ORIGINAL_ARTICLE
Investigating the sorption behavior of Cesium and cobalt on soil samples.
Two soil samples were collected from El-Dabaa site and denoted as DNS/C (Dabaa natural soil / Calcite) and DNS/Q (Dabaa natural soil / Quartz). They were characterized using X-Ray Fluorescence (XRF) analysis, Fourier transform infrared spectroscopy (FT–IR) analysis and X-Ray diffractometer (XRD) analysis. The soil samples were applied as solid phases for retention of 134Cs and 60Co radionuclides from their aqueous solutions. The effect of different parameters as pH value, contact time, and competing ion on the sorption behavior of 134Cs and 60Co was studied in static conditions. The maximum sorption capacity of DNS/C was 1.16 and 4.28 mg.g-1 for Cs(I) and Co(II) ions, while it was 3.19 and 4.76 mg.g-1 for sorption of both metal ions onto DNS/Q respectively. Different kinetic models were applied to assess the sorption of Cs(I) and Co(II) ions from their aqueous solutions by soil samples. The sorption process followed pseudo-second-order kinetics clarifying that chemisorption could be regarded as the controlling step. The role of temperature on sorption of Cs(I) and Co(II) was studied and the values thermodynamic parameters (∆Ho, ΔGo and ΔSo) were determined. 34Cs radionuclides exhibited ∆Ho values amounted to -14.5416 and -13.0962 kJ.mol-1 for sorption onto DNS/C and DNS/Q samples. These negative values confirmed the exothermic nature of sorption process. The enthalpy change attained the values 25.3895 and 24.67368 kJ.mol-1 for 60Co radionuclide sorption onto the soil samples DNS/C and DNS/Q. These positive values confirmed the endothermic nature of sorption process.
https://ajnsa.journals.ekb.eg/article_110585_5520433806b812b4acd262877657beb1.pdf
2020-10-01
1
12
10.21608/ajnsa.2020.20093.1303
radionuclides
sorption
Kinetics
Soil samples
Reda
Sheha
rsheha68@yahoo.com
1
Nuclear Chemistry Department, Hot laboratories Center, Atomic Energy Authority
LEAD_AUTHOR
Ahmed
Roushdy
lahmed.loda211@gmail.com
2
Helwan Univeristy
AUTHOR
Ehab
Al-Shazly
e_el_shazly@yahoo.com
3
AEA
AUTHOR
Bahaa
Salah
salah1@yahoo.vom
4
Helwan Univeristy
AUTHOR
Abd-Elhakim T. Kandil
Abd-Elhakim T. Kandil
kandil@yahoo.com
5
Helwan Univeristy
AUTHOR
ORIGINAL_ARTICLE
Stresses Induced by LOCA in Steam Generator Collector of VVER1000
During Double End Break Loss of Coolant Accident (DEBLOCA) in VVER1000 reactor, in the first second, pressure waves had been noticed in all points hitting the main components of the primary circuit. Studying the stresses due to DEBLOCA is important to avoid equipment failure. The main attention is focused on the pressure drops on the equipment, because this parameter determines the dynamic loads on the equipment, which can lead to its failure. ATHLET code is used to obtain pressure and temperature variation with time during the accident for the VVER1000 reactor Kalinin-3. The results are used in ANSYS Finite element package to calculate stresses in steam generator collector. The stress just before the emergency (at time 0.014 sec) was 4.3e7 pa and becomes 4.38e6 pa just after the emergency (at time =0.022 second). Fluctuations appear with two peaks of highest amplitude of 1.87e7 and 2.38e7 pa at time of 0.06 and 0.094 sec respectively which is well below the allowable stress. The results indicate safe operation of the equipment.
https://ajnsa.journals.ekb.eg/article_110588_e173f24e9de43adc9d7070e8c91d0bbb.pdf
2020-10-01
13
20
10.21608/ajnsa.2020.22763.1325
VVER1000
LOCA
Steam Generator Collector
stresses
Azza
Hassan
azzaaea@yahoo.com
1
Safety of Nuclear Fuel Cycle Department, Egyptian Nuclear and Radiological Regulatory Authority,Cairo, Egypt
LEAD_AUTHOR
Sergei
Nikonov
niks.ki@mail.ru
2
Department of Theoretical and Experimental Physics of Nuclear Reactors, National Research Nuclear University MEPHI, Moscow, Russia
AUTHOR
Dina
Amer
engineer_dinaali_2009@yahoo.com
3
Nuclear and Radiation Engineering Department, Faculty of Engineering, Alexandria University
AUTHOR
Khaled
Ahmed
atomeng@idsc.net.eg
4
Safety of Nuclear Fuel Cycle Department, Egyptian Nuclear and Radiological Regulatory Authority, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Spatial Cone Beam Computed Tomography (CBCT) Radiological Findings of Florid Cemento- Osseous Dysplasia: Case Report and Review of Literature
Florid cemento-osseous dysplasia (FCOD) is a condition that characteristically affects the jaws of middle-aged black women. Cemento-osseous dysplasia also has been classified to periapical, focal, florid and familial cemento-osseous dysplasia. Radiographically, FCOD appears as well defined radiopaque, symmetrical mass lobules, located in the apical part of the teeth with encapsulated margin. Cone-Beam Computed Tomography (CBCT) is a clinical application of ionizing radiation. CBCT is widely used in dental and maxillofacial imaging. This technology has been used for diagnosis and treatment planning for both adult and pediatric patients in orthodontics. It is advantageous being reconstructed in three dimensions, image quality, a 1: 1 ratio that allowed reliable dimensions, the possibility for craniofacial imagining, and lower radiation doses compared to traditional CT.CBCT is beneficial in diagnosis of this lesion with perfect evaluation of the effect on the surrounding structures. This paper presents two cases of black female patients who were radiographically diagnosed with FCOD
https://ajnsa.journals.ekb.eg/article_110589_12f228e3dec1d97cbbda470a7f6e70c3.pdf
2020-10-01
21
25
10.21608/ajnsa.2020.25704.1336
cemento-osseous dysplasia
Cone-beam computed tomography
focal cemento-osseous dysplasia
periapical cemento-osseous dysplasia
florid cemento-osseous dysplasia
Radwa
Sallam
radwasallam36@gmail.com
1
National center of Radiation research and Technology
LEAD_AUTHOR
ORIGINAL_ARTICLE
Ameliorative effect of vitamin E against radiofrequency radiation emitted from mobile phone-induced hematological and histopathological alterations in male albino mice
Abstract Radiofrequency radiation is widespread in the surrounding environment and their frequent sources are mobile phones. Consequently, the present research was aimed to study the effect of radiofrequency radiation released from mobile phones on some hematological parameters (RBC, HB, MCV, MCH, MCHC, WBC, P LT, LYM %) and histopathological changes in male white mice. In this work, forty adult male albino mice (25-30 gm weight) divided into four equal groups; A, B, C, and D. Group A was used as a negative control group, Group B used as a negative control group for vitamin E solution, group C was exposed to EMR for 2hr ⁄day for 3 weeks without vitamin E and Group D, treated with Vitamin E solution and exposed to EMR for 2hr ⁄day for 3 weeks. The obtained results revealed that significant changes in RBCs, Hb, HCT, MCV, MCHC, PLT, and WBCs were observed in group C. Additionally, variable histopathological alterations in the liver, kidney, lung, heart, spleen, and brain post-exposure to mobile phone radiation were also demonstrated. Vitamin E has improved these harmful effects induced by radiofrequency radiation on different investigated tissues via their capacity to decline the pathological alterations demonstrated in these organs post-exposure to mobile phone radiation as well as via improving different evaluated blood parameters. Consequently, we could conclude that, vitamin E was able extensively to reduce the harmful influences of mobile phone radiation on blood parameters and the histopathological changes in the liver, kidney, lung, heart, spleen and brain tissues.
https://ajnsa.journals.ekb.eg/article_110590_23998c7a2416791c713e51006bade9be.pdf
2020-10-01
26
38
10.21608/ajnsa.2020.25996.1339
Keywords: Mobile phone radiation
Vitamin E
hematological parameters
histopathology
Mona
Ibraheim
mhmekky@yahoo.com
1
Department of Physics, Faculty of Science, Zagazig University, Egypt
LEAD_AUTHOR
Aziza
amin
aziza.amin@fvtm.bu.edu.eg
2
Department of Pathology, Faculty of Veterinary Medicine, Benha University, Egypt
AUTHOR
ORIGINAL_ARTICLE
Anti-Tumor Effect of Green Tea Extract, Simvastatin and Gamma Radiation on Solid Tumor in Mice
The current study was conducted of six groups (n=12) to define the efficacy of epigallocatechin gallate, simvastatin and gamma radiation individually or combined together to reduce solid tumor size induced by intramuscular injection of EC cells in the right thigh of the targeted mice. Magnetic resonance imaging device 1.5 Tesla used for radiology imaging of the normal and ascites-bearing mice under anesthesia. The animals with solid tumor were followed up daily for recording deaths, tumor size, rate of inflammation and gangrene in the tumor area of hind limb. Magnetic resonance imaging showed the intraperitoneal ascites and the soft organs (liver, kidney and intestine) which were bright in the case of ascites-bearing mouse than the normal control. Triple therapy regimen significantly reduced the tumor size (662.6±12.5) compared to the positive control (825±21.8) and increased survival rate to 66.7% compared to 25% in the positive control. Triple therapy reduced the inflammation of tumor area, preventing the gangrene incidence, and showed the best value of T/C=142, ILS=42.11 and TIR %=19.6 compared to the positive control and single treatments, so it is considered as an anti-tumor regimen according to the National Cancer Institute criteria.
https://ajnsa.journals.ekb.eg/article_110616_aab782ea59c237945ab9791b8e43d6e5.pdf
2020-10-01
39
52
10.21608/ajnsa.2020.22827.1322
Solid Tumor
Green tea extract
Simvastatin
gamma radiation
MRI
Combination therapy
Ibrahim
Abdelrahman
ebtalah@gmail.com
1
Radiation Biology Department, National Center for Radiation Research and Technology
LEAD_AUTHOR
Hussein
El-Kashef
hussein_elkashef2010@yahoo.com
2
Egyptian Atomic Energy Authority, National Center for radiation Research and technology, Radiation Biology Department
AUTHOR
Nagwa
Hassan
nagwa.hassan@hotmail.com
3
Zoology department, Faculty of Science, Ain-Shams University
AUTHOR
ORIGINAL_ARTICLE
Ultrastructure deformation of flight muscles and bioenergetics changes in honey bee workers treated with pesticides
Beehives are exposed to the risk of pesticide contamination by honey bee workers who transport polluted pollens and nectar to the hive. This work illustrated the hazardous effects of two pesticides, avermectin (broklen pure) and chlorpyrifos (ictafos) on flight muscles of bee workers, Apis. mellifera. Muscle fibers of insects treated with ictafos appeared more susceptible than treated with broklen pure. They appeared irreversible damage, degeneration, and necrosis of the sarcostyles, sarcosomes, and nuclei after treated with ictafos. While broklen pure s induced some fragmentation of nucleus damage, cellular membranes, and sarcosomes. Additionally, ictafos induced more significant effects on bee workers bioenergetics than broklen pure. It induced not only a significant reduction in gross energy (GE), crude fiber (CF) but also a highly significant reduction in crude protein (CP). However, it induced a highly significant increase in nitrogen-free extracts (NFE) compared with the control. Finally, we recommend prohibiting the use of ictafos as a pesticide in agricultural products.
https://ajnsa.journals.ekb.eg/article_115843_692b06f68ff309cb7453e029cab7c8b2.pdf
2020-10-01
53
63
10.21608/ajnsa.2020.21369.1315
Apis
mellifera
flight
Muscles
Fine
structure
chlorpyrifos
Avermectin
Bioenergetics
Eman
Mahmoud
e.mahmoud11@yahoo.com
1
Biological Applications Dept., Nuclear Research Centre, Atomic Energy Authority
LEAD_AUTHOR
ORIGINAL_ARTICLE
Developing a New Model for Description of Micro Size Particles in SEM Images for Safeguards Purposes
Scanning Electron microscope (SEM) is a fast screening tool for identification of uranium and thorium particles. In the field of micro-particle analysis for safeguards purposes, estimation of uranium size is necessary information especially for scanning of swipes or environmental samples at nuclear facilities. SEM can be used to visualize micro sized particles of any nuclear material. It gives secondary electron images (SEI) at different magnifications power. In this work, the model JEOL 6510 LV instrument that has capabilities to image samples in a range of magnification from X5 to X300,000 was used. The process of imaging was done at optimum conditions; SS=50, WD=10 and appropriate pressure. The system determines the size of any particle in SEI using internal image. Many trials were performed to accomplish a correlation between micro size and pixels to estimate the size of targeted particles. Here, a mathematical model was developed to describe the relation between micro size and pixels depending on an assumption that is called "numbers to zeros" assumption. The mathematical description was manipulated in three different ways; linearly, exponentially and by using artificial neural network (ANN). The model in its three forms was validated using large numbers of SEIs and comparisons with commercial softwares. The fitting correlation coefficient for linear and exponential manipulation was found to be 0.99997 and 1 respectively. While, the performance of the trained data in ANN was 6x10-10.
https://ajnsa.journals.ekb.eg/article_115844_9a93923b753808f916e6d7c6712d0149.pdf
2020-10-01
64
71
10.21608/ajnsa.2020.26198.1340
Micro-particles
SEM images
mathematical model
artificial neural network
Sameh
Shaban
smh_elsaid@yahoo.com
1
Nuclear Safeguards and Physical Protection, Egyptian Nuclear and Radiological Regulatory Authority, Cairo , Egypt
LEAD_AUTHOR
ORIGINAL_ARTICLE
A ROAD MAP FOR NUCLEAR KNOWLEDGE MANAGEMENT PROGRAM FOR REGULATORY BODY
Nuclear Knowledge Management (NKM) is an important pillar for the capacity building program of the regulatory body. It is handled as a long term investment that yields to excellence, effectiveness, and risk management of critical knowledge. Recently, the requirements for optimization and sustainability have led to increased interest in business intelligence and knowledge management domains. In general, the nuclear industry is knowledge-based, as it relies on skilled workers and their know-how. Newcomer countries face common challenges related to brain drain, data overloads, and aging of the qualified workforce that could lead to loss of nuclear knowledge. As a result the need to develop the regulatory practices to ensure that interested parties collaborate, share and manage the evolved nuclear knowledge is significant. This paper discusses the approach applied by the national regulatory body to develop the NKM program as a tool to support the regulatory decision and maintain public trust. It highlights the real practice to improve the interactions between knowledge, organization, culture, processes, and employee's competencies.
https://ajnsa.journals.ekb.eg/article_116074_e06540ca04856649b4b9071751f77562.pdf
2020-10-01
72
80
10.21608/ajnsa.2020.34271.1380
Nuclear Knowledge Management
Regulatory Environment, Integrated Management system, Tacit Knowledge
Organizational culture
Rania
Gomaa
raniagomaa@yahoo.com
1
QA/QC Department,
Egyptian Nuclear and Radiological Regulatory Authority (ENRRA)
Cairo, Egypt
LEAD_AUTHOR
Karim
El Adham
drkarim1964@gmail.com
2
Nuclear Fuel Cycle Department
AUTHOR
ORIGINAL_ARTICLE
Particle size effect of silica gel on the ɤ-radiation induced electrical conductivity of urea aqueous solutions
Different concentrations (0.1, 3, 6 M) of urea aqueous Solutions (UAS) have been irradiated with 60Co- ɤ-rays in the presence of silica gel (SG) with different particle size (0.1-0.5mm) at room temperature. The radiation induced electrical conductivity (RIC) of the irradiated solutions was measured. The RIC values of the 0.1 M solutions increase as the particle size of SG decreases i.e., the particle surface area increases. This observation points to a radiation induced chemical reactions, which are catalyzed by SG. These reactions, probably, yield products, which increase the RIC such as urea peroxide (UP). On the other hand, different behavior was observed in the case of 3, 6 M solutions, where, the RIC increases as particle size increase. So, the mechanism of production of the species which increase the RIC of 0.1 M samples is different than that in the case of 3, 6 M. In all irradiated samples the pH values tend to increase slightly as particle size increases. A mechanism was proposed to explain the obtained data.
https://ajnsa.journals.ekb.eg/article_116228_7497b498aa0c75748beac1fa3fe99811.pdf
2020-10-01
81
87
10.21608/ajnsa.2020.20634.1307
Silica gel
urea
ɤ-Radiation
electrical conductivity
pH
Kh.
Sife-eldeen
sifekhdr@hotmail.com
1
Egyptain atomic energy authority - national center for radiation research and technology
LEAD_AUTHOR
ORIGINAL_ARTICLE
Characterization of the Effect of ɤ-Radiation Absorbed Dose on the Electrical Conductivity of Aqueous Urea Solutions in the Presence of Silica Gel :A Preliminary Dosimetric Study
ɤ-radiolysis of 6M- aqueous urea solutions, in the presence of silica gel (SG), significantly, increases the values of electrical conductivity (RIC) of the solutions, relative to that in the absence of SG. Some dosimetric characteristics were studied, such as the effects of absorbed dose, absorbed dose rate, and post-irradiation storage time on the RIC of the irradiated 6M- aqueous urea solutions in the presence of SG (>0.16mm - 0.2mm). A linear relationship between the RIC of the solutions and the absorbed dose (R2 = 0.998) was observed from 0.240 to 17.670 kGy. The uncertainty in the dose-response function was found to be in the range 0.040-0.320 at 95% confidence level. As dose rate increases the RIC-decreases in the range of 0.298 -1.19 kGy/h. The stability of the response (RIC) of the irradiated solutions is acceptable during post irradiation storage (14 days at 0 oC), where, the response (RIC) decreased at the end of the storage period, 0.49-2.8%%. The effective atomic number of this solution (7.08) was found to be compatible with biological tissues. The results show that the studied system can be considered as a promise dosimeter for low dose applications in the range 0.240 to 17.670 kGy, such as medical and food irradiation.
https://ajnsa.journals.ekb.eg/article_116229_472983b2adc549dbf9e319b622986c3b.pdf
2020-10-01
88
92
10.21608/ajnsa.2020.22233.1320
urea
electrical conductivity
ɤ- Radiation
Silica gel
Kh.
Sife-eldeen
sifekhdr@hotmail.com
1
Egyptain atomic energy authority - national center for radiation research and technology
LEAD_AUTHOR
ORIGINAL_ARTICLE
Characteristics of Dielectric Behavior and AC Electrical Conductivity of Bulk Antimony Sulfide (Sb2S3)
The structural features and morphology of investigated Sb2S3 powder were analyzed by X-ray diffraction and scanning electron microscope techniques. The dependence of dielectric properties and ac conductivity of bulk Sb2S3 as pellet on both of frequency (102–106 Hz) and temperature (303-393 K) were studied. The dielectric constant (121.2-45.8) and dielectric loss (53.3-0.89) displayed noticeable dependence on frequency and in the investigated range of temperature 303-393 K. The frequency dependence of ac conductivity σac(ω) follows up the power relation; σac(ω) = Gωs. The frequency exponent s, diminished with the rise in temperature, implying that the correlated barrier hopping (CBH) is the predominant conduction mechanism. The ac conductivity exhibited a thermally activated nature. The localized states N(EF) values recorded in order of 1018 eV-1.cm-3 at specific temperatures for frequency of 800 Hz. Activation energy ΔE, calculated at different frequencies indicating a decrease from 117 meV to 89 meV with the increase in the frequency.
https://ajnsa.journals.ekb.eg/article_116230_50e020952b2c21060bd8e415b6f05a21.pdf
2020-10-01
93
101
10.21608/ajnsa.2020.27596.1344
Antimony sulfide
AC electrical conductivity
Dielectric properties
Density of localized states
hamed
El-Sayed
hamedezzat@hotmail.com
1
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt.
AUTHOR
Hend
Ali
hend2061@yahoo.com
2
physic department, faculty of education , Ain shams university, Cairo, Egypt
LEAD_AUTHOR
gehan
salem
dgehanfarouk@yahoo.com
3
physics , faculty of Education , Ain shams university, Cairo,Egypt
AUTHOR
Mohamed
Mahmoud
drmohamed.ali@yahoo.com
4
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Replacement of Cobalt in Medical Device Sterilization: Current Trends, Opportunities and Barriers to Adoption of X-ray and E-Beam Within the Medical Device Sterilization Market
Radioactive sources, specifically Co-60, are crucially important to the medical device sterilization industry; however, their benefits must be balanced against the need to ensure that the materials are secure. Accelerator-based sterilization methods, including X-ray and E-Beam, can in many cases sufficiently replace Co-60 and ethylene oxide, the dominant modalities currently in use; however, a lack of hands-on experience with accelerators, regulations, and a lack of capacity have hampered faster adoption of these technologies. The market is likely to change, however, given public pressures against ethylene oxide and concerns over the cost and long-term supply chain robustness of Co-60. This may provide an opportunity for growth for accelerator capabilities. Current research at Sandia National Laboratories and Argonne National Laboratory, on behalf of the Department of Energy’s National Nuclear Security Administration Office of Radiological Security, is focused on developing an understanding of the medical device sterilization marketplace, the different modalities that are used to sterilize goods, and the drivers that affect the actors within it. Research at Pacific Northwest National Laboratory, in conjunction with the medical device sterilization industry, has focused on expanding the industry’s understanding of the capabilities of X-ray sterilization and developing data that can inform the industry’s consideration of a transition towards accelerator-based devices.
https://ajnsa.journals.ekb.eg/article_116231_16bb8b3ed52936a40cb268a8200e836e.pdf
2020-10-01
102
111
10.21608/ajnsa.2020.116231
electron beam
X-ray
Cobalt-60
alternative technologies
medical sterilization
ORIGINAL_ARTICLE
Rheological Assessment of Different Bread Wheat Genotypes Induced via radiation and Hybridization
The study aimed to evaluate the physicochemical and rheological properties of flour samples for six commercial Egyptian bread wheat (two commercial varieties namely Giza-168 and Gemmeiza-11, and four promising lines namely L84, L148, M10, and M34). The sample of M10 which induced/mutated by gamma radiation at dose 350 Gy, showed the best physicochemical and rheological properties, i.e., ash, protein, wet gluten, gluten index, falling number, extraction percentage, and Zeleny value were 0.63, 14.1 %, 36.4 %, 87%, 567 sec., 83.8% and 58 %, respectively. The farinograph parameters water absorption (65.8%), dough development time (11 min) and dough stability (10.8 min) were significantly (P < 0.05) higher in M10 compared to all other samples under study. Furthermore, alveograph parameters showed the highest tenacity (142 mm), dough extensibility (107 mm) and dough deformation energy (499 10-4J). Thus, the promising sample induced via gamma radiation (M10) was the best for parameters in bread making.
https://ajnsa.journals.ekb.eg/article_117011_f533290a6d2ccc8b668caf9bc894d019.pdf
2020-10-01
112
121
10.21608/ajnsa.2020.23450.1326
Bread wheat
rheology
farinograph
Alveograph
radiation mutation
Mohamed
Abdelaleem
abdelrazek_md@yahoo.com
1
Plant research Department ,Nuclear Research Center, Atomic Energy Autoroty
LEAD_AUTHOR
Khaled
Al-azab
alazab_77@yahoo.com
2
Plant Research Department Nuclear Research Center Atomic Energy Authority
AUTHOR
ORIGINAL_ARTICLE
Gamma - Radiation-induced reaction of Sulfuric Acid with Silica gel: A Novel method for the formation of sulfonic acid - functionalized silica (SiO2-SO3H)
Radiation-induced reaction of sulfuric acid with silica gel (SG) was carried out using ɤ-radiation from a 60Co source at room temperature and, its mechanism were suggested. The formation of sulfonated SG (SiO2-SO3H) was confirmed by IR, thermal analysis (TGA/ DSC). Elemental analysis and morphological structure of treated SG (SGtreated) was investigated by scanning electron microscopy (SEM). According to the comparison of the SEM images of SG and SGtreated , it seems that, irradiation of SG in the presence of sulfuric acid leads to partial segmentation of SG particles. The IR spectra of the treated silica (SGtreated) is different from that of the SG. Where, peaks related to the presence of sulfunic group are observed, as well as shifts of SG peaks due to treatment. Also, TGA/ DSC of SGtreated is different from that of SG. Elemental analysis reveals that particle size of SG affects the S/O % value, where SGtreated with >0.16mm - 0.2mm particle size has the maximum value. Also, S/O% value, of >0.16mm - 0.2mm SG particle size, increased, linearly, with absorbed dose up to 80 kGy and then decresedat higher doses.
https://ajnsa.journals.ekb.eg/article_117013_d237a730dc4b88944be5c42ba84f3f0a.pdf
2020-10-01
122
133
10.21608/ajnsa.2020.25092.1333
Silica gel
sulfuric acid
gamma radiation
Sulfonic acid - functionalized silica
Kh.
Sife-eldeen
sifekhdr@hotmail.com
1
Egyptain atomic energy authority - national center for radiation research and technology
LEAD_AUTHOR
Hany
Hosni
ha_hosni@yahoo.com
2
E A E A
AUTHOR
ORIGINAL_ARTICLE
CYANEX 925 As Potential Extractant For the Extraction and Separation of Zirconium (IV) And Niobium (V) From nitric acid Solution
The potential use of CYANEX 925 in kerosene for the extraction and separation of Zirconium (IV) and Niobium (V) from nitric acid solution is explored. The effects of the different parameters affecting the extraction process as extractant, metal, nitric acid and nitrate concentrations as well as temperature were separately investigated. Stripping investigations on the recovery of Zr(IV) and Nb(V) from their loaded organic solutions were also carried out. The obtained results indicate that the extracted metal species are Zr(NO3)4.CYANEX 925 and Nb(OH)2(NO3)3.CYANEX 925 for Zr(IV) and Nb(V), respectively. The difference in the extraction and stripping behavior of the investigated metals indicated that a good separation between Zr(IV) and Nb(V) could be obtained when carrying out the extraction from low nitric acid concentration at low temperature or when using 1M sulphuric acid for stripping 99% of Zr(IV) with nearly no stripping of Nb(V) from the loaded organic solution. The obtained results indicate that CYANEX 925 is a promising extractant for high extraction and separation of Zr(IV) and Nb(V) from nitric acid solution compared with other organophosphorus extractants.
https://ajnsa.journals.ekb.eg/article_117178_c327e0ebbb5c2ab194fe753ea6ea400d.pdf
2020-10-01
134
146
10.21608/ajnsa.2020.27556.1345
: CYANEX925
Zirconium (IV)
Niobium(V)
Nitric acid
Liquid-Liquid extraction
Jacqueline
Daoud
jadaoud@yahoo.com
1
Professor of Radio-Inorganic Chemistry, Chemistry of Nuclear Fuel Department, Hot Laboratories Centre, Atomic Energy Authority
LEAD_AUTHOR
Mohamad
Zeid
m_zeid2002@yahoo.com
2
Chemistry of Nuclear Fuel Department, Hot Laboratories Centre, Atomic Energy Authority
AUTHOR
Mohamad
Ibrahim
mmia_2004@yahoo.com
3
Assistant Professor, Chemistry of Nuclear Fuel department, Hot Laboratories Centre, Atomic Energy Authority
AUTHOR
Hisham
Aly
alydrhisham@yahoo.com
4
Professor of Nuclear Chemistry, Chemistry of Nuclear Fuel department, Hot Laboratories Centre, Atomic Energy Energy Authority
AUTHOR
ORIGINAL_ARTICLE
Effect of Thermal Cycling on Oxidation of Nickel Based Superalloys in Presence of Aggressive Ions
Superalloys are considered as potential candidates to be used in high temperature applications. In the present study, experimental measurements of high temperature oxidation in presence of aggressive ions of Nickel base superalloy (Hastelloy-X) have been carried out at 700°C, 800°C and 900°C for exposure time durations of 1, 3, 5, 10, 20, 50 and 100 hours. The oxidation behavior of superalloy Hastelloy X in the presence of aggressive media, normally, NaCl and Na2SO4 is to identify the surface scales that formed. After oxidation experiments the samples were characterized using Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) to find out the formed phases. The results showed that the major corrosion products formed are Nickel Chromites NiCr2O4 with some Chromium Cobalt Oxide CoCr2O4 spinels in additions to chromium oxide Cr2O3. The obtained results of Hastelloy X were compared with the results achieved previously for Inconel 617. In this study the activation energy of Hastelloy X was estimated and it is Ea = 57.84 KJ/mole.
https://ajnsa.journals.ekb.eg/article_117177_44d1a87621787e4d44f2cfbd5bac4fd5.pdf
2020-10-01
147
154
10.21608/ajnsa.2020.19768.1306
Oxidation
Hot corrosion
Hastelloy X
Inconel 617
SEM
XRD. RD
Gaber
Elawadi
gaberelawdi@yahoo.com
1
Cyclotron Facility, Nuclear Research centre, Atomic Energy Authority
AUTHOR
Salem
Abdel-Samad
salem_abdelsamad@yahoo.com
2
Head of Experimental Nuclear Physics Dept. , Cyclotron Project, Nuclear Research Center, Atomic Energy Authority, Egypt
LEAD_AUTHOR
Ezzat
Elshazly
ezzatelshazly@yahoo.com
3
Metallurgy Department, Nuclear Research Centre, Atomic Energy Authority.
AUTHOR