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icon4.gif  Gas mixture composition (WMAT). [message #11723] Thu, 28 April 2011 14:56
Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino
first-grade participant

From: *pv.infn.it
Hi all,
in the file media_pnd.geo there are some gas mixtures created using the volume percentages of each element and others using the mass percentages.
I asked for a confirmation also to Mohammad and he redirected me to this link:
http://fairroot.gsi.de/General/Geo_Material_def.htm
where it is stated that the WMAT has to be the mass weigth.

For this reason, for example, the air which now is:
0.78 N, 0.21 O, 0.01 Ar (% in vol)
should be istead:
0.755 N, 0.231 O, 0.014 Ar (% in mass)
I will change this. (done)

I could not look at all the materials also because I don' t know which ones are still in use and which ones are not, but I would kindly ask the other developers to please check their detector materials to be sure that they are all correctly defined.

Thank you very much,
Lia.

[Updated on: Fri, 29 April 2011 17:31]

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