Dear @nadeeraBUL2020,
I guess that you managed to calculated the energy deposited on average in the detector by your gamma ray source, thanks to USRBIN per region.
I understand you aim now to calculate the energy deposition spectrum. To this purpose, rather than EVENTBIN (requiring your own post-processing), you may profit from DETECT, which was discussed in several posts on this forum.
As a more complex step, energy deposition scoring can be altered run-time by any response function (as the Birks law applied automatically to USRBIN/EVENTBIN by TCQUENCH) that one can implement on his own in the comscw.f user routine.
The explicit generation of scintillation photons, as a result of energy deposition in scintillator materials, is also possible, thanks to OPT-PROD, but is far from being a beginner task.