source: trunk/documents/UserDoc/DocBookUsersGuides/PhysicsReferenceManual/latex/electromagnetic/xrays/scint.tex@ 1280

% GEANT4 Physics Reference Manual - Scintillation Process
% in LaTex 2e - by P. Gumplinger

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%\title{Scintillation}
%\author{P.~Gumplinger}
%\date{December 7, 1998}
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\section{Scintillation}

Every scintillating material has a characteristic light yield, $Y\,
(photons/MeV$), and an intrinsic resolution which generally broadens
the statistical distribution, $\sigma_i/\sigma_s > 1$, due to impurities
which are typical for doped crystals like NaI(Tl) and CsI(Tl). The
average yield can have a non-linear dependence on the local energy
deposition.  Scintillators also have a time distribution spectrum with
one or more exponential decay time constants, $\tau_{i}$, with each
decay component having its intrinsic photon emission spectrum. These are
empirical parameters typical for each material. \\ 

\noindent
The generation of scintillation light can be simulated by sampling the 
number of photons from a Poisson distribution.  This distribution is based
on the energy lost during a step in a material and on the scintillation
properties of that material.  The frequency of each photon is sampled from 
the empirical spectra.  The photons are generated evenly along the track 
segment and are emitted uniformly into $4\pi$ with a random linear 
polarization.
 
\subsection{Status of this document}
07.12.98 created by P.Gumplinger

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