Computer modelling of terrestrial gamma-radiation fields

P. Kirkegaard, L. Løvborg

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    Abstract

    The plane, one-dimensional photon transport equation is considered in the case of two adjacent media, where one medium contains the Y-ray sources and the other is inactive. Assuming that the sources have a composite line spectrum, and that they are uniformly distributed, an explicit solution is given for the uncollided flux component. The scattered component is evaluated on the basis of the double-P. approximation, involving separate treatments of the upstreaming and the downstreaming flux, and a numerical method for solution of the corresponding equations is presented. The computational method permits determination of the differential and angular energy flux throughout the inactive medium. Formulas for obtaining integral field quantities (scalar energy flux, scalar number flux, and absorbed dose rate) are given. The flux calculation method is used in conjunction with a data processing system for evaluation of terrestrial gamma-radiation fields. A detailed description is given of both the datafiles and the programs of which the system consists. To illustrate the
    performance of the system, results obtained for the radiation field in water
    above sand are presented
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages88
    ISBN (Print)8755002994
    Publication statusPublished - 1974
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number303
    ISSN0106-2840

    Keywords

    • Risø-R-303
    • Risø-303
    • Risø report 303

    Cite this

    Kirkegaard, P., & Løvborg, L. (1974). Computer modelling of terrestrial gamma-radiation fields. Risø National Laboratory. Denmark. Forskningscenter Risoe. Risoe-R, No. 303