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Idea Re: gamma transmission -- physics models incorrect for thick materials  

Forum: Physics List
Re: Question gamma transmission -- physics models incorrect for thick materials (Chris Howard)
Date: 11 Jan, 2015
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello,

First of all, likely you choose not the best forum, because results of transmission are defined by simulation of electromagnetic physics. Any additional component has no effect. So, more adequate would emprocess forum.

The fact that your MC shape shows some plato is really strange - this means that material become transparent and low-energy particles (what kind? gamma? what spectrum?) have no absorption. 

A simple check of the situation may be done with $G4INSTALL/example/extended/electromagnetic/TestEm5   

you define monochromatic beam with some energy, enable tracking of secondaries, and vary thickness of the target. First of all, you can confirm your results using standard log output, after may study what happens. For example, in histograms of the example you may see distributions on transmitted energies. If you use this example, you do not need code anything, only play with UI commands in macro file.

VI 

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1 Ok: Re: gamma transmission -- physics models incorrect for thick materials   (Chris Howard - 12 Jan, 2015)
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