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加拿大铀矿勘探公司于1973年开始生产 DISA 400型伽玛能谱仪,装备有测井用和地面测量用二种探头。该仪器可同时进行微分纪录。瑞典 ABEM 公司生产的 ABA-PRS型轻便射气仪适用于野外土壤气体和地下水的氡含量测量。它所测量的是活性炭圆筒内铀的β放射性,不受钍和其他污染的干扰。
The Uranium Exploration Company of Canada began production of the DISA 400 gamma spectrometer in 1973 and is equipped with two probes for logging and ground surveying. The instrument can record differential at the same time. The ABA-PRS Portable Radiometer from ABEM Sweden is suitable for measuring radon content in the field soil gas and groundwater. It measures the beta radioactivity of uranium in activated carbon cylinders and is immune to thorium and other contaminants.