Radon affected areas: Derbyshire, Northamptonshire and Somerset

Board advice on radon in homes issued in 1990 specifies that areas of the UK where 1% or more of homes exceed the Action Level of 200 becquerels per cubic metre of air should be regarded as Affected Areas. Results of radon measurements in homes in Derbyshire, Northamptonshire and Somerset are mapped and used to delineate Affected Areas in these counties. The Department of the Environment is advised to consider which localities should be delimited for precautions against radon in future homes. Advice on other areas will be proffered as data become available. (author)