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Environmental radiation We are monitoring radiation in environment in many ways. Our aim is to be aware of radiation that people and environment are exposured. Radiation today Radiation in Europe Monitoring of environmental radiation Radioactivity...https://stuk.fi/en/environmental-radiation
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Hiddenhttps://stuk.fi/en/electromagnetic-fields
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Quality System The quality system of the Radiation Metrology Laboratory is internationally recognized. The laboratory participates in the international CIPM MRA Mutual Recognition Arrangement coordinated by the International Bureau of Weights and ...https://stuk.fi/en/quality-system
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Please enter one or more search word Search Clear 42 results Who is the sunbed's responsible person and what are their duties? The responsible person is appointed by the sunbed owner and is tasked with ensuring the safe use of the sunbed. For exam...https://stuk.fi/en/frequently-asked
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STUK Blog In STUK's blogs, our experts discuss interesting, current phenomena and topics in the field of radiation and nuclear safety. The most recent blog posts are listed as columns on this page. The page is under construction. We apologise for ...https://stuk.fi/en/stuk-column
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Metrological standards The Radiation and Nuclear Safety Authority (STUK) maintains national metrological standards that enable the reliability of radiation measurements. Metrological standards are, for example, precise measuring devices (ionizatio...https://stuk.fi/en/metrological-activities
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Legislation and guides This section contains the most important legislation, regulations, directives and international agreements for STUK's activities. Stuklex (stuklex.fi) is a legal database compiled from the essential regulation applied in Fin...https://stuk.fi/en/legislation-and-guides
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For the media The communications service of the Radiation and Nuclear Safety Authority STUK is happy to help media representatives find the right expert to discuss about radiation and nuclear safety. You can also subscribe to STUK's press releases...https://stuk.fi/en/information-for-media
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Sustainability and responsibility Sustainable development is a continuous and managed social change taking place globally, regionally and locally, with the goal of securing good living opportunities for current and future generations. This also me...https://stuk.fi/en/sustainability
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Courses and Events Information about STUK's upcoming courses and events. 27-28 Oct 2025 MELODI workshop on medical radiation Hiddenhttps://stuk.fi/en/courses-and-events
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Valitse kieli Suomi Välj språket Svenska Select language English Director General’s review Like previous years, 2023 was a year of success for STUK. Professional and motivated personnel achieved monitoring and operational objectives as expected. S...https://stuk.fi/en/director-general-s-review-2023
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Nuclear security arrangements Nuclear security arrangements are measures to secure the use of nuclear energy from activities that endanger nuclear and radiation safety. Safety arrangements are implemented in the nuclear facility and its area as we...https://stuk.fi/en/nuclear-security-arrangements
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Sun's UV radiation Exposure to high levels of ultraviolet radiation (UV radiation) and burning of the skin increases the risk of skin cancer. Protection from the sun's UV rays is particularly important for children and people with fair skin, red h...https://stuk.fi/en/sun-s-uv-radiation
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Small modular reactors STUK is preparing for the possibility that there will be desire want to build smaller nuclear power plants with an electricity output of less than 300 megawatts and small nuclear power plants intended solely for heat product...https://stuk.fi/en/small-modular-reactors
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Radiation in beauty care Many aesthetic or cosmetic treatments are based on treating the skin or body with radiation. Radiation is used, for example, to remove tattoos or body hair, to fade skin imperfections and to reshape the body by removing fa...https://stuk.fi/en/radiation-in-beauty-care
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Information on nuclear waste Radioactive waste means a material, item or structure that contains radioactive substances, has no use and which, due to its radioactivity, must be rendered harmless. Typically, radioactive waste cannot be disposed of;...https://stuk.fi/en/information-on-nuclear-waste
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Radiation measurements and approvals Radiation is measured for a variety of reasons, and there are different types of radiation detectors in use. In all measurements, it is important to use a right kind of measuring instrument for the purpose and ...https://stuk.fi/en/radiation-measurements-and-approvals
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Guidelines for different sectors On these pages you will find guidelines for different sectors. The guidelines will help you to interpret and comply with radiation legislation and thus promote radiation safety. Hiddenhttps://stuk.fi/en/guidelines-for-different-sectors
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Licensing of nuclear facilities The use of nuclear energy is not permitted without the appropriate license. The Nuclear Energy Act (990/1987) sets out the requirements for licensing procedures, regulatory oversight and competent authorities for th...https://stuk.fi/en/licensing-of-nuclear-facilities
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Transport of radioactive substances Transport of radioactive substances is considered use of radiation under the Radiation Act. For transport of high-activity sealed sources by road and rail, you also need a safety licence issued by the Radiation ...https://stuk.fi/en/transport-of-radioactive-substances
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Radioactive waste and discharges Unsealed radioactive sources are used, for example, as tracers or radiopharmaceuticals in health care, research and industry. The handling of unsealed radioactive sources often produces waste containing radioactive...https://stuk.fi/en/radioactive-waste-and-discharges
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Data protection at STUK Data protection involves the protection of personal data and its processing in accordance with law. Everybody possesses the right to their personal data and everybody has the right to protection of their personal data. In i...https://stuk.fi/en/data-protection-at-stuk
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Radiation and Nuclear Safety Authority in 2023 Valitse kieli Suomi Välj språket Svenska Select language English Director General’s review STUK monitors around the clock Decommissioning of Finland’s first nuclear reactor started STUK prepares for t...https://stuk.fi/en/year-2023-in-STUK
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Radiation and Nuclear Safety Authority in 2023 Valitse kieli Suomi Välj språket Svenska Select language English Director General’s review STUK monitors around the clock Decommissioning of Finland’s first nuclear reactor started STUK prepares for t...https://stuk.fi/en/year-2023-in-stuk
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Valitse kieli Suomi Välj språket Svenska Select language English Active radon regulation and communication One of the tasks of the Radiation and Nuclear Safety Authority (STUK) is to carry out radon regulation at workplaces. According to a study p...https://stuk.fi/en/radon-monitoring-and-communication
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Indoor air alpha track radon detector measurements Radon is an odourless and invisible radioactive gas that can be present in indoor air. Long-term exposure to high radon levels considerably increases the risk of lung cancer. Radon is undetectable...https://stuk.fi/en/indoor-air-radon-measurements
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Nuclear power plant accidents around the world A reactor at the Chernobyl nuclear power plant in the Soviet Union (present Ukraine) was destroyed in an explosive manner in 1986. The complete destruction of the reactor caused a massive release of r...https://stuk.fi/en/nuclear-power-plant-accidents
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Radon causes lung cancer Radon is a colourless and odourless noble gas that is present in the soil and can penetrate the indoor air of buildings. Long-term exposure to high radon levels increases the risk of lung cancer. Radon exposure is estimate...https://stuk.fi/en/radon-causes-lung-cancer
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Loviisa nuclear power plant The two nuclear power plant units located in Hästholmen, Loviisa, are owned by Fortum Power and Heat Oy. Loviisa 1 was taken into commercial use in 1977 and Loviisa 2 in 1981. In terms of its type, the Loviisa facility ...https://stuk.fi/en/loviisa-nuclear-power-plant
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Dental X-ray practices The purpose of this guideline is to facilitate the interpretation of radiation legislation and, thereby, to promote radiation safety in practice. This guideline is not binding as such, but they reflect STUK's view on how the...https://stuk.fi/en/dental-x-ray-practices
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What is radiation? Radiation is a natural part of our living environment. There are two types of radiation - ionising and non-ionising. On the other hand, radiation can be either electromagnetic waves or particle radiation. Ionising radiation has ...https://stuk.fi/en/what-is-radiation
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Services and guidance You can use this website to contact us if you need a safety permit for the use of radiation or if you need measurement and calibration services, for example. You will also find instructions on how to do this and information o...https://stuk.fi/en/services-and-guidance
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Radiation situation in Ukraine The war in Ukraine does not affect the radiation situation in Finland. Nor can any accident or damage related to radioactive materials or nuclear power plants in Ukraine cause a situation in which people in Finland n...https://stuk.fi/en/situation-in-ukraine
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Radon at workplaces The employer is responsible for radon safety in the workplace, as for other occupational safety issues. The employer is responsible for radon measurements at the workplace, even if the workplace operates in rented premises. Rad...https://stuk.fi/en/radon-at-workplace
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Radioactivity in milk The monitoring programme produces information on the radioactivity levels in milk and the radiation exposure caused to humans by milk consumption. The dairies included in the radiation monitoring programme have been selected ...https://stuk.fi/en/radioactivity-of-milk
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Sources of radon The pore air in the soil always contains high levels of radon. Radon-bearing air from the soil seeps into the building through openings and gaps in the base floor, due to underpressure in the building. This underpressure is caused...https://stuk.fi/en/sources-of-radon
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Valitse kieli Suomi Välj språket Svenska Select language English STUK’s Finances 2024 In 2024, STUK’s operating expenses were approximately EUR 41 million. Approximately 45% (EUR 18.5 million) of operational funding came from the Government’s budg...https://stuk.fi/en/stuk-s-finances-2024
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Nuclear facility operations Regulatory oversight during the operation of the nuclear facility includes continuous safety assessments. By conducting supervision during operation, STUK aims to ensure that the nuclear facilities are and will remain i...https://stuk.fi/en/nuclear-facility-practices
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Natural background radiation Naturally-occurring radioactive materials are an inherent part of our living environment. The ground below our feet and the concrete or brick walls around us emit radiation. We are exposed to radiation from space every...https://stuk.fi/en/natural-background-radiation
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Radiation safety deviations The use of radiation should not cause additional, unforeseen exposure to anyone. In spite of anticipation, it is not always possible to prevent additional exposure and this situation is called a radiation safety deviati...https://stuk.fi/en/radiation-safety-deviations