Contribution of Photoelectric, Compton and Pair Production to Energy Deposition

[ArghyaC]

Versions

Please provide the used software versions.

FLUKA: 4-5.1
Flair: 3.4-3

Description

I have one cylinder made of Silicon. Photon of varying energy is incident on it. I want to score energy deposition inside the cylinder due to photoelectric, Compton and Pair Production. How to do it ?

Thanking you in advance.

Input files

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

[udo.friman-gayer]

Hi @ArghyaC!

EMFCUT might be helpful for you, but one needs to be aware of how it works. To quote from the manual:

This is of course non-physical and it is provided primarily for particular studies where the user wants to switch off selectively a physical process.

For example, when you set a very high production threshold for pair production to “disable” the process, you will not get the correct energy deposition due to interactions (photoelectric effect, Compton scattering) of the secondary ~511-keV photons either. In general, electromagnetic cascades in a medium are complex, and I am not sure how helpful it would be to have access to the information you are asking for.

I can recommend the following thread where the problem of scoring “the dose due to photons” (not specific photon processes like you want) is discussed.

Calculation of absorbed dose for gamma rays and fast neutrons in a fixed energy range

Dear David, To give you a satisfying answer to your question we would like to point out a preliminary consideration: in reality, all energy deposition is performed by electrons. It is always important to keep this in mind, when working with artificial filtering methods like the AUXSCORE card. In fact, with the latter, the energy deposition is attributed to the particle undergoing an interaction (e.g., a neutron or a photon) if the products of the latter - which are the ones actually responsible…

Best regards,

Udo