A shortcut formula for the 230-MeV proton-induced neutron dose equivalent in concrete after a metal shield, derived from Monte Carlo simulations with MCNPX

A. Taal, A. van der Kooij, W. J C Okx

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Monte Carlo simulations were performed with MCNPX to determine the neutron dose equivalent in thick concrete after a metal shield, a double-layered shielding configuration. In the simulations, a 230-MeV proton beam impinging on a copper target was used to produce the neutrons. For forward angles up to 30° with respect to the proton beam, it is found that the neutron dose equivalent in thick concrete after a metal layer can be expressed in a single formula. This single formula being the neutron dose equivalent formula for a single thick concrete shield enhanced with an additional exponential term. The exponent of this additional exponential term is related to the relative macroscopic neutron removal cross section of the metal with respect to the concrete. The single formula found fits MCNPX data for the neutron dose equivalent in thick concrete after layers of metal ranging from beryllium to lead. First attempts were made to make this shortcut formula applicable to alloys and compounds of metals.

    Original languageEnglish
    Pages (from-to)326-336
    Number of pages11
    JournalRadiation Protection Dosimetry
    Volume171
    Issue number3
    DOIs
    Publication statusPublished - 2016

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