用便携式γ谱仪测量土壤中天然放射性核素的方法

The method of measuring the activities of natural radiologic nuclide in soil with portable micromultichannel analyzer for gamma spectroscopy

本文介绍了用便携式γ谱仪测量土壤中天然放射性核素的方法,因为从美国进口的MicroNOMAD便携式γ谱仪,原来主要是用在野外高活度剂量存在或发生核事故时放射性核素的测量,要改装成在实验室内测量土壤中低活度的天然核素,难度较大,要做的工作很多。例如:要按此γ谱仪Nal探头的几何形状改装铅室,使样品得以屏敝,降低本底,在原设定条件的基础上调试各种参数等,以满足测量土壤中天然核素活度的需要。

This article indroduced the new method of measuring the activities of radiologic nuclide in soil with portable micromultichannel analyzer for gamma spectroscopy.Come from USA, the instrument was used mainly to measure high dose or measure when the accident was made. We taked the place of this with measuring low doses in laboratory. We have done many works about changing Pb room, dropping the radioactive background, improving all the conditions. We made the efficiency of instrument higher and made all the parameters to optimization.