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Safety principles Assurance of nuclear safety is based on general principles that have been formed by experience and research. According to these principles, safety is ensured by so-called defence in depth and multiple arrangements. The aim is to ...https://stuk.fi/en/safety-principles
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Learning game for beauty care sector students In spring 2025, the Radiation and Nuclear Safety Authority published a learning game for use by educational institutions in the beauty care sector. The game allows students to learn about the use of ra...https://stuk.fi/en/learning-game
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Hiddenhttps://stuk.fi/en/electromagnetic-fields
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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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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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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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Radiation in appliances Electromagnetic fields from home, school and office equipment There are electric and magnetic fields in the vicinity of electrical appliances and wires in the home, school and office. Due to their low voltage, the electric ...https://stuk.fi/en/radiation-in-consumer-products-and-appliances
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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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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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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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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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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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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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Research reactor in Otaniemi Finland's first nuclear reactor was commissioned in Otaniemi, Espoo, in 1962. The research reactor was decommissioned in 2015, and ten years later, the facility was released from STUK's regulatory oversight. The FiR 1 ...https://stuk.fi/en/research-reactor-in-otaniemi
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Radioactivity of household water Artificial radioactivity in household water intended for human consumption is monitored in order to assess the internal radiation exposure of humans caused by household water. The cesium-137 (Cs-137) and strontium-...https://stuk.fi/en/radioactivity-of-drinking-water
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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-stuk1
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Veterinary X-ray practices The purpose of the guidelines is to facilitate the interpretation of radiation legislation and, thereby, to promote radiation safety in practice. The guidelines are not binding as such, but they reflect STUK's view on ho...https://stuk.fi/en/veterinary-x-ray-practices
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Olkiluoto nuclear power plant The three nuclear power plant units located in Olkiluoto, Eurajoki, are owned by Teollisuuden Voima Oyj (TVO). Olkiluoto 1 was taken into commercial use in 1979 and Olkiluoto 2 in 1982. In terms of its type, the Olkil...https://stuk.fi/en/olkiluoto-nuclear-power-plant