PubMed · 8449730
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A Brodsky. 1993. Standardizing minimum detectable amount formulations.. https://pubmed.ncbi.nlm.nih.gov/8449730/
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A new method to trace back average radon concentrations in dwellings over several decades in time has been developed. This retrospective radon monitor is based on the measurement of the alpha activity of 210Po deposited in volume traps, e.g., spongy materials used for mattresses and cushions. Polyester samples with different densities have been exposed to radon-laden air. The exposures correspond to characteristic radon concentrations between 390 Bq m-3 and 3.9 kBq m-3 over a 20 y period. The precision in converting the 210Po-signal to the radon exposure has been improved by more than one order of magnitude compared to other common techniques. It is shown that this very sensitive method may be applied to almost all types of volume traps used in households.
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222Rn concentrations in some Taiwanese hot spring spa waters have been monitored using commercially available electret ion chambers (EIC). The use of two EIC units for measuring radon concentrations in the air phase and voltage dependent correction factors for subtracting gamma contributions resulted in improved accuracy.