Abstract
Ionizing radiation dose levels due to home radon can rise to levels that wouldbe illegal for workers in the nuclear industry. It is well known that radonlevels within homes and from home to home, and also from month to month, varyconsiderably. To define an Isle of Man radon seasonal correction factor,readings were taken in eight homes over a 12 month period. An average islandindoor exposure of 48 Bq m-3 (range 4-518 Bq m-3) was determined from 285 homes selected from a cohort of1300 families participating in the European Longitudinal Study of Pregnancyand Childhood (ELSPAC) in the Isle of Man. This compares with a UK homeaverage of 20 Bq m-3 and a European Union average (excludingUK) of 68 Bq m-3. Ten homes of those measured were found tohave radon levels above the National Radiological Protection Board 200 Bq m-3 action level. There are 29 377 homes on the Isle of Man,suggesting that there could be some 900 or more homesabove the action level. No statistical difference was found between the NRPBand Isle of Man seasonal correction factors.
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