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I have to set up a model of a Linac head. The simulation has to quantify the amount of scattered photons generated in the Linac.
Processes that cause scattered photons in the radiotherapy energy range are Compton (prevailing) and Rayleigh. Since I deal with 15 MeV and 18 MeV Linacs, the probability for photonuclear interactions in the high-Z material of some Linac components is greater than zero. Therefore, I also have to quantify the contribution of the gamma rsys produced by events like (gamma, neutron), (gamma, proton) , ...
My question is: what is the name of the photonuclear events used by GEANT4 ?
I apologize for the naive question. I do not use GEANT4 very often. I use mainly Topas (built on GEANT4). Topas has keywords to identify the physicsl processes like "eBrem", "annihil", "Decay" ,"eIoni", "hIoni", "compt", ... Topas uses the same keywords as GEANT4. I just would like to know the keyword used by GEANT4 to identify photonuclear events.
Thank you very much for your help.
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Kind regards, maura