放射性元素在近地表岩石中的富集,能够在低空造成γ场异常。在对放射性矿床进行航空普查时,γ场异常是最初的观测对象。但是由于多种原因使获得有关异常地质情况及其有关结构的查料复杂化了,其中包括γ场的统计性质。在给定的γ场测量时间情况下,有用讯号的计数率n_g愈低和底数计数率n_φ愈高,统计误差就愈大。辐射仪的探测器所记录γ量子计数率与按记录纸带所测定的脉冲计数率之间的关系以下列方 The enrichment of radioactive elements in near-surface rocks can cause γ-field anomalies at low altitudes. In aerial census of radioactive deposits, γ field anomaly is the first observation object. However, access to information on the abnormal geology and its associated structure has been complicated for a number of reasons, including the statistical nature of the gamma field. For a given γ field measurement time, the lower the count rate n_g of useful signals and the higher the base count rate n_φ, the greater the statistical error. The relation between the γ quantum count rate recorded by the detector of the radiometer and the pulse count rate measured by the recording paper tape is expressed by the following equation