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The book represents hand book to provide people with limited scientific knowledge with notes about concepts of gamma irradiation by mean of radiotherapy. It also provide them with simple informations about different types of radioprotectors which obtained from the nature. Recently, the researchers directed to search in the nature for different natural products to resist hazards of the exposure to gamma rays for any purpose.

This book represents deep ideas about equipment used mainly to detect the radioactivity and presence of the radioactive isotopes in the different products consumed by human. This equipment is called as Gas Proportional Counter. The central laboratories which are responsible of analysis of these products contain this equipment. The analysts who use this technique cannot solve some problems due to complications in some details about the instrument. So, we tried to show some of these details to provide the undergraduate students in the scientific colleges with some Knowledge about detection of...