CAJ | 학술논문

采用蒙特卡罗方法模拟计算光子的探测效率需对高纯锗( HPGe )探测器进行准确的建模.模拟计算研究了HPGe晶体长度对探测效率的影响,并在空间不同的测量位置对放射源进行测量,将模拟计算与实验测量相结合,对探测器晶体的尺寸进行调整,获得了HPGe探测器晶体的模拟计算的准确尺寸,并在122～1332 keV能量范围内对模拟结果进行了验证.结果表明,在此能量范围内HPGe探测器的探测效率的模拟计算值与实验测量值的相对偏差大多数在5%内,并建立点源探测效率与探测器轴向距离的关系.
채용몽특잡라방법모의계산광자적탐측효솔수대고순타( HPGe )탐측기진행준학적건모.모의계산연구료HPGe정체장도대탐측효솔적영향,병재공간불동적측량위치대방사원진행측량,장모의계산여실험측량상결합,대탐측기정체적척촌진행조정,획득료HPGe탐측기정체적모의계산적준학척촌,병재122～1332 keV능량범위내대모의결과진행료험증.결과표명,재차능량범위내HPGe탐측기적탐측효솔적모의계산치여실험측량치적상대편차대다수재5%내,병건립점원탐측효솔여탐측기축향거리적관계.
The accurate shape of HPGe detector is needed in order to calculate its detection e?ciency with Monte Carlo methods. In our calculation, the influence of the HPGe crystal size on e?ciency has been investigated; the final crystal sizes were determined by comparison with experiments and were validated by the experimental e?ciency obtained at several source-to-detector positions. The results show that when the crystal dimensions determined are used to calculate the detection e?ciency in the energy range 122～1 332 keV, the relative deviations between simulated and most experi-mental results were within 5%. In addition, the relationship between detection e?ciency and axial distance to detector was established.