外照射个人剂量监测的测量不确定度评定

外照射个人剂量监测数据可作为放射性工作人员受到的职业照射剂量证明,具有法律效力,因此监测数据的准确可靠尤为重要。中核核电运行管理有限公司个人剂量监测中心于2017年先后取得中国计量认证(CMA)认证和放射卫生技术服务机构资质认证双资质,除了中心内部质量保证措施外,还定期参加年度全国放射卫生技术机构检测能力考核。文章基于2019年考核实验结果(合格)进行了数据分析以及测量不确定度评定,各实验组测量结果的相对扩展不确定度均在10%以内,中心外照射监测系统性能良好,确保了监测数据的准确性和可靠性。

Evaluation of measurement uncertainty in external exposure personal dose monitoring

External radiation personal dose monitoring data can be used as the occupational radiation dose certification received by radioactive workers and has the legal effect. Therefore, the accuracy and reliability of personal dose monitoring and measurement data for external irradiation is particularly important. Personal Dose Monitoring Centre in CNNP Nuclear Power Operation and Management Co.Ltd., obtained CMA (China Inspection Body and Laboratory Mandatory Approval) and the qualification of radiological health technical service institution in 2017. In addition to the center’s internal quality control measures, Centre also attends the annual inspection detection capacity assessment of the national radiological technology agency. This paper analysis the measurement data and uncertainty evaluation based on the 2019 capacity assessment experimental results (qualified) of CNNP. The relative extended uncertainty of the measurement results of each experimental group is about 10%, which proves that the external radiation monitoring and measurement system has a good performance, and ensures the accuracy and reliability of the monitoring data of the individual dose monitoring center.