用MC软件模拟计算LaBr_3(Ce)探测器对MB容器中气态β^+粒子湮灭γ光子的探测效率

Calculation the Efficiencies of LaBr_3(Ce) Detector for γ Ray Produced by Gaseous β^+ Particle Annihilation in MB Beaker by MC Software

用蒙特卡罗软件MCNPX版本模拟计算了同一尺寸的溴化镧探测器对不同体积的MB容器中β+粒子的探测效率和计数率,以及不同尺寸的探测器对同一MB容器、同一探测器在同一体积的MB容器中处于不同深度时对β+粒子的探测效率和计数率,根据计算结果,确定了MB容器的最佳体积和探测器在MB容器中的最佳位置,并和NaI(Tl)探测器模拟的结果进行了比较,结果显示,LaBr3(Ce)探测器对MB容器中β+粒子的探测效率比NaI(Tl)要高。

The paper used the MCNPX software to calculate the efficiencies and counting rate of a same size of LaBr3（Ce） scintillation crystals detector for β＋ particle in different size of MB Beaker,and different size of LaBr3（Ce） scintillation crystals detector for same MB Beaker,and same size of LaBr3（Ce） scintillation crystals detector but in different depth in the same MB Beaker.Based on the result,the optimal volume of MB Beaker and the optimal depth in MB Beaker was assured,then compared with the data attained in analog computation for NaI（Tl）detector,The comparison result shows that the efficiencies of LaBr3（Ce） scintillation crystals detector are more than NaI（Tl）detector.