[Gate-users] Material Database - did not load properties table for material

[Niklas Rehfeld]

Hi Patrick,

> I try to simulate a clearpet neuro and when I set the material of the  
> crystals it works fine for LSO but when I set the material to LuYAP-70  
> there's a warning, althoug I cannot see any difference in the structure  
> of the definition of these two materials:
>
> '/gate/layer0/setMaterial LSO' works fine
>
> '/gate/layer1/setMaterial LuYAP-70' says:
>
> GateMaterialDatabase: did not load properties table for material  
> 'LuYAP-70'.
>      This is only a problem when OPTICAL PHOTONS are transported in this  
> material.'
>
>
> Can I avoid this? Does it matter? Where is the difference in the  
> definition between LSO and LuYAP? I see different elements but apart  
> from that it looks same...

I did not work with optical photons yet, so my explanation might be wrong  
(but I think it isn't :) ).

LuYAP does not show up in the file Materials.xml (as opposed to LSO). That  
is the reason for the warning.

Geant4 is (originally) designed for high energy physics. That is why  
"normal" photons are not reflected by surfaces and there is no refraction.  
Optical photons, however, can.

Hope that helps...


Niklas