航空γ谱探测地层中放射性同位素的Monte Carlo模拟计算  

Monte Carlo simulations of airborne gamma spectrometry of radionuclide in earth

作　　者：方晟[1] 曾志[1] 吴其反[1] 程建平[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第z1期1018-1021,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10575065)

摘　　要：航空γ谱探测的Monte Carlo模拟对于实际航空探测工作的开展有重要的指导意义。采用多子源计算结果加权叠加的办法,计算了大地本底γ谱和埋藏于地层中不同深度的60Co在理想状况下各自对应的航空探测γ谱。计算结果表明:采用多子源加权叠加方法获得的模拟谱与实际航空探测相符较好。在理想状况下,放射性同位素60Co可被探测到的最低相对强度与埋藏深度之间存在半对数线性关系。这一线性关系为实际航空探测60Co时,探测工作条件的选择提供了理论参考。Simulations of the airborne Gamma spectrometry are important guidance for practical airborne Gamma spectrometry survey.This simulation divided the earth into sub-cells and performed a series of simulations with these sub-cells being individual sources.Results of these simulations were added together with appropriate weighting factors.This simulation method was then used to simulate the airborne Gamma spectrometry of the earth and that of 60Co buried in different depths in earth.The simulated Gamma spectrometry of the earth corresponded well with the practically-detected airborne Gamma spectrometry.This study revealed a semi-logarithmic linear relationship between the lower limit of detectable 60Co relative activity normalized by background radioactivity and the depth of the 60Co in the earth.This semi-logarithmic linear relationship can help identify the practical working conditions of the airborne Gamma spectrometry survey for 60Co.

关 键 词：MONTE CARLO方法 航空γ谱探测 放射性核素 

分 类 号：T[一般工业技术]