Durridge RAD7 Radon Detector is a portable detector that gauges radon and thoron concentrations in water, soil, and air usually used for vapor
USGS Open-File Report 2004-1381, Putting radon to work: Identifying coastal ground-water discharge sites, Figure 2
RAD7 Radon Detector - DURRIDGE Scientific Research radon detectors
Radon Calibration - DURRIDGE Reproducibility of better than ±2%
Products Overview - DURRIDGE Radon & Thoron Measurement Tools
DURRIDGE - Radon Capture & Analytics - RadonMarket
RAD7 Radon Detector - DURRIDGE Scientific Research radon detectors
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Rad7 Radon Measurement