It is the duty of the Radiation and Nuclear Safety Authority to maintain the national metrological standards, which help ensure the reliability of radiation measurements.
Metrological standards include precise measuring instruments (ionization chambers), methods of measurement or radiation sources, which are used to calibrate other measuring instruments. The national metrological activities create the foundation for ensuring that the radiation measurements taken in Finland and relating to regulatory control are reliable and internationally comparable. STUK also offers calibration and irradiation services to the users and manufacturers of radiation meters.
As the national standard laboratory for radiation quantities, STUK is an expert in radiation metrology and maintains and develops, for its part, the national metrological system and is responsible for maintaining the SI system with regard to radiation variables.
STUK is a member of the European Association of National Metrology Institutes (EURAMET). STUK is also a member of the network of standard laboratories for radiation quantities of ionizing radiation maintained jointly by the International Atomic Energy Agency (IAEA) and the World Health Organisation (WHO), and participates in the annual benchmark measurements.
STUK’s position as the national radiation quantity standard laboratory is based on legislation. Finland’s national metrological activities are the responsibility of the Centre for Metrology and Accreditation (MIKES).