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本项目拟研制数字化放射性气体活度符合测量装置,采用NaI(Tl)晶体作为γ射线探测器,内充气正比计数管作为β射线探测器。放射性气体充于正比计数管内,正比计数管置于NaI(Tl)晶体中。对采用环形NaI(Tl)结构和井型NaI(Tl)结构的组合探测器效率进行模拟计算,计算结果列于表1。其中,γ射线的能量为81 keV,计算效率为81 keV全能峰的效率。内充气正比计数管材料为紫铜,壁厚为1.65 mm。从计算结果可看出,
This project intends to develop a digital radioactive gas activity measurement device, using NaI (Tl) crystal as a gamma-ray detector and an inflatable proportional counter tube as a beta-ray detector. Radioactive gas filled in the proportional counter tube, proportional counter tube placed in NaI (Tl) crystal. The efficiency of a combined detector with a circular NaI (Tl) structure and a well NaI (Tl) structure was simulated and the results are given in Table 1. Among them, the energy of γ-ray is 81 keV, and the efficiency of all-around peak of 81 keV is calculated. Inflation proportional counter tube material is copper, the wall thickness of 1.65 mm. As can be seen from the calculation results,