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目的探讨热释光个人剂量监测中本底值与MDL值的各种影响因素,合理应用本底值和MDL值。方法按变异系数小于5%的要求选用一种型号的LiF(Mg,Cu,P)探测器,探测器放在剂量计壳内和壳外以及放置在实验室不同位置,放置周期与服务监测的周期一致,按常规测量程序,求出本底值和MDL值。结果探测器放置在剂量计壳内与壳外以及剂量计放置在不同位置,对本底值影响明显,而MDL值差别不大。结论实施热释光个人剂量监测时,应依托自身剂量测量系统,测量和计算本底值和MDL值;本底剂量计应将探测器置于剂量计壳内,放置在实验室距离墙、地面尽量远的地方,避免由于建筑和装饰性材料放射水平影响本底值。
Objective To explore various influencing factors of background value and MDL value in the monitoring of personal dose of thermoluminescence, and to rationally apply background value and MDL value. Methods One type of LiF (Mg, Cu, P) detector was chosen according to the requirement that the coefficient of variation was less than 5%. The detector was placed inside and outside the dosimeter housing and at different locations in the laboratory. The placement period and service monitoring Cycle consistent, according to conventional measurement procedures, to find the background value and MDL value. Results The detector placed in the dosimeter housing and outside the housing and dosimeter placed in different positions, the impact of the background value significantly, while the MDL value difference is not large. Conclusion In the implementation of thermoluminescence personal dose monitoring, it should rely on its own dose measurement system to measure and calculate the background and MDL values; background dosimeter should be placed in the dosimeter housing, placed in the laboratory from the wall, the ground As far as possible to avoid the background value due to radiation levels of building and decorative materials.