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  1. Assessment of need for transport tubes when continuously monitoring for radioactive aerosols.

    Article - En anglais

    Aerosol transport tubes are often used to draw aerosol from desirable sampling locations to nearby air sampling equipment that cannot be placed at that location.

    In many plutonium laboratories at Los Alamos National Laboratory, aerosol transport tubes are used to transport aerosol from the front of room ventilation exhaust registers to continuous air monitors (CAMs) that are mounted on nearby walls.

    Transport tubes are used because past guidance suggests that extraction of aerosol samples from exhaust locations provides the most sensitive and reliable detection under conditions where the rooms have unpredictable release locations and significant spatial variability in aerosol concentrations after releases, and where CAMs cannot be located in front of exhaust registers without blocking worker walkways.

    Despite designs to minimize particle loss in tubes, aerosol transport model predictions suggest losses occur lowering the sensitivity of CAMs to accidentally released plutonium aerosol.

    The goal of this study was to test the hypotheses that the reliability, speed, and sensitivity of aerosol detection would be equal whether the sample was extracted from the front of the exhaust register or from the wall location of CAMs.

    Polydisperse oil aerosols were released from multiple locations in two plutonium laboratories to simulate plutonium aerosol releases. (...)

    Mots-clés Pascal : Aérosol, Produit radioactif, Transport, Appareillage, Tube, Sécurité, Surveillance, Ventilation, Dosimétrie, Technique, Evaluation

    Mots-clés Pascal anglais : Aerosols, Radioactive product, Transport, Instrumentation, Tube, Safety, Surveillance, Ventilation, Dosimetry, Technique, Evaluation

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0476876

    Code Inist : 002B30B04. Création : 22/03/2000.