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    Gammastralingsniveaumetingen aan de terreingrens van COVRA N.V. te Borsele in 2019 met het MONET-meetnet

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    Authors
    Tanzi, CP
    Series/Report no.
    RIVM rapport 2020-0149
    Type
    Report
    Language
    nl
    
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    Title
    Gammastralingsniveaumetingen aan de terreingrens van COVRA N.V. te Borsele in 2019 met het MONET-meetnet
    Translated Title
    Gamma radiation level measurements around the site of COVRA N.V. at Borsele with the MONET network in 2019
    Publiekssamenvatting
    Het gammastralingsniveau aan de terreingrens van de Centrale Organisatie voor Radioactief Afval (COVRA N.V.) te Borsele lag in 2019 onder het toegestane maximum van 40 microsievert per jaar. De hoogste vastgestelde dosis is 3,0 microsievert. Dit blijkt uit controlemetingen van het RIVM. Het RIVM rapporteert jaarlijks in opdracht van de Autoriteit Nucleaire Veiligheid en Stralingsbescherming (ANVS) en toetst of COVRA N.V. aan de vergunningseis voldoet. COVRA N.V. moet ervoor zorgen dat personen buiten de terreingrens aan maximaal 40 microsievert per jaar worden blootgesteld. Dat is in de kernenergiewetvergunning bepaald. Om de maximale effectieve dosis te berekenen wordt het gammastralingsniveau op twaalf locaties langs de terreingrens gemeten. Dit gebeurt met het MONET-meetnet, dat in beheer is van het RIVM. Van de metingen wordt vervolgens de hoeveelheid die van nature voorkomt afgetrokken (natuurlijke achtergrondwaarde). De resulterende meetwaarde wordt gecorrigeerd met de zogeheten Actuele Blootstellings Correctiefactor (ABC-factor). Een ABC-factor hangt samen met de bestemming van het gebied waar de effectieve gammastralingsdosis kan worden opgelopen. Na het gebruik van de ABC-factor is de berekende maximale effectieve gammadosis 3,0 microsievert per jaar. Dit is ruim onder de maximaal toegestane jaarlijkse limiet. In dit rapport zijn de daggemiddelden van de metingen van de twaalf MONET-monitoren aan de terreingrens van COVRA N.V. in 2019 weergegeven. Ook wordt uitgelegd hoe voor elk meetpunt de natuurlijke achtergrondwaarde is bepaald.
    In 2019, the radiation level caused by gamma radiation at the site boundary of COVRA N.V., the Central Organisation for Radioactive Waste, was below the maximum permitted level of 40 microsievert per year. The maximum annual gamma dose is 3.0 microsievert. This is the level found by the analysis of measurements carried out by RIVM. RIVM is tasked by the Authority of Nuclear Safety and Radiation Protection (ANVS) to report annually on whether COVRA N.V. meets the criterion specified in its operating license. COVRA N.V. is required to ensure that the maximum effective dose received by persons outside the site boundary of COVRA N.V. does not exceed 40 microsievert annually, as specified in its operating license. In order to determine the maximum effective dose, gamma radiation is measured at twelve locations along the site boundary. The measurements are carried out within the framework of the MONET monitoring network, which falls under the administrative management of the RIVM. The measurements are analysed by subtracting the natural background value. The resulting measurement data are corrected using the Actuele Blootstelling Correctiefactor (or ABC factor, meaning actual exposure correction factor). An ABC factor takes into account the specific use of the area where exposure to the gamma dose may occur. This translates into a maximum effective dose of 3.0 microsievert per year, which is far below the maximum permitted annual gamma dose. This report provides the daily averages of the radiation dose recorded by the MONET monitors at the boundary of the COVRA N.V. site in 2019, and explains how the background level at each measuring location was determined.
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    ANVS
    DOI
    10.21945/RIVM-2020-0149
    URI
    http://hdl.handle.net/10029/624517
    ae974a485f413a2113503eed53cd6c53
    10.21945/RIVM-2020-0149
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