Document Type : Original Article
Authors
1 Physics department, faculty of science, Helwan university, helwan,egypt
2 Ionizing Radiation Metrology Laboratory, National Institute for Standards (NIS) Giza., Egypt
3 Physics Department, Faculty of Science, Helwan University, Helwan, Egypt.
4 Nuclear material Authority, Cairo, Egypt
5 Physics Department, Faculty of Science, Helwan University, Helwan
Abstract
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