Understanding radon sources and mitigation in buildings

Abstract

Radon is the largest source of radiation exposure for most people and has been shown clearly to be responsible for an increased risk of lung cancer. Over the last two decades, the UK has undergone a vigorous programme of work to identify homes with high radon levels and encourage occupiers to reduce their exposures. Much of the development and management of this programme was conducted by the Radiation Protection Division of the Health Protection Agency (HPA), formerly the National Radiological Protection Board (NRPB), and involved collaboration with many academic workers, professionals, government officers and employers. Based on experience and feedback from these contacts and measurement campaigns, the NRPB continues to develop new initiatives and programmes to promote greater reduction of doses of radon. Professionals involved with housing comprise a large and potentially very influential group with an important role in raising awareness about radon and its reduction. This paper summarises the mechanisms and features of radon mitigation for professionals who might wish to advise occupiers or contractors about radon, focusing on the choice and effect of mitigation systems. The paper also reflects the current position on important elements of radon protection strategy, including identification of high-level areas, the suitability of measurement procedures and targets for dose reduction.