^(37)Ar测量系统的本底降低技术  

Decreasing Background of ^(37)Ar Measurement System

作　　者：向永春[1] 龚建[1] 李伟[1] 卞直上[1] 郝樊华[1] 王红侠[1] 王茜[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2009年第5期477-480,共4页Atomic Energy Science and Technology

摘　　要：从放射性本底来源分析了37Ar测量系统的本底组成,采用MCNP程序对改进前及拟改进的屏蔽体的屏蔽效果进行了模拟计算。考虑到本系统的使用场景,重点对屏蔽体结构进行优化设计,并完成了加工,对改进后的测量系统进行了本底测量实验。实验结果表明:改进后,测量系统的本底降低到改进前的75%,并与理论计算结果相一致,进一步提高了37Ar的探测灵敏度。The background components of the ^37Ar measurement system were analyzed from their radioactive origins. Both the backgrounds of the previous shield and the new improved one were calculated by MCNP code. According to the scene of using the ^37Ar measurement system, the main work was focused on optimizing its structure and machining. The background of the improved shield falls to 75 ~ that of the previous one. The test results are consistent with the calculated results. So the detection sensitivity of the ^37 Ar measurement system is increased further.

关 键 词：37Ar 本底 屏蔽体 现场视察 

分 类 号：O571.32[理学—粒子物理与原子核物理]