热释光剂量测量系统检定的质量保证及刻度因子的应用  

Quality assurance for verification of thermoluminescence dosimetry system and application of calibration factors

作　　者：李秀芹[1] 赵进沛[1] 米宁[2] 杨新芳[1] 侯金兵[3] 

机构地区：[1]中国人民解放军北京军区疾病预防控制中心卫生防护科,北京市100042 [2]白求恩医务士官学校 [3]中国原子能科学研究院

出　　处：《职业与健康》2012年第18期2191-2193,共3页Occupation and Health

摘　　要：目的为保证辐射受照人员个人剂量监测数据的可靠性,探讨热释光剂量测量系统检定过程影响因素,计算线性和不同能响刻度因子,确定不同类别照射群体所使用的刻度因子。方法依据标准JJG 593-2006,设计2种方案进行系统检定。方案1:已筛选退火后的探测器片放于有机玻璃平衡板中,分别予以不同剂量的137Csγ射线照射;方案2:将探测器片放于剂量计盒中,置于与方案1相同位置,予γ射线照射和窄谱过滤X射线照射。计算线性和刻度因子。结果直接照射探测器片与将探测器片放于剂量计壳中照射刻度因子差异以及不同辐射能量响应刻度因子差异均具有统计学意义。结论热释光剂量测量系统检定时应严格控制平衡条件,带剂量计盒平衡。对于放射诊断照射群体,应用低能量刻度因子;对于放射治疗照射群体,应用γ射线照射的刻度因子。2种刻度因子的使用,使监测数据更为准确。[ Objective ] To ensure the reliability of individual dose monitoring data of radiation exposed workers, explore the inlluencing factors during verification process of thermoluminescence （TL） dosimetry system, calculate the linearity and the calibration factors of different energy respond, and determine the calibration factors that were suitable to different types of radiation exposed workers. [ Methods] According to JJG 593-2006, two schemes were designed for verification. Scheme one： the chosen TL detectors were placed directly on the phantom and irradiated by different dosage 137 Cs-γ, ray radiation. Scheme two： the chosen TL detectors were worn by boxes, then placed on the phantom and irradiated by different dosage 137Cs-γ radiation and different energy X rays. The linearity and calibration factors were calculated. [ Results] There was significant difference between the detectors placed directly on the phantom and detectors worn by boxes, and the difference between calibration factors of different energy respond was signifi- cant, too. [ Conclusion] In the course of the verification of TL dosimetry system, the balance condition should be controlled strictly, and it is important to adopt the detector boxes for balance. The low energy X-ray radiation calibration factors should be used in radiation diagnosis group, and the γ-ray radiation calibration factors is suitable to radiation therapy group. The application of two calibration factors can get more accurate monitoring data.

关 键 词：热释光剂量测量系统 检定 质量保证 刻度因子 

分 类 号：R144[医药卫生—公共卫生与预防医学]