基于核径迹技术的中子个人剂量不确定度评定

发布时间：2018-10-17 18:55

【摘要】：中子个人剂量测量不确定度是个人剂量检测报告的重要组成部分,用于评估职业人员中子个人剂量测量的可靠性和测量结果的可信程度.结合固体核径迹技术监测工作人员中子个人剂量的实际情况,建立数学模型,分析中子剂量刻度曲线、剂量计计数、系统测量重复性、能量依赖性及径迹蚀刻条件等监测过程中不确定度的来源,计算出合成标准不确定度和相对扩展不确定度.评定中子个人剂量不确定度,保证量值测量的准确性,关系到工作人员的职业和健康安全.结果表明,应用固体核径迹技术监测职业人员1个季度的中子个人剂量为0.18±0.05 m Sv,相对扩展不确定度为28%(k=2);提示应关注中子剂量刻度曲线、系统测量重复性及能量依赖性等不确定度的主要来源.将不确定评定方法应用于中子剂量测量实践,可为国内中子监测规范的制定提供一些基础依据.
[Abstract]:The uncertainty of individual neutron dose measurement is an important part of individual dose measurement report. It is used to evaluate the reliability of neutron personal dose measurement and the reliability of the measured results. Combined with solid state nuclear track technology to monitor the actual situation of individual neutron dose of workers, a mathematical model was established. The calibration curve of neutron dose, dosimeter count and repeatability of systematic measurement were analyzed. The sources of uncertainty in the monitoring process such as energy dependence and track etching conditions are used to calculate the synthetic standard uncertainty and relative spread uncertainty. To evaluate the uncertainty of neutron individual dose and to ensure the accuracy of the measurement are related to the occupational and health safety of the staff. The results show that the relative extended uncertainty of neutron dose of 0.18 卤0. 05 m Sv, per quarter is 28% (KG 2), suggesting that attention should be paid to the neutron dose calibration curve. The main sources of uncertainty are repeatability and energy dependence. The application of uncertainty assessment method to neutron dose measurement can provide some basis for the formulation of neutron monitoring standards in China.
【作者单位】：中国医学科学院北京协和医学院放射医学研究所;北京市化工职业病防治院;
【基金】：国家自然科学基金面上项目(81272511) 天津市自然科学基金(11JCYBJC13700) 中国医学科学院、北京协和医学院“中央级公益性科研院所基本科研业务费”(2016ZX310074) 协和青年基金(3332015070,3332015101)
【分类号】：R144.1

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