Abstract
We have developed a passive method of determining radon concentration. The detector is a plastic canister containing 85 g of activated carbon. The radon adsorbed in the canister is measured by a gamma ray spectrometer. The detector's performance has been tested with respect to response, air-tightness, reproducibility and the effects of temperature, humidity, exposure time, etc. Its advantages have been demonstrated in an investigation of indoor radon levels in Beijing.
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