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Radon potential

This layer has been created jointly by the British Geological Survey (BGS) and the Health Protection Agency (HPA). It displays the current definitive map of radon affected areas in the Great Britain. This layer provides the answer to one of the standard legal enquiries on house purchase, known as CON29 Standard Enquiry of Local Authority; 3.13 Radon Gas: Location of the Property in a radon Affected Area. It also provides information on the level of protection required for new buildings under BR 211 (2007) Radon: Guidance on protective measures for new buildings.

Radon is a natural radioactive gas, which enters buildings from the ground. The HPA recommends that radon levels should be reduced in homes where the annual average is at or above 200 becquerels per cubic metre, this is termed the action level. Most homes in the UK have fairly low radon levels with an average of about 20 becquerels per cubic metre. Exposure to high levels of radon increases the risk of some severe medical conditions.

The Radon potential dataset is concerned with naturally occurring radon from geological sources only, and does not cover the impacts from man-made features, apart from the impact of mining over the Northampton Sand Formation. An indication of high radon potential does not necessarily mean that an individual property will have a high radon concentration. The only way to find out the radon present is to carry out a radon measurement. Guidance on measuring radon can be obtained from the HPA.

Data providerBritish Geological Survey
Sample of dataSample layered PDF
Coverage areaBritain

Version date of datasetJune 2017
Frequency of update cycleReviewed annually

Viewable in map windowNA

Export formatsDWG, DXF, TAB, SHP
Maximum export size via internet25 000 hectares (250 kmĀ²)

Period layer saved for viewing (without incurring further costs)12 months
Period print saved for (without incurring further costs)12 months

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