The Origins of Scintillator Non-Proportionality

William Moses, G BIZARRI, Richard Taylor Williams, Payne, A VASILEV, Jai Singh, Q Li, J.Q Grim, W CHOONG

    Research output: Contribution to journalArticle

    Abstract

    Recent years have seen significant advances in both theoretically understanding and mathematically modeling the underlying causes of scintillator non-proportionality. The core cause is that the interaction of radiation with matter invariably leads to a non-uniform ionization density in the scintillator, coupled with the fact that the light yield depends on the ionization density. The mechanisms that lead to the luminescence dependence on ionization density are incompletely understood, but several important features have been identified, notably Auger-like processes (where two carriers of excitation interact with each other, causing one to de-excite non-radiatively), the inability of excitation carriers to recombine (caused either by trapping or physical separation), and the carrier mobility. This paper reviews the present understanding of the fundamental origins of scintillator non-proportionality, specifically the various theories that have been used to explain non-proportionality.
    Original languageEnglish
    Pages (from-to)2038-2044
    Number of pages7
    JournalIEEE Transactions on Nuclear Science
    Volume59
    Issue number5
    DOIs
    Publication statusPublished - 2012

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