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None Defining LYSO material 

Forum: Geometry
Date: 07 Nov, 2008
From: Gumplinger Peter <Gumplinger Peter>

I have the following specification: Lu2O3 81% Y2O3 5% SiO2 14% by weight. I made my life easy and snooped in GATE's material data base where I found the fractional masses of each atom in LYSO.

  //Define Lu2O3

  elements.push_back("Lu");  fractionMass.push_back(0.311015340);
  elements.push_back("Y");   fractionMass.push_back(0.368765605);
  elements.push_back("Si");  fractionMass.push_back(0.083209699);
  elements.push_back("O");   fractionMass.push_back(0.237009356);

Now, these numbers in fractionMass were calculated by hand.

I don't know the density of Lu2O3 etc. but am I allowed to define Lu2O3 etc with some/any value for the density, then use them in a mixture of mixtures, where the fractionMass are those specified by the manufacurer as above to define LYSO. For LYSO I'd then give the correct density. Would that work? How about defining 'molecules' in G4 which we can then use to assemble materials?

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