ISO 18589-7:20 13规定了使用配备锗或闪烁探测器的便携式系统的原位伽马能谱法识别放射性核素并测量其在土壤中的活性。 ISO 18589-7:20 13适用于快速评估沉积在调查地点大面积土壤层上或存在于土壤层中的人工和天然放射性核素的活性。 在以下情况下，ISO 18589-7:20 13可与实验室土壤样品的放射性核素测量（ISO 18589？3）结合使用: ·对核设施释放的放射性的影响或该区域放射性的演变进行例行监测； ·调查事故和事件情况； ·规划和监测补救行动； ·设施退役或材料清理。在评估建筑物内或废物处理作业期间的暴露水平时，它还可用于识别空气中的人工放射性核素。 核事故后，原位伽马能谱是快速评估沉积在土壤表面的伽马活性以及扁平物体表面污染的有力方法。

ISO 18589-7:2013 specifies the identification of radionuclides and the measurement of their activity in soil using in situ gamma spectrometry with portable systems equipped with germanium or scintillation detectors. ISO 18589-7:2013 is suitable to rapidly assess the activity of artificial and natural radionuclides deposited on or present in soil layers of large areas of a site under investigation. ISO 18589-7:2013 can be used in connection with radionuclide measurements of soil samples in the laboratory (ISO 18589？3) in the following cases: · routine surveillance of the impact of radioactivity released from nuclear installations or of the evolution of radioactivity in the region; · investigations of accident and incident situations; · planning and surveillance of remedial action; · decommissioning of installations or the clearance of materials. It can also be used for the identification of airborne artificial radionuclides, when assessing the exposure levels inside buildings or during waste disposal operations. Following a nuclear accident, in situ gamma spectrometry is a powerful method for rapid evaluation of the gamma activity deposited onto the soil surface as well as the surficial contamination of flat objects.