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

On Thu, 16 Nov 2017 10:31:31 GMT, Vladimir Ivanchenko wrote:
> 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

Thank you very much for your elaborative answer. I understood that method of defining parameters of a material by myself. I just needed natural Molybdenum as my input material so I was wondering if NIST manager provides me natural molybdenum or not since molybdenum has multiple isotopes?

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