[Gate-users] Regarding attaching a system to photomultiplier tubes in a SPECThead

[open researcher]

Hi gate users!

I have built a SPECThead with a collimator, NaI crystal and an array of PMT
. I have attached sensitive detector to PMT.

I have defined SCINTILLATION YIELD for NaI, REFRACTIVE INDEX for PMTs
material (Glass) in materials.xml (so that optical

 photons generated in the crystal will be detected in PMT) and used a
opticaladder digitizer. But my interfile image is blank

and ascii singles.dat is empty (but ascii hits.dat is full with events).

I think the problem is, PMT is not attached to the SPECThead system  (base
or crystal or pixel).
                                                    *I don't know to what
level of the SPECThead system should  I  attach PMTs*
any help?

THANKS IN ADVANCE
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