Appendix. Radon and radon progeny. The concentration of radon decay progeny (RnDP) is measured in Working Levels or in microjoules of ultimately-delivered alpha energy per cubic metre of air. One 'working level' (WL) is approximately equivalent to 3700 Bq/m 3 of Rn-222 in equilibrium with its decay progeny (the main two of which are very short-lived alpha …
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