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利用蒙特卡洛方法计算了NaI(Tl)晶体探测器对MarinelliBeaker容器中β+ 衰变气体衰变后β+粒子湮灭产生的γ的总探测效率。计算中 ,由于考虑了β+ 粒子的湮灭几率与物质密度相关这一因素 ,因而得到了总的γ探测效率高于把γ源看成均匀体源的效率的结论
The total detection efficiency of NaI (Tl) crystal detector for γ emission from β + particle annihilation after β + decay gas decay in MarinelliBeaker vessel was calculated by Monte Carlo method. In the calculation, the conclusion that the total γ detection efficiency is higher than that of the γ source as a homogeneous body source is obtained because of considering the probability of annihilation of the β + particles related to the material density