|Message: Re: creating MLI (multi layer insulation)||Not Logged In (login)|
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Hello, the example of description of complex gaseous materials is in $G4INSTALL/examples/extended/electromagnetic/TestEm8 For composite materials the same approach can be applied but you need to know atomic composition and density of the material. There are two ways to prepare compound material description: 1) certificat from vendor company may have details (usually not); 2) a peace of material is analyzed by atomic spectroscopy to know atomic composition; the weight and surface are measured; thickness of this material is not constant, so you may use an approximate value, density of the material reconstructed from measured surface, weight, and this thickness. There is an extra problem with such material: because thickness if not strongly fixed, transmission of particle flux via such material has additional smearing. I personally do not know measurements of transmission via such material but it would useful to perform if not yet done. VI