双能γ射线穿透法测定土壤密度和水含量的蒙特卡罗模拟

Monte Carlo Simulation of Soil Density and Water Content by Attenuation of Dual Energy γ Ray

采用蒙特卡罗程序模拟得到241Am、137Cs发出的能量分别为60和662 keV的γ射线对干土和水的质量衰减系数,从而标定土壤密度、水含量与两种射线的透射率的函数表达式。模拟检测表明,由该表达式测量同种干土制备的土壤样品的土壤密度和水含量精确高,可满足实际测量要求。

The present paper focuses on purpose and principle of selecting reference animals and plants, espe cially analyzing and contrasting GRADED（DOE） method and FASSET（EU） method. Both of them are used to evaluating radiation dose rate and irradiation effects of non human species. On this base, the article brings forward what we should carry out and which difficulty to be solved on radiation dose of non human species at the present stage. All the provides research basis of radiological evaluation of non man species in the next stage.