[Gate-users] Problem with Optical Photons Detection !!!

[Gummaluri Venkata Sivasree]

Dear Gate Users,

I have designed a SPECT system with collimator, crystal and PMTs. The macro
is running smoothly in GATE( with the generation of ascii and root files).
The only problem is that I am not able to detect the optical photons at
PMT. The Hits.dat file has optical photons generated, but none of them are
getting detected. I am using "perfect_apd" (dielectric-metal) boundary
between crystal and PMTs.
Please help me in solving out this !!

Thanks,
Siva.
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