The principal of RDS developed the methodology for monitoring the radon activity concentration in soil, air, and water by solid-state nuclear-track detectors. RDS provides the radon-concentration in-air monitoring service by nuclear-track detectors to the uranium mining industry and to caves in Australia.
The Passive Radon Monitor (PRM) is the radon-monitoring system that uses the nuclear-track detector film Kodak LR-115. The film inside the chamber of the featured blue badge is exposed to the alpha radiation of radon and radon decay products. The alpha-track-density-to-radon-activity-concentration exposure conversion factor is obtained through system calibration inside the South Australian EPA Radiation Protection Branch Radon Calibration Chamber.
Typically, the PRM is exposed in either an outdoor or indoor air environment for a period of 3 months. Exposed PRMs are sent to RDS for evaluation. The Lowest Limit of Detection (LLD) of measured radon activity concentration by the PRM is about 7 Bq/m³.
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