CAJ | 학술논문

运用MCNP5程序，建立了基于MIRD数字体模的肺部γ内污染模型以及NaI(Tl)探测器模型，模拟计算了NaI(Tl)探测器对基于MIRD数字体模的肺部γ内污染的探测效率，获得了在多种空间位置上对沉积在肺部的9种能量γ射线的探测效率。模拟结果表明，在不同位置的探测效率并不完全符合人体肺部的解剖学结构，在右下肺位置可获得最高的探测效率，左下肺次之，左上肺最低。在探测器位置固定的情况下，探测效率随能量的增加，有先增高后降低的现象。
운용MCNP5정서，건립료기우MIRD수자체모적폐부γ내오염모형이급NaI(Tl)탐측기모형，모의계산료NaI(Tl)탐측기대기우MIRD수자체모적폐부γ내오염적탐측효솔，획득료재다충공간위치상대침적재폐부적9충능량γ사선적탐측효솔。모의결과표명，재불동위치적탐측효솔병불완전부합인체폐부적해부학결구，재우하폐위치가획득최고적탐측효솔，좌하폐차지，좌상폐최저。재탐측기위치고정적정황하，탐측효솔수능량적증가，유선증고후강저적현상。
In order to obtain detection e?ciencies of nine kinds of gamma rays emitted by isotopes deposited in lungs at various measurement geometry, Monte Carlo N-Particle Transport Code 5 (MCNP5) has been employed to for calculation. The results show that the detection e?ciency in different locations of lung is not completely accord with human body’s anatomy structure. The e?ciency decreases gradually from lower-right lung, to lower-left lung, and then to upper-left lung. When the location of detector is fixed, with the increase of energy, the detection e?ciency rises up firstly and then falls down.