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美国地质调查所研究成了一种测量He含量的车载质谱仪。该仪器在已知铀矿区作了试验，并在土壤气和水中都发现了He异常。气体样品收集在注射器式取样器里，然后注入到质谱仪中作He分析。仪器以10ppb的灵敏度每天可做100多次分析。在科罗拉多州维尔德郡所进行的详细研究表明，根据土壤气体的He值所编绘的等值线图，能圈定出异常区，同时异常相对矿体沿地下水的下流方向有所偏移。其它研究包括如下地点：科罗拉多州杰弗逊郡舒瓷兹瓦尔德铀山矿，那里He异常可能与地质构造有关；新墨西哥州安布罗西亚湖附近的地区，那里He异常位置与地下水运动有关；周日效应试验结果表明，He的变化甚微，可能与土壤湿度有关。
The US Geological Survey has developed a car-mounted mass spectrometer that measures He content. The instrument was tested at known uranium mines and He anomalies were found in both soil gas and water. Gas samples were collected in a syringe-type sampler and injected into a mass spectrometer for He analysis. Instrument with 10ppb sensitivity can do more than 100 times a day analysis. A detailed study conducted in Wilde County, Colorado, shows that contour maps based on He values for soil gas can delineate anomalous zones, with anomalous relative orebodies offset along the downstream direction of groundwater. Other studies include the following locations: the Schuzandwald uranium mine in Jefferson County, Colorado, where He anomalies may be related to geological formations; areas near Lake Ambrosia in New Mexico, where anomalous He locations are associated with groundwater movement; and Sunday The results of the effect test show that He has little change and may be related to soil moisture.