The role of different linear and non-linear channels of relaxation in scintillator non-proportionality
Identifieur interne : 008020 ( Main/Exploration ); précédent : 008019; suivant : 008021The role of different linear and non-linear channels of relaxation in scintillator non-proportionality
Auteurs : G. Bizarri [États-Unis] ; W. W. Moses [États-Unis] ; J. Singh [Australie] ; A. N. Vasil'Ev [Russie] ; R. T. Williams [États-Unis]Source :
- Journal of luminescence [ 0022-2313 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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 Nal 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).
Affiliations:
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carrier mobility</term>
<term>Excitons</term>
<term>Kinetics</term>
<term>Luminescence</term>
<term>Modelling</term>
<term>Relaxation</term>
<term>Scintillator</term>
<term>Stopping power</term>
<term>Two channel system</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Luminescence</term>
<term>Relaxation</term>
<term>Cinétique</term>
<term>Mobilité porteur charge</term>
<term>Exciton</term>
<term>Pouvoir arrêt</term>
<term>Modélisation</term>
<term>Système 2 canaux</term>
<term>Scintillateur</term>
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<front><div type="abstract" xml:lang="en">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 Nal 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).</div>
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