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Dear Masume, You would not need a separate sensitive detector for each square. You can define the Si ‘square’ as a logical volume and assign a single SD to it. ( And define a different one for the SiO2 ’squares’. ) Each copy of this Si volume in the geometry should/could have a separate copy number. Then you can use the copy number to store the energy deposit in a different bin of an array/vector, depending on the copy number. The numbering scheme for the bins of the SDs would need to be a bit more involved if you use a more complicated geometry (e.g. replicas for a strip of ‘squares’ and then individual copy numbers in each volume in a strip. ) But the concept would remain. Maybe this would not work for some particular scheme. But I cannot think of one right now. If so could you please explain the obstacle(s) ? Best regards, John =================================================== John Apostolakis, EP Department, CERN On 5 Feb 2018, at 08:12, masume soleimaninia <email@example.com<mailto:firstname.lastname@example.org>> wrote: *** Discussion title: Geometry Dear Experts, Hello I want to define a repeated volume as Sensitive Volume composed of small squares filled with Si and SiO2 and I intend to expose it with protons and then I want to calculate the mass and the charge of generated particles and energy deposition of them in whole volume not in each square. I mean I don't want to define each square as sensitive detector. would you please guide me how to define the volume? I hope I could clarify the question. Thanks in advanced ------------------------------------------------------------- Visit this GEANT4 at hypernews.slac.stanford.edu<http://hypernews.slac.stanford.edu> message (to reply or unsubscribe) at: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1567.html [ MIME part of type text/html without a name stripped ]