample with two Au Schottky contacts. Comparative measurements at different T were succeeded by etching the anode contact and a thin later below after each measurement and make a new contact. Temporal conductance of the depletion layer was measured and mobility, acceptor concentrations, diffusion coefficients of the mobile ions and the activation energy of the electromigration process were extracted. Pockels effect technique has been used to study the polarization effect in high resistivity CdZnTe with Au Schottky contacts. Time dependence of Pockels effect measurements was carried out at different T. The analysis of these data revered that the energy of the deep donor level responsible for the polarization effect in the studied sample is Ec-0.8771eV, with capture cross section 8.71x10-13 cm2.
Transient phenomena,CdTe and CZT,Electromigration,Polarization effect
https://ajnsa.journals.ekb.eg/article_27020.html
https://ajnsa.journals.ekb.eg/article_27020_c2d2e8fcadc0ec801b110c4c6982b6d4.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
A study on protection against the radioactive hazards during transportation of naturally occurring radioactive materials
19
23
EN
Ahmed
Massoud
Ahmed
https://orcid.org/00
Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt
amassouda1@yahoo.com
10.21608/ajnsa.2019.6816.1160
In this work the radiation dosages and hazards that are emerging due to dose that are facing the drivers and workers who are involved in transporting naturally occurring radioactive materials NORM in Egypt, were assessed and compared with the accepted doses in many countries. Two scenarios were used: the first was the truck driver scenario, while the second was loading-unloading workers scenario. Workers’ scenario was used in this study for evaluating the dose and risk to workers who process recycled materials. The annual working hours for truck drivers were selected according to normal and heavy and abnormal duties as 200, 400 and 600 hours. Working hours for loading-unloading staff were also selected under various conditions of duties to be 50, 100 and 150 annual hours. External and internal exposure for drivers and workers were estimated according to the properties of materials. Zircon, phosphate and bauxite were the assumed cargos. The dose due to inhalation of contaminated dust were considered in addition to the external dose of γ-radiation.
Radiation,hazards,NORM,exposure dose
https://ajnsa.journals.ekb.eg/article_27293.html
https://ajnsa.journals.ekb.eg/article_27293_ccd2ae76ca4bd3ec7fee4ddf555ec687.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Effect of Nano-Filler Content and Fiber Treatment on the Characteristics of Gamma-irradiated Rice Husk-Epoxy Particleboard Composites.
24
34
EN
Hoda
Abdel-Rahman
0000-0002-3454-4669
Radiation chemistry department
drhodaas2006@yahoo.com
Maha
M.
Younes
Radiation chemistry department
maha_mohamed_younes@yahoo.com
Eman
Hamed
Radiation chemistry Department
emanhamed2010@yahoo.com
10.21608/ajnsa.2019.4835.1112
In this study, both untreated and treated rice husk fibers with a silane coupling agent are incorporated with epoxy resin to prepare particleboard composites. The effect of different ratios of nanoclay 5%, 10%, 15%, and 20% (by the weight of the polymer) on the physicomechanical properties of the prepared particleboard composites is investigated. The results show that the flexural, and impact strengths as a function of mechanical properties getting better with increasing nanoclay content up to 10%. While the addition of nanoclay to the samples decreases the water absorption percentage. This decrease is almost constant with nanoclay (%). In addition, the effect of different doses of gamma-irradiation on the properties of both untreated and treated rice husk-epoxy particleboard composites that containing 10% of nanoclay is also discussed. The results show that the irradiated specimens at a dose of 10kGy achieved a good enhancement in mechanical properties whereas the water absorption percentage as a physical property decreases at a dose of 10kGy and starts to increase with increasing gamma irradiation doses. TGA, and SEM are carried out to confirm the data obtained.
nanoclay,epoxy resin,gamma-irradiation,particleboard composite,TGA.
https://ajnsa.journals.ekb.eg/article_27355.html
https://ajnsa.journals.ekb.eg/article_27355_8d748d1f3c29415d6cbe401e7ef117ac.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Investigation of Thermal-Hydraulic Behavior of Supercritical Water Reactor Using Thorium-Uranium Oxide Fuel (ThO2 – UO2)
35
44
EN
salwa
helmy
Nuclear and Radiological Regulatory Authority (NRRA), Cairo, Egypt
salwahelmy31@yahoo.com
Adel
Fahmy
Reactors Department, Nuclear ResearchCenter, Atomic Energy Authority, P.O.13759, Cairo, Egypt
adelalyan@yahoo.com
Adel
El-Feky
Reactors Department, Nuclear ResearchCenter, Atomic Energy Authority, P.O.13759, Cairo, Egypt
elfiqi02@hotmail.com
Neama
El-Sahlamy
Nuclear and Radiological Regulatory Authority (NRRA), Cairo, Egypt
eng.neama@yahoo.com
Hesham
Hasaneen
Elkhatib
bNuclear reactors department, NRC Center,
Egyptian Atomic Energy Authority
heskhatib1966@yahoo.com
10.21608/ajnsa.2019.4062.1094
A computer program by (EES), Engineering Equation Solver has been produced for inquiry of the fuel, clad and coolant temperatures under supercritical conditions for supercritical water reactor powered by ThO2 – UO2 mixture as a fuel. In the calculation, uniform axial heat flux and average channel were considered. The bulk fluid, clad and fuel temperatures along fuel length were obtained for supercritical pressures 26, 30 and 40 (MPa). Also the UO2 percentage added to ThO2 was varied as, 4% and 10%. It was found that the maximum fuel temperature reached 2193 (oC) in case of 4% UO2 and 2182 (oC) in case of 10% UO2, which is surpasses the industry limit of 1850 (OC).Thermal conductivity is essential parameterto understand the performance of the fuel pin under irradiation.Other important thermo-physical properties to be considered are melting point and density.Thorium and uranium oxide fuels utilized in nuclear reactors have very high melting point, but low density and they suffer from poor thermal conductivity
Key Words -(Th,U)O2 pellets,thermal conductivity,thermal hydraulic,supercritical
https://ajnsa.journals.ekb.eg/article_27356.html
https://ajnsa.journals.ekb.eg/article_27356_2233b40df727999c45af9abb4e38e333.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
An assessment of impact toughness of the pressure vessel steel A533-B and its 308 austenitic stainless steel weld metal
45
53
EN
Omyma
Hassan
Ibrahim
Metallurgy department, materials division, nuclear research center
omymaibrahim95@gmail.com
ibrahim
Soliman
ibrahim
Nuclear and Radiological Regulatory Authority, Egypt
ibrasol2@yahoo.com
10.21608/ajnsa.2019.6220.1136
The steel A533-B is a low alloy steel used as a structural material for the construction of light water nuclear reactor pressure vessels. It is normally cladded with the 308 austenitic stainless steel weld metal overlay for protection against extension of surface flaws generating during operation. In this investigation the impact toughness of the A533-B steel and its 308 weld metal were evaluated. The microstructure of the A533-B steel consisted of bainitic structure while that of the 308 weld metal comprised austenite with ferrite phase of about 5%. The impact toughness was assessed using instrumented impact testing machine at temperatures between -196 and 300 C. The determined impact toughness parameters involved the total impact fracture energy, the energy expended in the fracture crack initiation and crack propagation, the ductile to brittle transition temperature as well as the dynamic yield strength. The A533-B steel exhibited distinct ductile to brittle transition behavior with superior resistance to ductile fracture at high test temperatures. In contrast, the 308 weld metal did not display such transition. However, it showed low energy ductile fracture performance with evident resistance to brittle fracture even at low test temperatures. The findings were substantiated with the load-time traces derived from the instrumented impact tests as well as the fracture surface morphology. The results were discussed in relation to the difference in microstructure and flow properties of the examined steels.
A533-B steel,308 weld meta,impact toughness
https://ajnsa.journals.ekb.eg/article_28429.html
https://ajnsa.journals.ekb.eg/article_28429_688ed8c312a7410b305365bfe979823e.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Long-term and flares variability of Fermi LAT FSRQ 4C +21.35
54
61
EN
Mohamed
Hashad
Basic Science Department, Modern Academy for Engineering and Technology, Maadi, Egypt.
mhashad64@yahoo.com
Yasser
Abdou
Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
yasser.abdou@science.tanta.edu.eg
Ibrahim
Bounduok
Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
bounduok@gmail.com
Hussein
Badraan
Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
hussein_badran@hotmail.com
10.21608/ajnsa.2019.3402.1078
We present a long term light curve (LC) of the flat spectrum radio quasar (FSRQ) 4C +21.35 (also known as PKS 1222+216, z=0.432) observed by the Fermi Large Area Telescope (LAT) during the first seven years of the mission with weekly time binning in the energy range 0.2–50 GeV. The highest weekly integral flux was reached on MJD = 55365 (2010, Jun. 18). The variability of the source emission was studied with 12 hour time binning in two energy bands 0.2 – 0.8 GeV and 0.8 – 50 GeV. Three different statistical methods, the structure functions (SF), auto-correlation functions (ACF), and fast fourier transformer were used to study the time scales. For the 7 year-weekly binning light curve, 18 week time scale was observed. Flare I seems to have the same time scales for both energy ranges as well. Therefore the outbursts during flare I may come from the same emission mechanism/s, CCF between the two energy bands have also emphasized it. Flare II did not give significant results, CCF illustrated 6.5 day time lag that indicates the emission mechanism of the low energy band came before the high energy one with 6.5 day with a typical physical process.
Non-thermal FSRQ,Individual 4C+21.35,Active Galaxies,Statistics
https://ajnsa.journals.ekb.eg/article_28573.html
https://ajnsa.journals.ekb.eg/article_28573_021f0e239a28216ade73659bea820730.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Estimation of Radiation Hazards of Natural Radionuclides in Archaeological Site (Tanis), Egypt
62
71
EN
Safwat
Salama
RPF, ETRR-2, EAEA
topazgemss@yahoo.com
nassif
mansour
department of physics- faculty of science- zagazig university- Egypt
nassif_mansour@hotmail.com
Nabil
Hassan
https://orcid.org/00
1: Department of Physics, Faculty of Science, Zagazig University, Zagazig, P.O. Box 44519, Egypt
2: Department of Natural Radiation Safety, Korea Institute of Nuclear Safety 62, Gwahak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea
nmmh1976@zu.edu.eg
10.21608/ajnsa.2019.3489.1081
Natural radionuclides of 238U (226Ra), 232Th and 40K maintained in the earth crust (soil) of Archaeological Site (Tanis, San Al-Hagar, Sharqai, Egypt) were measured using γ-ray spectroscopy system equipped with High pure germanium detector (HPGe). 20 soil samples were collected from the ground surface of tomb rooms, roads among tombs and the outer empty space of Tanis. Arithmetic mean value of radionuclides concentrations in the studied samples were 5.96 ± 1.46 Bq kg-1 for 226Ra, 3.78 ± 1.60 Bq kg-1 for 232Th and 70.34 ± 7.20 Bq kg-1 for 40K, respectively. All the studied natural radionuclides had concentrations values less than worldwide recommended value of 35, 30, 400 Bq kg-1 for 226Ra, 232Th and 40K, respectively. Furthermore, the radiation dose in that site was measured using Digilert100 radiation survey meter and its mean value was of 0.52 ± 0.13 μSv h-1 which much lower than safety limit. Moreover, Radiological hazards indices of radium equivalent activity (Raeq), external (Hex) and internal hazard indices (Hin), alpha and gamma radiation indices and annual effective dose due to the presence of those radionuclides were calculated and had values less than worldwide limit. These results implied that the Tourists can safely visit and stay in this site (San Al-Hagar) as much as they want.
Natural Radionuclides,HPGe,Hazard indices,Radiation Dose,Soil,archaeological site,Egypt
https://ajnsa.journals.ekb.eg/article_28574.html
https://ajnsa.journals.ekb.eg/article_28574_5aed579f3de2bc0bbd138ab68d9a5878.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
A Further Analysis of Laser Induced Breakdown Spectroscopy Ink Pens’ Spectra Using Principal Component Analysis (PCA) for Forensic Characterization
72
78
EN
Osama
Fekry
Al Balah
National Institute of Laser Enhanced Sciences (NILES), Cairo University
osama.f.alblah@niles.edu.eg
Olodia
Aied Taha Nassef
National Institute of Laser Enhanced Science, Cairo University
onassef@niles.edu.eg
10.21608/ajnsa.2019.4231.1097
Background: Because characterization of ink pens on documents represents an important forensic discipline, the need of legal systems for faster, in-situ and more accurate technique that identify and differentiate questioned documents involved in criminal or legal matters is of great interest. Laser-induced breakdown spectroscopy (LIBS) was experimentally proved to be a promising technique emerging in the field of forensic applications, specifically, questioned documents despite they were from the same source or different source. However, the call for newly improved data analysis is unlimited and the need to know if the used ink has the same principal components or not. <br /> Methods: In the present work, the application of PCA has been demonstrated as statistics-based spectral analysis of the output resultant LIBS spectra for the forensic questioned documents analysis. The LIBS spectra were acquired from IR laser induced plasmas of black ink on regular document paper of ten brands of black gel inks commercially available in the Egyptian market. The idea behind principal component analysis based on the loadings for the first three principal components. The obtained results have been shown to characterize ink pens used in the analysis, however, the first principal component encompass the dominant characterization for the used pens. Conclusions: The results of this study indicate that Laser Induced Breakdown Spectroscopy (LIBS) of ink pens aided with PCA technique can promote the LIBS capability to faster, error-free and automatic elemental identification and differentiation for in-situ forensic purposes, specifically, questioned documents.
Forensic sciences,questioned document,Ink pen characterization,Laser Induced Breakdown Spectroscopy,Principal component analysis
https://ajnsa.journals.ekb.eg/article_28575.html
https://ajnsa.journals.ekb.eg/article_28575_bb60be74274439d991d0b0c355ff6f92.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Effect of α-irradiation of energy 0.5 MeV on hydrogen bonding in a-Si:H and ultrathin layers of a-Si:H/a-Ge:H
79
83
EN
nagwa
abdelmoniem
Faculty of science, tanta university
dr_nagwa_25@hotmail.com
10.21608/ajnsa.2019.4435.1102
Effect of α-irradiation and Ge content for a-Si:H and a-Si:H/a-Ge:H with different layer films is studied on infrared (IR) spectra. The integrated intensity of the oscillator strength of Si-H and Ge-H vibrations is determined. It is found that the integrated intensities of IR vibrational bands are enhanced significantly after the bombardment by 0.5 MeV α-particles. These observations are explained in terms of the change in the oscillation strengths of the vibrational modes induced by defects created near the vibration complex during bombardment. The results reveal that the effect of Ge content on the infrared spectra before and after irradiated films by α-particles of energy 125KeV/n. The defects were created by bombardments induce an increase in the oscillator strengths for some of Si-H and Ge-H vibrations due to decrease in the refractive index . The dangling bonds were formed in the range 2700-3100cm-1 in a-Si:H/a-Ge:H in attributed to the presence of OH groups or due to the preferential attachment of hydrogen and deuterium to Si atoms rather than the Ge ones. The irradiated a-Si:H/a-Ge:H lead to decrease the absorption band due to increase the hydrogen content bonded to Ge atoms, therefore the disorder is decreased and the crystalline state is increased.
a-Si:H/a-Ge:H ultrathin layers,hydrogen bonding in a-Si:H,α-irradiation
https://ajnsa.journals.ekb.eg/article_28576.html
https://ajnsa.journals.ekb.eg/article_28576_dc691cffbbc32e22c1b711050f3002ad.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Relation between Anti-Müllerian Hormone with Antral Follicle Count and Ovarian Volume in Polycystic Ovary Syndrome
84
93
EN
Hanan
Youssef
Health Radiation Research Department, NCRRT, Atomic Energy Authority, Ahmed El-zomor street, Nasr City, Cairo, Egypt
hanangabr62@gmail.com
Elham
Sayed
Marei
Health Radiation Research Department
elhammarei@yahoo.com
10.21608/ajnsa.2019.3711.1087
Abstract<br /> Polycystic ovary syndrome (PCOS) is the most common endocrinopathy in women during reproductive age, Women with PCOS show raised Anti-Müllerian hormone (AMH) levels, due to increased number of small antral follicles and granulosa cells, and these may lead to anovulation. Measuring antral follicle count (AFC) and ovarian volume (OV) by ultrasound give insight to the ovarian function. This study was done to investigate the relation between AMH with AFC, OV and different biochemical parameters which determine PCOS. This study was carried out on thirty patients with PCOS as (group 1) compared with fifteen healthy women as control group (group 2). AMH, FBS, Insulin, HOMA/IR, Testosterone, cholesterol, Triglycerides (TG), body mass index (BMI) and hirsutism were measured for all women in both groups. The results revealed that serum level of AMH is significantly higher in PCOS (11.90±4.23ng/ml) than control group (4.36±0.56ng/ml). As regards AFC, there is high significant increase (26.10± 5.49 follicles) in PCOS group versus (9.07 ±1.83 follicles) in control group. Furthermore, the results revealed high significant difference in OV (11.20±2.78ml) in PCOS compared to (6.23±0.73ml) in control. There is significant correlation between AMH, AFC and OV in PCOS, There is high significant correlation between AMH, AFC, OV, BMI testosterone, HOMA/IR, HDL, cholesterol, and TG in both groups. We conclude that there is a tight positive correlation between AMH and AFC and OV.
AMH,AFC,OV,PCOs
https://ajnsa.journals.ekb.eg/article_28964.html
https://ajnsa.journals.ekb.eg/article_28964_542031ed50f54b8d41efd10d1449cfb6.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Purification and studying some characters of laccase enzyme from irradiated Pleurotus ostreatus ATCC 56270
94
102
EN
ola
ahmad
haggar
microbiology, Faculity of science El-azher university
olaseif20@yahoo.com
10.21608/ajnsa.2019.3804.1090
Purification of laccase enzyme by anion exchange chromatography using DEAE sepharose and sephacryl HR are successful in purifying laccase. The molecular weight of laccase was 75 KDa determined by SDS- PAGE. The optimum pH for activity was 5 and for stability was (6.5-7.5), the optimum temperature for activity was 35oC and stability of the enzyme was stable up to 55oC, the enzyme retained 100% of its activity after 20 minutes incubation, 85% of its activity after 1h incubation at the same temperature. The energy of activation (Eact) of the purified laccase between 20oC and 45oC at its optimum pH was 16.3 k Jmol-1. The apparent Km value of the enzyme for ABTS was estimated to be 1.4 mM under standard assay conditions, kcat value of ABTS was calculated to be 3450 min-1, Vmax is the maximum initial rate in the Michaelis- Menten equation (1.2 µmol L-1 min -1).Microencapsulation of laccase was exhibited that free laccase (35U/ml) has higher activity than encapsulated laccase (24.3 U/ml).
: Laccase,Pleurotus ostreatus,Purification,properties,Microencapsulation
https://ajnsa.journals.ekb.eg/article_28965.html
https://ajnsa.journals.ekb.eg/article_28965_d4571d2b48e093d153f8d23335ce850b.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Microstructure, creep deformation behavior and reliability of Sn-6.5wt%Zn-0.3wt%Cu lead free solder after Bi additions
103
111
EN
E.
H.
El-Khawas
Higher Technological Institute 10th of Ramadan city
enash12@hotmail.com
10.21608/ajnsa.2019.4731.1109
Creep characteristics of Sn-6.5Zn-0.3Cu plain solder was studied and compared with Sn-6.5Zn-0.3Cu-1Bi and Sn-6.5Zn-0.3Cu-3Bi solder alloys. The results show that 3Bi-containing alloy solder has the higher creep resistance (~80 times) than the other two solders at the same stress level and testing temperatures. The higher creep resistance was attributed to the solid solution and precipitations strengthen effects of Bi atoms. The precipitation of Bi atoms or particles can significantly refine the microstructure, blocks the movement of dislocations and increases the creep resistance of Bi-containing solders. Moreover, the creep life time of plain SZC plain solder alloy was extremely enlarged ~23.7 times with the addition of 3 wt. % Bi, which could result in improving the reliability of Bi-containing solders. Additionally, the minimum creep strain rate in the steady state flow is developed during secondary creep and Garofalo model was created from the experimental data to predict the creep deformation mechanism. According to the obtained stress exponents and activation energies, it is proposed that the dominant deformation mechanism is dislocation climb over the whole temperature range investigated.
Sn-6.5Zn solder alloy,Microstructure,tensile creep properties
https://ajnsa.journals.ekb.eg/article_28966.html
https://ajnsa.journals.ekb.eg/article_28966_ee4cbba6b5950aa99cd2576abc0b3216.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Enhancement of electrical and magnetic properties of nanocomposite BaTiO3 - NiZnFe2O4 irradiated by Gamma ray
112
124
EN
Ahmed
Maher
Henaish
Physics Department, Faculty of Science, Tanta University, Egypt
ahmed.henaish@science.tanta.edu.eg
Doaa
Elrefaey
Physics Department, Faculty of Science, Suez Canal University, Egypt
doaaelrefaey76@yahoo.com
Ahmed
Ashour
NCRRT
ashourvip3@hotmail.com
Osama
Hemeda
Physics Department, Faculty of Science, Tanta University, Egypt
omhemeda@yhoo.co.uk
10.21608/ajnsa.2019.3776.1089
The effects of the gamma ray irradiation on the, microstructural and magnetic properties of the composite (1-x) (Ni0.8Zn0.2Fe2O4) + x (BaTiO3) where x = 0%, 20%, 40%, 60%, 80% and 100 %BT content have been investigated. All samples were exposed to gamma radiation dose in range 310 kGy with dose rate 1.4 kGy/h at room temperature using 60Co radioactive source at irradiation cell (medical sterilizer type CM-20). From the X-ray diffraction analysis, it was found obviously that the lattice parameters and average grain size have been affected, for all irradiated samples. The initial permeability at Curie temperature for all samples were sharply decreases after irradiation. The calculated values of diffusion coefficient of Oxygen vacancies, the concentration of Oxygen vacancies and the activation energy of diffusion process were calculated before and after irradiation. From the results we conclude that the material after irradiation can be used for the Gamma ray detection.
Nickel–zinc ferrites,BaTiO3,Nanocomposites,Gamma ray irradiation
https://ajnsa.journals.ekb.eg/article_29184.html
https://ajnsa.journals.ekb.eg/article_29184_a763d9f7602255a4bb8993f8fc9feb5b.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Astrophysical S-Factor for 7Li(P,γ)8Be by Different Sets of Optical Parameters
125
131
EN
Ahmed
Elsayed Adil
Amar
Department of Physics, Faculty of Science, Tanta University
amar.physics@yahoo.com
10.21608/ajnsa.2019.4527.1105
The available experimental data for 7Li(p,p)7Li elastic scattering have been investigated using both optical potential as well as single folding optical potential in which the real part of potential is derived on the basis of single folding model. Approximated optical potential parameters have been obtained for real part using DFPOT code. The real part was normalized and imaginary part was optimized at all range of energies. The calculated normalization factor NR was 0.8. The agreement between experimental data and theoretical calculations has been achieved at the different concerned energies using ECISS88 program. The calculation of astrophysical S-factor for 7Li(p,γ)8Be radiative capture reaction has been performed using potential model. Different sets of optical potential parameters have been used during analysis. It has been found that different potential parameters play a crucial role and has a significant effect on the calculated S-factor. It has been shown that optical parameters have the greatest effect on astrophysical S-factor through our calculation.
Optical potential parameters,normalization factor,astrophysical S-factor
https://ajnsa.journals.ekb.eg/article_29185.html
https://ajnsa.journals.ekb.eg/article_29185_ef742f028a327a7b2d65a23152ea1840.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Assessment of Radiological Hazard Indices in Abu Rusheid area, South Eastern Desert, Egypt, Using Gamma Ray Spectroscopy
132
141
EN
Korany
Korany
0000-0002-3443-7919
Department of Physics, Faculty of Science, Suez University, Egypt
korany81@hotmail.com
Hesham
Yousef
Physics Department, Faculty of Science, Suez University, Suez, Egypt
h_yosef2013@yahoo.com
10.21608/ajnsa.2019.5168.1121
The radiological hazard indices were determined using NaI(Tl) detector for twenty six collected rock samples from Abu Rusheid area, South Eastern Desert, Egypt. The Eastern Desert of Egypt is a source of granitic rocks used for uranium mining and also used as raw materials for building, for that reason cataclastic (mylonitic) rock samlpes were investigated to evaluate the radiation hazard indicators and compare the values of the world average values.The results show that, the distribution of radionuclides activity concentrations in the rock sample varieties affects the values of the absorbed dose rate in the studied rocks to be higher than the worldwide limit that are not safe for human. The average values of the total annual effective dose varied from 3.30 to 7.51 mSvy-1 and the lifetime cancer risk ranged from 2.31to 5.25. From the radiation protection point, the results were found above the worldwide average. These data record the radioactivity background levels in rock samples and could be used as reference information to assess any changes in the radioactivity background level due to different geological processes in the investigated area.
Gamma Ray Spectroscopy,Annual effective dose,Hazard indices,Rock samples
https://ajnsa.journals.ekb.eg/article_29186.html
https://ajnsa.journals.ekb.eg/article_29186_6d8d8da139abc6fa7e75a005f51c7fa8.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Computer-Aided Detection System for Breast Cancer Based on GMM and SVM
142
150
EN
Amany
Abdel Aziz
Arafa
0000-0002-5451-2293
Radiation Engineering Department, National Center for Radiation Research and Technology, Cairo, Egypt
arafa_amany@yahoo.com
Nesma
El-Sokary
Radiation Engineering Department,
National Center for Radiation Research and Technology (NCRRT)
Cairo, Egypt
nesma.elsokkary@gmail.com
Ahmed
Asad
Computer Science Department,
Institute of statistical studies and researches (ISSR),
Cairo University,
Cairo, Egypt
ah_assad@hotmail.com
Hesham
Hefny
Computer Science Department,
Institute of Statistical Studies and Research (ISSR)
Cairo University,
Cairo, Egypt
hehefny@ieee.org
10.21608/ajnsa.2019.7274.1170
Region-of-interest (ROI) segmentation is an important critical step and challenging task in the evolution of computer-aided detection (CAD) system for breast cancer. The discovery of breast cancer in early stages can save many women lives. However, most of the early detection systems are costly in terms of complexity, price and processing time; that make it unsuited for developing countries. The digital mammography is proven to be one of the most important diagnostic techniques for breast cancer tumors. Therefore, this work proposes a CAD system for breast cancer detection from digital mammography based on Gaussian Mixture Model (GMM) followed by Support Vector Machine (SVM). The best contribution of our proposed system is the usage of GMM for the first time in the literature for mammogram images segmentation into ROI areas. Besides, the discrimination between the three classes of tissues as normal, benign or malignant, is used without previous knowledge of mammogram images’ type. Moreover, the proposed system is fully automated in all of its stages with reduced computation compared with recent used methods. Hence, it offers a suitable early detection system to our country regarding moneywise, timewise, and reduced complexity. A non-linear multi-class SVM is used for classifying the ROI into three classes: normal, benign or malignant tissue. The experiments show overall average classification accuracy of 90% for detecting normal, malignant or benign on randomly chosen 90 cases from the benchmark mini-MIAS dataset. On the other hand, the proposed method achieves 92.5% accuracy when classifying the benign from malignant cases.
breast cancer,Diagnosis,CAD system,GMM,EM algorithm,Mammogram,Mini-MIAS,SVM classifier
https://ajnsa.journals.ekb.eg/article_29187.html
https://ajnsa.journals.ekb.eg/article_29187_b0670a53e2c1c5a3e3f81709b20bd5c0.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Selective Separation of Uranium and Thorium Using Mesoporous Modified Nano-Alumina from Abu Rusheid Leach Liquor.
151
161
EN
Abd Allh
Mahrous
Abd El-Hamid
Production sector, Nuclear Materials Authority, Cairo, Egypt
abdallh.abdelhameed@hotmail.com
10.21608/ajnsa.2019.6727.1157
This study interested in the synthesis and modification of mesoporous alumina monoliths in order to be used as a highly sensitive separating material for extraction of both U (IV) and Th (IV) ions selectively from real leach liquors. The adsorbent is prepared through functional immobilization of alumina with 2-Amino-1-thia-3,4-diazole. TEM, N2 adsorption/desorption isotherm; TGA, and elemental analysis were carried out to demonstrate the fabricated mesoporous adsorbent. The optimum adsorption conditions such as pH, time, and initial concentrations were investigated to study the adsorption behavior of the modified alumina for U (VI) and Th (IV). The obtained results demonstrate that, the adsorbent allow extremely efficient adsorption for U (IV) and Th (IV) ions at different pHs from the real matrix (Abu Rusheid, Egypt). The adsorption efficiencies of thorium and uranium are 80 and 85 % respectively. The loaded thorium is eluted firstly by 6M HCl then loaded uranium is eluted by 2 M HNO3. In addition, this study proved that in order to completely separation of U (VI) and Th (IV) from sulfuric acid of Abu Rusheid leach liquor it needs about 3 stages of sequential separation using alumina-ATDZ material.
Mesoporous Materials,Adsorption,Uranium,Thorium,Alumina
https://ajnsa.journals.ekb.eg/article_29188.html
https://ajnsa.journals.ekb.eg/article_29188_9d3aea2cb675cb3609658898e6923cf2.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Characterization of photo-neutrons produced by 150 MeV and 1 GeV electrons impinging on high Z-metallic targets for neutron resonance spectroscopy
162
168
EN
Fatma
Mohamed
Ragab
Faculty of Women, Ain Shams UNI
fatma_zena@yahoo.com
ElTayeb
Elsaady
Uni
e.elsaady@yahoo.com
Hosnia
Abuzeid
UNi
dr.hosnia.abuzeid@gmai.com
Afaf
Nada
UNi
afafhero_nada@yahoo.com
Mustafa
ElAshmawy
Uni
mostafa_ashmawy2002@yahoo.com
10.21608/ajnsa.2019.3755.1088
Monte Carlo calculations have been performed using MCNP code to study the generation, angular distribution and energy spectrum of photo-neutrons for 1 GeV and 150 MeV electron beam energies impinging on different thickness of Tungsten, Tantalum and Lead targets. It is noticed that the photo-neutron yield increases as the target thickness increases then saturates beyond an optimized thickness of the target. Moreover, the photo-neutron yield shows significant increase as the electron energy increases. At the optimized thickness, the angular distribution of photo-neutrons is found almost isotropic for 150 MeV electrons and anisotropic for 1 GeV electrons. Further, by increasing the electron energy and/or the target thickness the angular distribution is found to be forward peaked. The energy spectrum of photo-neutrons can be well described by a Maxwellian distribution for both electron energies. Such calculations can help in developing a photo-neutron source based time of flight facility (TOF) for elemental and isotopic identification via neutron resonance spectroscopy. Photo-neutron yields, angular distribution, mean energy, energy spectrum and nuclear temperature for 1 GeV and 150 MeV electron energies and different target materials are presented.
photo-neutron,angular distribution,Monte Carlo calculations,electron accelerator
https://ajnsa.journals.ekb.eg/article_29302.html
https://ajnsa.journals.ekb.eg/article_29302_6e6b13b6cc420b3da23e151f74a2e0d9.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Estimation of the most Appropriate Threshold for Lesion Delineation and Volumetric Quantification in 18F-FDG PET
169
180
EN
Hesham
Abdel Gawad
Ahmed
Kasr Al Aini center for nuclear medicine and oncology
hesham_ag@yahoo.com
Shaban
Al Ramlawy
Faculty of Medicine Department of Critical Care- Cairo University Hospitals Cairo University, Egypt
shabanwmr@hotmail.com
Magdy
Khalil
Helwan University Department of Physics (Medical Biophysics), Faculty of Science Cairo Egypt
magdy_khalil@hotmail.com
10.21608/ajnsa.2019.3449.1080
Abstract<br /> Purpose<br /> Function formulation to estimate the most appropriate threshold for automatic lesion delineation in PET scan.<br /> Materials and Methods<br /> The phantom consists of two parts: A hollow cylinder with set of spheres. The sphere assembly contains 4 spheres of different volumes. The phantom was filled with water containing 18F-Fluorodeoxyglucose (18F-FDG) forming the sphere versus background activity concentration (μCi/ml) ratios 3:1, 5:1, 8:1, 10:1, 12:1, 14:1 and15:1. Graphs were plotted, of standardized uptake value threshold versus lesion-size at different sphere/background ratio. There was a logarithmic decrease in threshold with an increase in lesion size. The most appropriate SUV threshold for each lesion at different contrast ratio was estimated from the plotted graphs. Four tests were used to generate a 3D general function to estimate threshold using the contrast ratio and lesion volume as inputs and the other three tests were used for the function validation. The Normalized mean square error (NMSE) is used to measure the convergence between estimated and measured data set.<br /> Results<br /> The created logarithmic functions offer an easy and simple way to estimate the percentage value of SUVmax as a threshold using the lesion/background ratio and sphere volume(or Diameter) from CT images as inputs to be used for lesion delineation and volume determination in PET images that was verified and the NMSE=6.2<br /> Conclusion: <br /> The created formula is a useful and easy to estimate the most appropriate SUV threshold for automatically definite lesion volume.
positron emission tomography-computed tomography,standardized uptake value,lesion delineation
https://ajnsa.journals.ekb.eg/article_29303.html
https://ajnsa.journals.ekb.eg/article_29303_0127a2a04952406b03a2aed24f01241f.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
The influence of the gas mixing ratio on some characteristics and reaction rate coefficients of Ar/N2 and He/N2 DC plasma
181
186
EN
Naglaa
Mohammed
El-Sayed
Faculty of Science, Zagazig University, Egypt
nagla68mohammed@gmail.com
omar
farag
farag
0000-0002-6423-7790
Zagazig University, Faculty of Science, Physics Department, Zagazig, Egypt
faragfarag66@yahoo.com
10.21608/ajnsa.2019.4970.1115
The aim of this paper is to analyze the relation between the reaction rate coefficients, hence the production of active species, and the gas mixing ratio in a comparative way between Ar/N2 and He/N2 gaseous mixtures. The Ar and He contributions were from 0 to 100 % at total gas pressure of 0.4 Torr and reduced electric field E/N of 610 Td. Langmuir probe is employed to measure electron temperature. The results showed that, adding Ar to N2 plasma reduced both the discharge operating voltage and the electron temperature. However an opposite action is obtained on Adding He. Also, Ar can induce the dissociation of molecular nitrogen and increase the production of nitrogen atoms however; it has insignificant effect on the nitrogen ionization mechanism. On the other hand He addition enhances the production of N_2^+, N+ and N-atoms through ionization, ionization dissociation and dissociative reaction however it has a decreasing effect on the dissociative recombination mechanism.
DC plasma,ionization,dissociation,Rate coefficients
https://ajnsa.journals.ekb.eg/article_29445.html
https://ajnsa.journals.ekb.eg/article_29445_9cdda2d345deb40ea3449e183a15fd76.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Comparative chemical studies between fixed bed & Dynamic ion exchange techniques for extraction of uranium
187
200
EN
mostafa
mahmoud
AbdelAal
nuclear material authority
fekragp@gmail.com
ahmed
ali
abdel samad
nuclear material authority
a.samd@gmail.com
10.21608/ajnsa.2019.4521.1108
Abstract <br /> Leach solution of uranium from different resources was collected and characterized. Batch method and fixed column recovery of uranium from this leach liquor were carried out. The different parameters affecting the extraction of uranium from its solution using anion exchange resin was applied by using both Batch method and fixed column techniques. By using batch method, about 90% of uranium is extracted from its solution within 15 minutes. However, fixed column method extracted 93% of uranium with longer time by Amberlite IRA400. It’s found that recovery of uranium from small volumes of these leach solution, it preferred to carry out using batch method. Abstract <br /> Leach solution of uranium from different resources was collected and characterized. Batch method and fixed column recovery of uranium from this leach liquor were carried out. The different parameters affecting the extraction of uranium from its solution using anion exchange resin was applied by using both Batch method and fixed column techniques. By using batch method, about 90% of uranium is extracted from its solution within 15 minutes. However, fixed column method extracted 93% of uranium with longer time by Amberlite IRA400. It’s found that recovery of uranium from small volumes of these leach solution, it preferred to carry out using batch method.
Keywords: Fixed bed,Batch method ion exchange technique,Uranium extraction
https://ajnsa.journals.ekb.eg/article_29446.html
https://ajnsa.journals.ekb.eg/article_29446_28eb6b22205f09dd4c38981cd215d3cd.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
New extraction technique of zirconium and hafnium from zircon mineral
201
208
EN
Ahmed
Abd El_Kareem
Nuclear Material Authority
kareemnma@yahoo.com
10.21608/ajnsa.2019.3052.1066
Zirconium and hafnium compounds are widely used in today’s technology. Zirconium or hafnium carbides and borides are high temperature ceramics.The present study concerns primarily with optimizing the extraction of zirconium and hafnium from their naturally occurring mineral, zircon, via a wet chemical process. First , zircon heated with molten sodium hydroxide to form zironate and silicate frit. Simple separation technique of sodium silicate from the zirconate and hafnate sodium was then applied to obtain a silicate-free frit, then the extraction of the zirconium ( IV ) and hafnium ( IV ) basic sulfates from their oxychloride solution leaving almost all other ions soluble in the mother liquor was achieved by adjusting the pH value. The precipitate of zirconium ( IV ) and hafnium ( IV ) basic sulfates was dried, weighed, analyzed and percent of the zirconium and hafnium extracted were found to be 97 % of their original concentration.
Zircon mineral,Zirconium,Hafnium,Sulfate,Wet chemical
https://ajnsa.journals.ekb.eg/article_29447.html
https://ajnsa.journals.ekb.eg/article_29447_67b9e0103fc51bd9e254f872ae1cc94d.pdf
Egyptian Society of Nuclear Sciences and Applications (ESNSA)
Arab Journal of Nuclear Sciences and Applications
1110-0451
2090-4258
52
2
2019
04
01
Preparation And Characterization of Magnetic Nanocomposite Based on Gum Arabic/2-Hydroxyethylmethacrylate Using Gamma Irradiation For Use In Biomedical Application
209
226
EN
Shaimaa
Mohamed
Nasef
0000-0002-5323-0374
Polymer Chemistry Department, National Center for Radiation Research and Technology, Atomic Energy Authority, Nasr City, Cairo, Egypt.
shaimaa.nasef@eaea.org.eg
Naguaa
Badawy
Chemistry Department. Faculty of Science(Girls). Al-azher University, Cairo, Egypt
dr.naguaa@hotmail.com
Fatma
Hafez
Chemistry Department. Faculty of Science(Girls). Al-azher University, Cairo, Egypt
dr.fatma.hafez@hotmail.com
Sabah
Slim
Chemistry Department. Faculty of Science(Girls). Al-azher University, Cairo, Egypt
sabahslim11@gmail.com
Eman
Mohamed
El Nesr
Polymer Chemistry Department, National Center for Radiation Research and Technology, Atomic Energy Authority, Nasr City, Cairo, Egypt.
emanelnesr@yahoo.com
10.21608/ajnsa.2019.4636.1106
Magnetic nanoparticles were prepared from gum arabic (GA), 2-hydroxyethylmethacrylate (HEMA) copolymer hydrogel using gamma irradiation. The factors affecting on the preparation of (GA/HEMA) copolymer hydrogel and the magnetic nanocomposite of (GA/HEMA)-(Fe3O4) such as irradiation dose, copolymer composition, copolymer concentration and magnetite concentration were investigated. The swelling property of the prepared hydrogels was studied and the results showed that the swelling percent increases with increasing PH and reaching equilibrium swelling at 6 h. The obtained hydrogel and its magnetic nanocoposites were characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Scanning electron microscopy (SEM) and Transmission electron microscope (TEM). The presence of Fe3O4 inside the GA/HEMA-Fe3O4 nanocomposites was confirmed by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). Magnetic properties were characterized by Vibrating sample magnetometer (VSM). Finally, the drug loading and in vitro release properties of the (GA/HEMA) copolymer hydrogel and its magnetic nanocomposites were also evaluated using endoxan as an anticancer drug model. The results showed that, the optimum endoxan drug release was 97% from (GA/HEMA)-(Fe3O4) nanocomposite during 210 min. Thus, (GA/HEMA)-(Fe3O4) nanocomposite could be used for localized drug delivery for endoxan drug in neutral environment of the intestine.
Gum Arabic,HEMA,Magnetite (Fe3O4),Nanocomposites,Gamma Irradiation,Endoxan,Drug delivery
https://ajnsa.journals.ekb.eg/article_29448.html
https://ajnsa.journals.ekb.eg/article_29448_c2ef3bb3f59c9d2ce86dc82f5e5572cd.pdf