Progress in Studying Scintillator Proportionality: Phenomenological Model

G BIZARRI, N CHEREBY, W CHOONG, G HULL, William Moses, Jai Singh, J VALENTINE, A VASILEV, R.T. Williams

    Research output: Contribution to journalArticle

    Abstract

    We present a model to describe the origin of non-proportional dependence of scintillator light yield on the energy of an ionizing particle. The non-proportionality is discussed in terms of energy relaxation channels and their linear and non-linear dependences on the deposited energy. In this approach, the scintillation response is described as a function of the deposited energy deposition and the kinetic rates of each relaxation channel. This mathematical framework allows both a qualitative interpretation and a quantitative fitting representation of scintillation non-proportionality response as function of kinetic rates. This method was successfully applied to thallium doped sodium iodide measured with SLYNCI, a new facility using the Compton coincidence technique. Finally, attention is given to the physical meaning of the dominant relaxation channels, and to the potential causes responsible for the scintillation non-proportionality. We find that thallium doped sodium iodide behaves as if non-proportionality is due to competition between radiative recombinations and non-radiative Auger processes. � 2006 IEEE.
    Original languageEnglish
    Pages (from-to)2313-2320
    Number of pages8
    JournalIEEE Transactions on Nuclear Science
    Volume56
    DOIs
    Publication statusPublished - 2009

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    BIZARRI, G., CHEREBY, N., CHOONG, W., HULL, G., Moses, W., Singh, J., VALENTINE, J., VASILEV, A., & Williams, R. T. (2009). Progress in Studying Scintillator Proportionality: Phenomenological Model. IEEE Transactions on Nuclear Science, 56, 2313-2320. https://doi.org/10.1109/TNS.2009.2022625