CAJ | 학술논문

目的建立探测器的无源效率刻度方法 .方法利用137Cs点源,对HPGe和NaI晶体尺寸进行调整以获得正确的探测器几何参数,基于BOMAB体模的数学模型,在γ线能量126～1836 keV范围内,采用蒙特卡罗方法 ,结合核应急情况下体内核索探测几何模式,分别计算了HPGe探测器和NaI探测器对BOMAB体模的计数效率,根据计算结果拟合出相关的效率曲线和函数.结果通过拟合函数计算获得的探测效率与应用蒙特卡罗算法得到的探测效率一致性较好.对于Nal探测器,残差为-19%～18%;对于HPGe探测器,残差为-11%～17%.结论根据BOMAB体模的数学模型应用蒙特卡罗方法对便携式γ谱仪进行无源刻度省时、省力,具有较强的可操作性,是一种非常方便的谱仪校准方法 .
목적 건립탐측기적무원효솔각도방법 .방법 이용137Cs점원,대HPGe화NaI정체척촌진행조정이획득정학적탐측기궤하삼수,기우BOMAB체모적수학모형,재γ선능량126～1836 keV범위내,채용몽특잡라방법 ,결합핵응급정황하체내핵색탐측궤하모식,분별계산료HPGe탐측기화NaI탐측기대BOMAB체모적계수효솔,근거계산결과 의합출상관적효솔곡선화함수.결과 통과의합함수계산획득적탐측효솔여응용몽특잡라산법득도적탐측효솔일치성교호.대우Nal탐측기,잔차위-19%～18%;대우HPGe탐측기,잔차위-11%～17%.결론 근거BOMAB체모적수학모형응용몽특잡라방법 대편휴식γ보의진행무원각도성시、성력,구유교강적가조작성,시일충비상방편적보의교준방법 .
Objective To establish an efficiency calibration method without a radioactive source for Inspector 2000 gamma spectroscopy system.Methods At the fwst step,geometry parameters of the detector were properly specified by comparisons of FEPE(Full Energy Peak Efficiency)between Monte Carlo(MC)calculations and the average measured values of HPGe and NaI detectors using point sources(137 Cs).The differences between calculations and measurements were generally within ±10% for gamma rays.Then,Monte Carlo simulation was used to evaluate the counting efficiency of Nal(TI)and HPGe detectors for BOMAB phantoms.Corresponding efficiency curves and functions were fitted.Results The counting efficiency received from the fitted efficiency functions had a good agreement with those from MC simulation.The bias for Nal detector ranged from-19% to 18%,while the bias for HPGe detector ranged from-11% to 17%.The above errors were totally acceptable in the on-site deployment during nuclear and radiological emergency events.Conclusions Monte Carlo method is simple,time and laborsaving in determing the counting efficiency of gamma spectroscopy system.