Dear FLUKA experts, I would like to ask for your help on what is the best way to get Counts vs. LET spectra in a given region. For my test setup, I am shooting protons at a water block target with some polyethylene shielding. I would like to get some information on the Counts vs. LET spectra insid…

Dear @KillMartin , no need for forgiveness, I do not see any crime there. USRYIELD is a good choice to get LET spectra, but it does not apply to a region volume, rather to a boundary surface between two regions, where the energy of a particle and hence its LET are well defined. However, you selected…

Dear Francesco, Thank you for your patience and detailed explanation. I did some experimental runs after some thinking try to understand what you said. However, I still can’t quite get how to use this estimator. So my settings for the USRYIELD is shown below. I am shooting protons at a water block…

I cannot give you a final answer in the absence of your input file, without even knowing your proton energy nor shielding thickness. What I see there is that you look at particles entering the tissue region from the VOID region. Do these regions share a boundary? Where is the latter located with res…

Sorry, you are totally right. I should’ve upload my files. The attached is my .flair file along with the .input file. Test.flair (1.7 KB) Test.inp (1.4 KB)

Hi @KillMartin , the range of your 162 MeV proton beam is slightly shorter that the thickness of the PE region. It might be that no charged particles reach the scoring surface. Hope this could help.

Dear @luillo , I have suspected it might be the case after @ceruttif pointed out that I might have no particles reach the water block. However, there is deposited dose in the water block. So I think this is probably not the case. Thank you for your insight. Martin

Hi @KillMartin you are right, protons get there (although also neutrons could in principle be indirectly responsible for energy deposition, but they are not the dominant ones here). The problem is with the USRYIELD card. Since you selected different Yield types (EMERGING/ENTERING) before moving to…

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Best way to get Counts/LET spectra

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