Good day all! I model the response of a HPGe-detector to radionuclide radiation. I have modified example rdecay02 in part of geometry and turn on CorrelatedGamma in BiasedRDPhisics: “deex->SetCorrelatedGamma(true);”, file PhisicsList stay unmodified. I have got a good match with the experimental data for Co-60 and Ba-133. But for the Bi-207 the result is bad. For some reason there is no contribution of 1063 keV - line in the modeled spectrum. There is no full absorption peak, Compton scattering, peaks of single and double escape, peak for 1063 keV + 569 keV = 1633 keV (the most strong and intensive cascade) and etc. Is there some error in modeling from my side or from Geant4 side either? Counting on your help.
I tried to perform a simulation of Bi207 of an HPGe detector and I can confirm that the Geant4 behavior is right. The obtained spectrum is as expected:
I think you have some problems with your code.
In addition to not having the 1063 keV gamma line, I see in your simulated spectrum (blue) a lot of lines that should not be present.
I suggest you:
Check your setup (maybe you can post an image of your geometry)
Check how the deposited energy is collected.
How did you set the primary particle?
You can use /tracking/verbose 2 in order to check what is happening in your simulation (what particles are generated and tracked)
Thank you for your answer, Andrea.
I use extended example Geant4 “RDecay02”. I checked how the deposited energy collected and I finded the deposited energy are collected within a limited period of time from the beginning of the event. I deleted this part of code.
