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γ谱法是测定放射性元素含量的物理方法之一。它是依据欲测对象的特征γ谱,选用谱线强度差异大的能量区间,组合出对应方程式,用标准源预先测定出方程组的系数,通过γ能谱仪的微分测量,得出欲求对象在相应能量区间谱线强度,进而计算其含量。本文根据天然铀系和钍系γ谱的特征能量区间,组成了7个方案,做了比较,着重地研究了样品中有效原子序数和钍铀比值对选用方案分析结果的影响。
Gamma spectrometry is one of the physical methods for the determination of radioactive element content. It is based on the characteristics of the object to be measured γ spectrum, the choice of the energy range of large differences in line intensity, the combination of the corresponding equation, with a standard source of pre-determined coefficient of the equation, by γ spectrometer differential measurement, the desired object Spectral intensity in the corresponding energy range, and then calculate its content. Based on the characteristic energy intervals of natural uranium and thorium γ spectra, seven schemes were made in this paper. The effects of effective atomic number and thorium-uranium ratio in the sample on the analysis results were studied.