Radon

Definition

Radon gas is a major source of naturally occurring ionising radiation and a major contributor to the ionising radiation doses received by the population. Prolonged exposure to radon may increase the risk of lung cancer. The unit of measurement is the Becquerel per cubic metre (Bq-m-3).

Predominant sources of emissions

It is produced by the natural radioactive decay of uranium in soils and rocks, which penetrates into interior spaces driven by pressure, as the air inside an enclosed space is usually warmer, therefore at lower pressure than the gas in the underlying soil.

Legislation and intervals

According to World Health Organization: The limit value for Radon is 100 Bq/m3 (If such a level cannot be achieved in the current country-specific circumstances, the chosen reference level should in any case not exceed 300 Bq/m3) on an annual average.

According to Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, and repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom, 97/43/Euratom and 2003/122/Euratom: The limit value for Radon is 300 Bq/m3 on an annual average.