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Forum: Geometry
Date: 08 Dec, 2014
From: Tony Price <Tony Price>

Hi All,

I have noticed a discrepancy in my Geant4 simulation results dependant on how I define a material and wondered if somebody could explain to me why. I have a simple setup which is a beam of 36 MeV protons into a Persepx target where I reconstruct the Bragg Peak.

If I used G4_PLEXIGLASS from the NIST database I get a certain bragg peak. However, if I define my own persepx (previous work before discovering the NIST database) I see different results. I have cross checked and the composition of materials is exactly the same, as is the density of the material. One point I did notice was a different I value calculated from my material compared to the one in the database. When I overwrite this value to be 74.0eV as the database states I still get different results! I attach a plot to highlight this.

I have no issues using the NIST material but was wondering if somebody could offer me an explaination of why I get different results even though my defined material is identical?

Thanks,

Tony

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/12/08/05.02-92399-arePerspexDefinitions.png

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1 Idea: Re: Discrepancy with Material Definitions   (Vladimir Ivanchenko - 08 Dec, 2014)
(_ None: Re: Discrepancy with Material Definitions   (Tony Price - 08 Dec, 2014)
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