Determination of total cross section and buildup factor of coal for Cs-137 and Co-60 gamma rays
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Date
1976
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Publisher
Turkish Atomic Energy Commission, Ankara Nuclear Research and Traning Center
Abstract
Kömür’ün Cs-137 ve Co-60 gamaları için toplam tesir kesiti, deneysel ve teorik olarak tayin edilmiştir. Deneysel ve teorik değerler arasında 6 % farklılık bulunmuştur. Toplam tesir kesiti çeşitli kömür kalınlıkları için ölçülen tüm-enerji pik alanları oranından yararlanılarak ölçülmüştür. 0-80 mg/mm2 arasındaki kalınlıklar için number- buildup faktörü, saçılmış ve saçılmamış foton sayısının saçılmamış foton sayısına oranından elde edilmiştir. Ca’un çeşitli foton enerjisi için µx’e bağımlı dose-buildup faktörü eğrileri kömür’ün dose-buildup faktörünün elde edilmesinde kullanılmıştır.
The total cross sections of coal for Cs-137 and Co-60 gamma rays have been determined theoretically and experimentaly. The differences between the experimental and theoretical results were found about 6 %. The total cross sections were measured by means of the ratios of the full energy peak areas which correspond to the different thicknesses of coal. The number buildup factors for the thickness range of 0-80 mg/mm2 have been determined as the ratio of the counts of scattered and unscattered photons to the count of unscattered photons. The determination of effective atomic number for coal has been found by using the effective - Z -method [2-3]. The curves for the dose buildup factor of Ca versus µx for various photon energy have been used to find the dose buildup factor of coal.
The total cross sections of coal for Cs-137 and Co-60 gamma rays have been determined theoretically and experimentaly. The differences between the experimental and theoretical results were found about 6 %. The total cross sections were measured by means of the ratios of the full energy peak areas which correspond to the different thicknesses of coal. The number buildup factors for the thickness range of 0-80 mg/mm2 have been determined as the ratio of the counts of scattered and unscattered photons to the count of unscattered photons. The determination of effective atomic number for coal has been found by using the effective - Z -method [2-3]. The curves for the dose buildup factor of Ca versus µx for various photon energy have been used to find the dose buildup factor of coal.
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Keywords
Gamma rays, Gama ışınları, Coal, Kömür, Total cross section, Toplam kesit, Buildup factor, Birikim faktörü, Determination, Belirleme, Cs-137, Co-60
Citation
Özdemir, Ü. ve Özmutlu, C. (1976). Determination of total cross section and buildup factor of coal for Cs-137 and Co-60 gamma rays. Technical Journal, 3(1), 8-16.