CAJ | 학술논문

在CT 扫描精确获得HPGe探测器结构尺寸的基础上，用MCNP4C蒙特卡罗程序建立了HPGeγ谱仪计算点源的物理模型；通过对探测器死层尺寸的精确校正，确定了探测器死层厚度为0．38 cm；以点源物理模型和探测器死层校正尺寸为基础，分别计算了60 Co、133 Ba、137 Cs、241 Am和152 Eu标准点源各能量分支的探测效率，并与实验结果比较，计算在59．54～1408．01 keV能量范围内探测效率的最大相对偏差为2．39％，最小相对偏差为0．13％。
재CT 소묘정학획득HPGe탐측기결구척촌적기출상，용MCNP4C몽특잡라정서건립료HPGeγ보의계산점원적물리모형；통과대탐측기사층척촌적정학교정，학정료탐측기사층후도위0．38 cm；이점원물리모형화탐측기사층교정척촌위기출，분별계산료60 Co、133 Ba、137 Cs、241 Am화152 Eu표준점원각능량분지적탐측효솔，병여실험결과비교，계산재59．54～1408．01 keV능량범위내탐측효솔적최대상대편차위2．39％，최소상대편차위0．13％。
On the basis of accurate HPGe detector's size which is obtained by CT scanning , the calculation of point source physical model in HPGe gamma spectrometer is established by using MCNP 4C Monte Carlo code;By means of correcting the detector dead layer , the final dead layer thickness is identified as 0 .38 cm;Based on the point source physical model and the result of detector dead layer correction , detection efficiencies of each energy branch of 60 Co,133 Ba,137 Cs,241 Am and 152 Eu standard point sources are calculated by MCNP 4C, compa-ring with the experimental results , the maximun relative deviation in the 59.54~1 408.01 keV energy range is 2.39%, and the minimum is 0.13%.