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Forum: Geometry
Re: Question few percent of an element (Sergio Lo Meo)
Date: 29 Jan, 2014
From: michel maire <michel maire>

On Wed, 29 Jan 2014 10:39:42 GMT, Sergio Lo Meo wrote:
> Dear G4 Experts,
> 
> in my setup, I built a material in which there are small percentages of
> certain elements, for example:
> 
> ...
>  PbF->AddElement(elTi,fractionmass=3.453E-8*perCent);
>  PbF->AddElement(elCr,fractionmass=1.54E-6*perCent);
>  PbF->AddElement(elFe,fractionmass=7.035E-7*perCent);
> ....
> 
> Are these elements really considered by Geant4?
> 
> In the summary of the material (at start up) they are reported with
> percentage of 00.00%...

  Yes, they are ... 
  You can play with setPrecision before to print your material.

> 
> I hope it's just a limitation of the display of significant digits...
> 
> The question came to me studying spallation reactions with protons to
> produce the neutron flux. Many of these elements have big cross sections
> for neutron capture and currently I can not see their contribution in
> the neutron flux output.
> 
  Can you double check with Hadr03 that the reactions you have in mind are really there ?

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