[Gate-users] Spect pin hole collimator

[MauroNappa at libero.it]

Dear all
My name is Mauro and I have been working on gate since two weeks so far. 
gate is not very easy for me and I need to construct a pinhole collimator geometry, but I can't understand how to write the volume about the pinhole.
Can anyone help me or give any general suggestion to me.
Thank You very much 
Kind Regards
Mauro
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