<sup>37</sup>Ar测量系统的本底降低技术

³⁷Ar测量系统的本底降低技术

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。

Abstract: 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 37Ar measurement system is increased further.