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    Development of a High Volume Air Sampler for the sensitive detection of gamma-emitting radionuclides attached to aerosols. Results obtained in the test period 1991-1992

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    Authors
    Tax RB
    Kwakman PJM
    van Lunenburg APPA
    Tijsmans MH
    Type
    Report
    Language
    en
    
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    Title
    Development of a High Volume Air Sampler for the sensitive detection of gamma-emitting radionuclides attached to aerosols. Results obtained in the test period 1991-1992
    Translated Title
    Ontwikkeling van de HVS monitor om de activiteitsconcentratie van gamma-straling uitzendende nucliden verbonden aan aerosol deeltjes te meten. Resultaten gedurende de testjaren 1991 en 1992
    Publiekssamenvatting
    De aanwezigheid van niet natuurlijke radioactieve nucliden in de lucht wordt voornamelijk veroorzaakt door kernproeven of door uitstoot van en ongelukken bij nucleaire installaties. Om in een vroeg stadium kleine incidenten te kunnen registreren is het noodzakelijk om de activiteitsconcentratie van gamma-straling uitzendende nucliden gebonden aan aerosol deeltjes met een hoge gevoeligheid te kunnen meten. Om een detectielimiet van minder dan 1 mu-3Bq.m-3 te bereiken is een High Volume Sampler (HVS) noodzakelijk die meer dan 50.000 m3 per week kan bemonsteren. In dit rapport wordt de ontwikkeling door het LSO van een HVS beschreven. Geconcludeerd kan worden dat het mogelijk is met de ontwikkelde HVS-meetmethode om met hoge gevoeligheid de activiteitsconcentratie van gamma-straling-uitzendende nucliden gebonden aan aerosol deeltjes te meten. Aanbevolen wordt om onderzoek te doen betreffende de onzekerheid van de kalibratie van de put-detector. Dit onderzoek moet zich voornamelijk richten op de problemen die veroorzaakt worden door het cascadeverval.<br>
    The presence of man made radionuclides in air originates, mainly, from experiments with nuclear weapons or from discharges and accidents at nuclear installations. An early warning for small incidents requires a sensitive monitoring of the activity concentration of gamma-emitting radionuclides attached to aerosols. To achieve a detection limit lower than 1 muBq.m-3 a High Volume air Sampler (HVS) is needed which is able to sample volumes of at least 50,000 m3 per week. In this report the development of a High Volume Air Sampler (HVS) by the Laboratory of Radiation Research is described. It is concluded that sensitive monitoring of the activity concentration is possible with the developed HVS measuring method. Further investigation of the well detector calibration is recommended and should be concentrated on the problems concerning coincidence summing effects.<br>
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    HIMH/TSSP
    HIMH/CM
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