由于地面γ能谱测量所反映的是表层土壤中的情况，因此地表影响因素，如介质的粒度、湿度及环境温度等成为不可忽视的干扰因素。经试验的数据曲线分析表明，介质粒度越大，其γ场降低，衰减率高；而介质的湿度越大，介质对射线的吸收量增高，衰减率增高。选择适当的季节，进行γ能谱测量也是很重要的。 Since the measurement of surface γ-ray spectrum reflects the situation in the surface soil, the surface influencing factors such as the particle size, humidity and ambient temperature of the medium become irreversible interference factors. The experimental data curve analysis shows that the larger the particle size of the medium, the lower the γ field and the higher the attenuation rate. The higher the medium humidity, the higher the medium absorbs the radiation and the higher the decay rate. It is also important to choose the appropriate season for gamma spectrometry.