Monte Carlo Simulation of collimated Sr90 source

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Revision as of 13:11, 28 March 2009 by Zihlmann (Talk | contribs)

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A small monte carlo simulation based on GEANT4 has been used to model the energy loss of the electrons from the Sr90 source in the fiber scintillatior. The basic geometry is a copper collimator of 4mm thickness with a slit of 0.5mm width and 2mm or 5mm length. The fiber scintillator is simulated with 1mm diameter with cladding thickness of 6% of the total fiber diameter. The initial energy spectrum of the electrons from the Sr90 source is modeled with a 6th order polynomial giving the event weight. Electrons are generated randomly on a 5mm by 5mm area with a polar angle between zero to 55 degree and azimuthal angle from 0 to 360 degree. The result is shown in the following two plots for a 2mm slit and 5mm slit. The energy spectrum have a 100keV cut on the energy in the trigger scintillator.
Collimator 2mm eloss.jpg Collimator 5mm eloss.jpg