Indoor Radiation Surveys in the UK

• Published in: Radiation protection dosimetry 1984-01, Vol.7 (1-4), p.321-325
• Main Authors: Wrixon, A.D., Brown, L., Cliff, K.D., Driscoll, C.M.H., Green, B.M.R., Miles, J.C.H.
• Format: Article
• Language: English
• ISSN: 0144-8420; 1742-3406
• DOI: 10.1093/oxfordjournals.rpd.a083020

Current estimates indicate that approximately 50% of the average effective dose equivalent received by the UK population from all sources is due to indoor exposure by terrestrial gamma rays and the short-lived decay products of radon-222. There is, however, considerable uncertainty about this estimate. A national survey of indoor exposure was therefore started in 1982. The intention is to survey over 2,000 homes, selected representatively, by the end of 1984. The living area and main bedroom of each home are being monitored with passive detectors for a year. CR-39 plastic is being used to measure radon gas concentrations and LiF chips to measure external radiation levels. A pilot study of about 140 houses was undertaken beforehand to test the administrative procedures and scientific techniques. Indoor exposure, particularly from radon decay products, is quite variable and an important factor is the geology of the land on which dwellings are built. Additional, more detailed surveys are therefore being undertaken in particular areas of the country. Measurements of gamma radiation dose rates, radon decay product concentrations and ventilation rates are made during visits to homes and long-term average measurements of radon gas concentrations are made with passive radon dosemeters. This paper describes the administrative and scientific aspects of the national and regional surveys. It also discusses the factors to be taken into account in converting the measurements into estimates of public exposure. Preliminary results from the national and regional studies are presented.