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Forum: Geometry
Re: None NIST Material vs G4Material (Jérôme Roccaz)
Date: 23 Apr, 2012
From: michel maire <michel maire>

On Mon, 23 Apr 2012 11:42:46 GMT, J&#65533;r&#65533;me Roccaz wrote:
> Hi everyone,
> 
> I'm using the defined NIST G4_POLYETHYLENE as neutron moderator
> material. As I want to modify this material, I've first tested building
> my own polyethylene with G4Element and using data in Geant4 User's guide
> like this :
> 
> density = 0.94*g/cm3; G4Material* PEHDtest = new
> G4Material(name="PEHDtest", density, ncomponents=2);
> PEHDtest->AddElement(elH, fractionmass=0.143711);
> PEHDtest->AddElement(elC, fractionmass=0.856289);
> PEHDtest->GetIonisation()->SetMeanExcitationEnergy(57.4*eV);
> 
> When I compare results with both material definitions, they are slightly
> different. Do I miss something in my own definition?
> 
  Which differences are you speaking about ?

 By default, Nist construtor build isotopes composition, AddElement not (until 9.5)
 For hadronic interaction, it could make differences. Not for EM interactions.

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1 More: Re: NIST Material vs G4Material   (Jérôme Roccaz - 23 Apr, 2012)
(_ None: Re: NIST Material vs G4Material   (michel maire - 24 Apr, 2012)
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