原子能科学技术Issue(7)：1153-1158,6.DOI:10.7538/yzk.2015.49.07.1153
基于石墨圆饼电离室的60 Co γ射线空气比释动能的绝对测量研究
Absolute Measurement of Air Kerma by Graphite Pancake Ionization Chamber Exposed to 60 Co Gamma Ray
摘要
Abstract
A pancake ionization chamber made by graphite ,with volume of 6.981 6 cm3 , was fabricated to absolutely measure the air kerma for 60Co gamma ray .The current acquisition system was used to collect the current signals of the ionization chamber in the field of 50 TBq 60Co gamma ray irradiator of the National Institute of Metrology .The physical parameters and the correction items were obtained by experiment measurement or Monte Carlo simulation .The combined standard uncertainty of the device to measure the air kerma for 60 Co gamma ray is 0.24% .A comparison between the pancake ioniza‐tion chamber system and the spherical‐cylindrical ionization chamber primary standards for air kerma was made .The comparison results expressed as a ratio of 60Co gamma ray air kerma ,with value of 0.998 7 ,is accordant with the combined standard uncertainty o f 0. 23% .关键词
空气比释动能/圆饼电离室/蒙特卡罗模拟/绝对测量Key words
air kerma/pancake ionization chamber/Monte Carlo simulation/absolute measurement分类
数理科学引用本文复制引用
李涛,王坤,杨小元,樊铁栓..基于石墨圆饼电离室的60 Co γ射线空气比释动能的绝对测量研究[J].原子能科学技术,2015,(7):1153-1158,6.基金项目
国家科技支撑计划资助项目 （）
