Run-off from roofs

Jørn Roed

    Research output: Book/ReportReport

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    Abstract

    Abstract. In order to find the run-off from roof material a roof has been constructed with two different slopes (30° and 45°). Beryllium-7 and caesium-137 has been used as tracers. Considering new roof material the pollution removed by runoff processes has been shown to be very different for various roof materials. The pollution is much more easily removed from silicon-treated material than from porous red-tile roof material. Caesium is removed more easily than beryllium. The content of caesium in old roof materials is greater in red-tile than in other less-porous roof materials. However, the measured removal from new material does not correspond to the amount accumulated in the old. This could be explained by weatherinq and by saturation effects. This last effect is probably the more important. The measurements on old material indicates a removal of 44-86% of the caesium pollution by run-off, whereas the measurement on new showed a removal of only 31-50%. It has been demonstrated that the pollution concentration in the run-off water could be very different from that in rainwater. The work was part of the EEC Radiation Protection Programme and done under a subcontract with Association Euratom-C.E.A. No. SC-014-BIO-F-423-DK(SD) under contract No. BIO-F-423-81-F.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages17
    ISBN (Print)87-550-1070-9
    Publication statusPublished - 1985
    SeriesRisø-M
    Number2471
    ISSN0418-6435

    Keywords

    • Risø-M-2471
    • Beryllium 7
    • Building materials
    • Buildings
    • Cesium 137
    • Decontmination
    • Precipitation scavening
    • Rain water
    • Reviews
    • Run-off
    • Tracer techniques
    • Weathering

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