STUK supervises STUK supervises

STUK supervises

STUK supervises

External radiation and radioactive materials in outdoor air

External radiation and radioactive materials in outdoor air

The Radiation and Nuclear Safety Authority (STUK) monitors the background radiation and radioactive materials in outdoor air in Finland. If abnormalities are observed in the measurements, STUK will start to investigate the origins of the observation.

In Finland, background radiation normally varies from 0.05 to 0.30 microsieverts per hour (µSv/h). Regional variation in dose rates is due to differences in the uranium content in rock and soil.  The weather conditions also play a role in background radiation. Layers of snow and ice attenuate radiation from the ground. During heavy thunderstorms, the dose rate may momentarily rise.

There is an automatic external radiation monitoring network in Finland that includes approximately 260 measurement stations. The monitoring network has two main tasks: raising the alarm about increasing radiation levels and producing a real-time radiation situation overview.

The measurement data generated by the monitoring network is updated on the STUK website once an hour. Take a look at the results on the Radiation today webpage.

The Finnish Radiation and Nuclear Safety Authority STUK monitors the levels of radioactive substances outdoors at eight localities in Finland. The localities are Helsinki, Imatra, Ivalo, Kajaani, Kotka, Kuopio, Rovaniemi and Sodankylä.