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J Radiat Prot > Volume 27(4); 2002 > Article
Journal of Radiation Protection 2002;27(4):199-205.
0.412 MeV 감마선에 내한 원주형 Nal(Tl) 섬광체의 총 절대검출효율 계산
홍권표, 신희성, 이상윤, 노성기
Total Absolute Detection Efficiency Calculations of a Cylindrical NaI(Tl) Crystal for the 0.412 MeV γ-rays
Kwon-Pyo Hong, Hee-Sung Shin, Sang-Yun Lee, Seung-Gy Ro
Korea Atomic Energy Research Institute
Received: April 8, 2002;  Accepted: December 13, 2002.
Total absolute detection efficiencies of a 7.62 cm(dia.) and 7.62 cm(height) cylindrical NaHTl) crystal have been calculated for 0.412 MeV γ -rays from a source(point, circular disk, square and line type). In this calculation the linear energy-absorption coefficients based on Hubbell's data have been considered and then calculated total absolute detection efficiencies compared with those from Grosjean and Bossaert. Besides, the source axis-to-detector axis shift distance whid, could give rise to about 0.05 % deviation in the total absolute detection efficiencies has been calculated for a line-type source of 0.5 cm in its length when a source-to-detector distance is 5 cm. It is revealed that the total absolute detection efficiencies obtained in this study are considerably different from those of Grosjean and Bossaert. In addition it is found that the deviation induced due to an imperfect center of a iine ·type source may be within 0.05 % if the shifted discrepancy is no larger than 1.74 mm.
Keywords: cylindrical NaI(Tl) crystal, 0.412 MeV γ-ray source(point, circular disk, square and line type), linear energy-absorption coefficient, total absolute detection efficiency, deviation
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