Problems in setting and applying limits for occupational exposure to radon daughters

The problems in setting and applying a limit for exposure to radon daughters in uranium mines include: problems in setting a limit that is equivalent in risk to the 50 mSv limit on effective dose equivalent, taking into account the uncertainties in both the epidemiological data and the dosimetric calculations, and problems in applying the limit, taking into account concurrent exposure to other significant sources of radiation encountered in uranium mines. The Atomic Energy Control Board proposed regulatory amendments in 1983 which included a solution to the above problems based on the recommendations of ICRP-32, but is currently reconsidering the matter in light of comments received during the public consultation process. Alternative approaches are discussed, although the final regulatory position has yet to be decided