The national activity of radon gas in terms of decays per time in a volume of air. The unit of radioactivity concentration is given in Becquerel per cubic meter (Bq/m3). Response options include a number value, or zero when not qualified to answer.
Maximum reference levels of 300 Bq/m3 for homes and 1000 Bq/m3 for workplaces are provided in the IAEA General Safety Requirements Part 3 (GSR Part 3) (link at the bottom of this page)
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