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目的测定铅屏蔽室内氡对全身和肺部计数器测量137Cs和241Am的最小可探测活度的影响程度。方法通过对屏蔽室进行通室外空气降氡。用测氡仪对屏蔽室内的氡浓度进行连续测量,同时测量全身和肺部计数器的本底谱。结果通过实验数据分析表明,通风降氡可以降低全身和肺部计数器测量137Cs和241Am的最小可探测活度14%至23%。结论对屏蔽室通风降氡,能有效地提高全身和肺部计数器的探测性能。
Objective To determine the effect of radon in a lead shield on the minimum detectable activity of 137Cs and 241Am measured by whole body and lung counters. Methods Through the shield room through outdoor air radon. The radon concentration in the shielded room was measured continuously using a radon monitor, while the cephalic spectrum of the whole body and lung counters was measured. Results The experimental data analysis showed that radon lowering of radon can reduce the minimum detectable activity of 137 Cs and 241 Am from systemic and pulmonary counters by 14% to 23%. Conclusions Ventilation and radon reduction in shielded room can effectively improve the detection performance of whole body and lung counter.