Coverage:Great Britain and Northern Ireland
Format:GIS polygon data. (ESRI, MapInfo, other available by request)
£0.30 per km2. Subject to number of users, licence fee and data preparation fee.
Uses:Local-level to regional-level use
The Radon data: radon potential dataset is the definitive map of radon affected areas in Great Britain and Northern Ireland, created jointly by Public Health England (PHE) and the BGS using long-term radon measurements made in over 479 000 homes across Great Britain and 23 000 homes across Northern Ireland (without affecting householders’ confidentiality), combined with geological map data.
The dataset includes a built-in 75 m ‘buffer’; this comprises 50 m to allow for the margin of error in the geological lines plus a further 25 m to represent the average extent of a home.
PHE recommends that radon levels should be reduced in homes where the annual average is at or above 200 becquerels per cubic metre (200 Bq/m3) – this is termed the ‘radon action level’.
PHE defines radon affected areas as ‘those with one per cent chance or more of a house having a radon concentration at or above the radon action level of 200 Bq/m3‘.
The radon potential dataset answers the following questions:
- Is a property in a radon affected area?
- What level of radon protective measures do I need to install if I am building a new building or an extension to an existing building?