|Message: Re: Neutron Range||Not Logged In (login)|
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On Fri, 15 Dec 2017 16:32:33 GMT, M Sek wrote:
> Thank you so much for your consideration. I am grateful for your reply > and teaching efforts. Using a proton in a Hadr example was just because > of curiosity and I was trying to make it clear for me. > > On the other hand, I tried to run the macros you provide. As you already > mentioned, visual observation makes it more clear for understanding yet > I still aspire to obtain the neutron and gamma ranges in materials. It > is clear that Bethe-Bloch formula is valid for charged particles. Also, > you indicate range or penetration definitions are not so simple for > neutral particles, I also get that. However, there must be a method for > obtaining these values. I am sure Geant4 is capable of doing that. I > just do not know how to use it. I will be so grateful if you could point > a direction for me. >
In Geant4, we call gamma range : 5*totalInteractionLength (e.g. photoelec+compton+conversion) This is reasonable : proba = exp(-5), but somewhat arbitrary. I am not sure this definition is enough for neutron. Another approach is to consider the end of depth edep profile. Sush a plot can be done with TestEm11 for gamma (histo 1) or Hadr07 (histo 10)