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STUK supervises

STUK supervises

Practice that causes exposure to natural radiation

Practice that causes exposure to natural radiation

Section 145 of the Radiation Act states that, prior to the commencement of a practice that causes exposure to natural radiation, the party responsible for it shall notify the Radiation and Nuclear Safety Authority (STUK) of:

  1. any mining as referred to in the Mining Act;
  2. any excavation work or other work carried out in a subterranean passageway or tunnel, in which a single worker’s combined working hours per year is more than 100 hours;
  3. the management, use, storage and recovery of materials and waste containing natural radioactive substances in which the activity concentration of uranium-238, thorium-232 or their progeny is greater than one becquerel in a gram;
  4. engagement in aviation as referred to in section 152.

Notification shall be made of any information that is central in terms of radiation safety with regard to the practice and its organization. This information is determined in more detail in the STUK regulations.

Radiation practice that causes exposure to natural radiation may be

  • work in underground mines, mining sites and in other underground working areas, where the radon concentration of air is significantly high,
  • working in other working areas, where the radon concentration of air is significantly high,
  • delivering water for household consumption to consumers, when the water’s concentration of radioactive materials is higher than normal,
  • manufacturing building materials that contain a higher amount of natural radioactive materials than normal. These building materials include, at least:
    • a building’s framework manufactured from mineral-based raw materials;
    • construction products whose primary raw material consists of crushed rocks, gravel or sand that contains granite or other granitoids, such as granodiorite, tonalite or gneiss;
    • construction products whose raw material consists of intermediate or by-products or waste generated by industries that exploit ash or mineral-based natural raw materials.
  • handling or storing soil, rock or other materials that contain amounts of radionuclides that are higher than normal or materials that have resulted from use of these materials. This practice includes, at least

    • the production of rare earth metals;
    • the production of thorium compounds and the manufacture of products containing thorium;
    • the processing of niobium/tantalum ore;
    • the production and refining of oil and gas;
    • the production of geothermal energy;
    • the production of titanium dioxide pigment;
    • thermal phosphorus production;
    • the zircon and zirconium industry;
    • the production of phosphate fertilizers;
    • the production of cement and the maintenance of the clinker ovens used therein;
    • the use of peat and coal-fired power plants and the maintenance of the boilers in these plants;
    • the production of phosphoric acid;
    • the reduction smelting of metallic ores and concentrates;
    • the production of household water in ground water processing facilities;
    • the mining of ores other than uranium ore.
  • practice that produces a significant amount of waste containing natural radioactive materials or that causes significant radionuclide releases in the environment,

  • flight operations where the flight personnel’s exposure to cosmic radiation is significant.


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