The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber

H. Koivunoro, T. Schmitz, E. Hippeläinen, Y. H. Liu, T. Serén, P. Kotiluoto, I. Auterinen, S. Savolainen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    The mixed neutron-photon beam of FiR 1 reactor is used for boron-neutron capture therapy (BNCT) in Finland. A beam model has been defined for patient treatment planning and dosimetric calculations. The neutron beam model has been validated with an activation foil measurements. The photon beam model has not been thoroughly validated against measurements, due to the fact that the beam photon dose rate is low, at most only 2% of the total weighted patient dose at FiR 1. However, improvement of the photon dose detection accuracy is worthwhile, since the beam photon dose is of concern in the beam dosimetry. In this study, we have performed ionization chamber measurements with multiple build-up caps of different thickness to adjust the calculated photon spectrum of a FiR 1 beam model.

    Original languageEnglish
    Pages (from-to)134-138
    Number of pages5
    JournalApplied Radiation and Isotopes
    Volume88
    DOIs
    Publication statusPublished - 1 Jan 2014
    MoE publication typeA1 Journal article-refereed

    Keywords

    • BNCT
    • Dosimetry
    • Ionization Chamber
    • MCNP5
    • Monte Carlo
    • Penelope

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