CR39中子个人剂量监测的不确定度评定  

Determination and analysis of uncertainty for individual neutron dose monitoring using CR39

作　　者：曹磊[1] 邓君[1] 刘运宏[1] 张贵英[2] 王芳[3] 周宁 郭文[1] 胡爱英[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088 [2]中国原子能科学研究院 [3]湖北省疾病预防控制中心 [4]江西省职业病防治研究院

出　　处：《中华放射医学与防护杂志》2014年第3期215-218,共4页Chinese Journal of Radiological Medicine and Protection

基　　金：科研院所技术开发研究专项基金（2012EG150137）

摘　　要：目的 通过对CR39中子个人剂量监测的不确定度评定,定量分析中子个人监测结果的可靠性,提高中子个人剂量监测的质量水平.方法 建立适当数学模型,通过对个人剂量计各个环节因素引入不确定度的计算,评定CR39中子个人剂量监测的扩展不确定度.结果 中子个人监测的A类不确定度主要来自测量值和本底,测量值为A类不确定度的最大分量,为11.68％.引入B类不确定度主要为能量响应为7.85％、剂量线性检验为4.0％、距离响应为1.68％和蚀刻条件为3.0％等.相对扩展不确定度约为32％,k=2.结论 放射性同位素场所不确定度评定中,对于某一较小能量范围的中子（即中子的能量分群）,应采用符合其能量响应特性的中子探测器.Objective To improve the quality of measurement of individual neutron dose and quantify reliability of result through determining the uncertainty of individual neutron dose monitoring using CR39. Methods The uncertainty of measurement of individual neutron dose using CR39 was determined by establishing mathematic model and calculating uncertainty introduced by detector reading. Results Type A uncertainty mainly comeed from measuring values and background, with the maximum component of about 11.68%. While type B uncertainty was about 7.85% from energy response, 4.0% from dose linearity, 1.68% from distance response and 3.0% from ecthing conditions respectively. In addition, energy response of detector contributes mostly to type B uncertainty. In present work, the relative uncertainty was 32% with k = 2. Conclusions In the evaluation of uncertainty for radioisotope workplace, it is the right means to choose certain type neutron detector for the neutrons within narrow energy spectrum （neutron energy grouping） to reduce the introduction of uncertainty.

关 键 词：CR39 中子个人剂量监测 不确定度 扩展不确定度 

分 类 号：R818[医药卫生—放射医学]