Radon Radon

Radon

Radon

Reference values and regulations concerning radon in dwellings

Reference values and regulations concerning radon in dwellings

According to the Ministry of Social Affairs and Health’s Decree on Ionizing Radiation, the reference value for the radon concentration in indoor air in dwellings and other living areas is 300 becquerels per cubic metre (Bq/m³) of air.

The radon concentration is determined as the annual average radon concentration, either measured or estimated on the basis of measurement during a continuous period of twelve months. The measurement must be continuous, must last at least two months and must be conducted between the beginning of September and the end of May.

In designing and constructing new buildings, the reference value for the radon concentration in indoor air is 200 Bq/m³.

The term radon concentration refers to the annual average radon concentration, either measured or determined on the basis of measurement as the average radon concentration during a continuous period of twelve months. The radon concentrations stated in the result report received from the laboratory that conducted the radon measurements are averages of the concentrations that prevailed during measurement. The reference values 200 and 300 Bq/m3 refer to the annual average radon concentration. The annual average radon concentration is calculated by multiplying the result measured during the radon measurement period (1 September–31 May) by 0.9.  Accurate determination of the annual average radon concentration requires 12-month measurement.

Regulations and guidelines concerning radon-safe construction work.

  • Decree of the Ministry of the Environment on Foundation Structures, 465/2014.
  • Decree of the Ministry of the Environment on Indoor Climate and Ventilation of Buildings, 1009/2017.
  • National Building Code of Finland, Strength and stability of structures, Design of foundations (Ministry of the Environment, 2018)
  • Rakennustieto Oy. Radonin torjunta. RT reference card RT 81-11099, LVI 37-10513, KH 27-00510. (Radon prevention, available in Finnish).

National Building Code of Finland (Ministery of Environment, ym.fi)

Contact

Contact

  • Päivi Kurttio / Head of Laboratory
    Tel. +358975988554