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Idea Re: Defining Material 

Forum: Geometry
Re: Question Defining Material (Aqsa)
Date: 16 Nov, 2017
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello,

atomic properties inside Geant4 material DB were initially (in 2005) obtained by conversion of the NIST material property data. In 2013 M.Trocme & S.Seltzer from NIST checked Geant4 NIST DB and proposed corrections, which we have implemented. We know, that parameters may be changed inside NIST tables with time. From time to time Geant4 DB should be updated if a more accurate information is available.

However, in a real setup parameters of a material may be different from Geant4 and NIST DBs. Potentially, a user may have more precise information, in particular, for densities. For that case, there is an alternative method of the G4NistManager class:

  G4Material* BuildMaterialWithNewDensity(const G4String& name,
                                          const G4String& basename, 
                                          G4double density,
                                          G4double temp = NTP_Temperature,  
                                          G4double pres = CLHEP::STP_Pressure); 
which you may use instead of 
 G4Material* FindOrBuildMaterial(const G4String& name);

in order to define desired density, temperature and pressure. It is possible to use name the same as a basename.

VI

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1 None: Re: Defining Material   (Aqsa - 16 Nov, 2017)
1 Idea: Re: Defining Material   (Vladimir Ivanchenko - 19 Nov, 2017)
2 None: Re: Defining Material   (michel maire - 20 Nov, 2017)
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