Abstract

This paper describes how the Tensioned Metastable Fluid Detector (TMFD) sensor technology was successfully configured and qualified for efficient, accurate, spectroscopic, and cost-effective radon and progeny spectroscopic detection alongside meeting/exceeding the standards set by the American Association of Radon Scientists and Technologists-National Radon Proficiency Program (AARST-NRPP) Device Evaluation Program (DEP). The DEP represents addressing of a challenging test matrix that assesses a radon collection and measurement device's performance over a variety of functional parameters, and environmental conditions. Qualification test conditions covered in this study included performance vetting of the centrifugally tensioned metastable fluid detector (CTMFD) technology under a wide range of: temperatures, non-condensing relative humidity levels, condensing conditions, atmospheric pressures, background photon radiation, non-ionizing external electromagnetic fields, shock and vibration, and air movement. Of all these parameters, only the ambient temperature played a first-order role on radon collection; for this reason, a dynamic compensation algorithm was developed and successfully validated. The remaining AARST-NRPP test parameters were found to have negligible affects. In comparison to state-of-art radon detector systems, the resulting radon specific CTMFD (R-CTMFD) sensor system and protocol are shown to provide for superior sensitivity along with spectroscopic identification of radon-progeny alpha emitters while remaining 100% blind to interfering gamma-beta background radiation.

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