RIVM has carried out a survey of situations in which people are (amenable to be) exposed to ionising radiation that have not been subject to radiation protection legislation, but are so since 6 February 2018. These situations are called 'existing exposure situations'. The survey is a first step for possible policy development on this matter. Existing exposure situations do not encompass situations that already are under regulatory control of the competent regulatory authorities, as for instance is the case for nuclear power plants and radiation generators.
Since 6 February 2018, new European radiation protection legislation requires member states to identify existing exposure situations. These requirements are implemented in the Dutch Decree on Basic Safety Standards for Radiation Protection ("Bbs"). Of the 24 situations identified in the survey, 15 are considered as possible existing exposure situations. The remaining 9 situations are situations that are excluded from regulation, or situations that appeared to be under regulatory control ('planned exposure situations').
The exposure to radon and thoron and exposure to external radiation in buildings are possible existing exposure situations. Taken together, these situations account for a dose of approximately 1 millisievert per year for an average member of the population. This corresponds with approximately 40% of the total average annual exposure to ionising radiation in the Netherlands. An dose of 1 millisievert per year is relatively low in comparison to the 'reference levels', as laid down in European legislation, which should range between 1 and 20 millisievert per year. The exposure in the remaining 12 situations is much lower and is also of a more local nature.
The survey was carried out at the request of the Authority for Nuclear Safety and Radiation Protection (ANVS).