基于石墨球形电离室测量γ射线低空气比释动能率  

Measurement ofγ-Ray Low Air Kerma Rate Based on Graphite Spherical Ionization Chamber

作　　者：黄平 漆成龙[1,3] 董文龙 但玉娟 黄秋[1,2] HUANG Ping;QI Cheng-long;DONC Wen-long;DAN Yu-juan;HUANG Qiu(China Testing Technology Co Ltd,Chengdu Sichuan 610021,China;National Institute of Measurement and Testing Technology,Chengdu Sichuan 610021,China;Chengdu University of Technology,Chengdu Sichuan 610059,China)

机构地区：[1]中测测试科技有限公司,四川成都610021 [2]中国测试技术研究院,四川成都610021 [3]成都理工大学,四川成都610059

出　　处：《核电子学与探测技术》2022年第4期677-682,共6页Nuclear Electronics & Detection Technology

基　　金：四川省科技计划(2020YFG0019)资助。

摘　　要：为解决环境水平剂量仪在低量程段(小于1μGy·h^(-1))还存在部分量值溯源问题,探讨了采用石墨球形电离室测量环境辐射场的低空气比释动能率的方法。构建了低空气比释动能率测量数学模型,利用10 L石墨球形电离室进行标准值测量,并开展了相关参数的不确定度评定分析。^(137)Cs源和^(60)Co源对应的标准值测量结果为0.3382μGy·h^(-1),4.2%(k=2);0.3164μGy·h^(-1),4.1%(k=2)。实验测量结果表明:采用10 L石墨球形电离室测量低空气比释动能率可满足相关标准要求。In order to solve the problem of partial traceability of the environmental level dosimeter in the low range(less than 1μGy·h^(-1)),a graphite spherical ionization chamber was used to measure the low air kerma rate of the environmental radiation field.The mathematical model of low air kerma rate measurement was constructed.The standard value was measured using a 10 L graphite spherical ionization chamber,and the uncertainty evaluation and analysis of related parameters were carried out.The corresponding standard values of ^(137)Cs source and^(60)Co source were measured as 0.3382μGy·h^(-1),4.2%(k=2);0.3164μGy·h^(-1),4.1%(k=2).The experimental measurement results show that the measurement of low air kerma rate using a 10 L graphite spherical ion chamber can meet the requirements of relevant standards.

关 键 词：环境水平剂量仪 石墨球形电离室 低空气比释动能率 标准值测量 不确定度评定 

分 类 号：TB98[一般工业技术—计量学]