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在120米高度上测得的天然伽玛射线由一下列四个源泉产生:宇宙射线、钍和铀的衰变产物以及放射性钾。若紧贴地面飞行,则测得的资料可真实地反映地面伽玛射线的强度。宇宙射线在伽玛能谱成分中占有相当的比重(海平面上710％),它同时又是海拔高度的函数。这个数值应在数据处理时减去。钍的衰变产物和放射性钾不构成大气中的放射源。因此,只要不下雨,通过航测伽玛能谱资料的正确分析,不难求出它们的地表含量。测量的重复性为±2％。测量地面的铀
Natural gamma rays measured at 120 meters are produced from one of four sources: cosmic rays, decay products of thorium and uranium, and radioactive potassium. If you fly close to the ground, then the measured data can truly reflect the intensity of the ground gamma rays. Cosmic rays occupy a significant proportion of the gamma-ray spectrum (710% above sea level) and are, at the same time, a function of altitude. This value should be subtracted from the data processing. Thorium decay products and potassium does not constitute radioactive sources in the atmosphere. Therefore, as long as it is not raining, it is not hard to find their surface content through the correct analysis of aerial gamma ray energy spectrum data. The repeatability of the measurement is ± 2%. Measure uranium on the ground