The role of different linear and non-linear channels of relaxation in scintillator non-proportionality

G BIZARRI, William Moses, Jai Singh, A VASILEV, R.T. Williams

    Research output: Contribution to journalArticle

    Abstract

    The non-proportional dependence of a scintillator's light yield on primary particle energy is believed to be influenced crucially by the interplay of non-linear kinetic terms in the radiative and non-radiative decay of excitations versus locally deposited excitation density. A calculation of energy deposition, -dE/dx, along the electron track for NaI is presented for an energy range from several electron-volt to 1 MeV. Such results can be used to specify an initial excitation distribution, if diffusion is neglected. An exactly solvable two-channel (exciton and hole(electron)) model containing 1st and 2nd order kinetic terms is constructed and used to illustrate important features seen in non-proportional light-yield curves, including a dependence on pulse shaping (detection gate width). � 2009 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)1790-1793
    Number of pages4
    JournalJournal of Luminescence
    Volume129
    Issue number12
    DOIs
    Publication statusPublished - 2009

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