|Message: Re: Surface Properties:how to model a diffusive (98%) and absorbing (2%) surface||Not Logged In (login)|
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Please, take a look at the Application Developers Manual's: Source listing 5.2.10 (for example).
You need to specify, in case of the glisur-model and dielectric_metal:
OpSurface -> SetFinish(ground); // for diffuse reflector
and just how diffuse with:
G4double polish = 0.0;
OpSurface -> SetPolish(polish);
The value 0 means maximum roughness with effective plane of reflection distributed as cos(alpha) where alpha is the angle between the unit normal to the effective plane of reflection and the normal to the nominal medium boundary. The value 1 means perfect smoothness. In between the surface is modeled as a bell-shaped distribution in alpha with limits given by:
sin(alpha) = +-(1 - value)
When the value = 0 the distribution of the normal to the surface is ~ cos(theta).
Also, the reflectivity as 0.98 for the range of frequencies in question:
OpSurfaceProperty = AddProperty("REFLECTIVITY",pp,reflectivity,NUM);
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