Date: Fri, 13 Sep 2019 14:46:55 +0000
Thank you very much for your response.
What specific card should I use to take into account nuclear interactions? I am using the HADROTHERAPY defaults. Please find attached the input file I am simulating.
Thank you
Best regards,
Daniela
From: Miller, Arielle <arielle.miller_at_bison.howard.edu>
Sent: 13 September 2019 15:17
To: Daniela Botnariuc <daniela.botnariuc_at_npl.co.uk>
Subject: Re: [fluka-discuss]: RE: Stopping powers of protons in water - thin layer
Are you taking into account the nuclear stopping power? At low energies, protons can interact with the nuclei of atoms. This effect becomes insignificant above 1 MeV. If you look at what NIST provides (i assume you are looking at PSTAR) you can see that at low energies the nuclear stopping power is a significant (albeit smaller) contribution to the total stopping power. At energies above 1 MeV the electronic stopping power dominates and the electronic stopping power becomes equivalent to the total stopping power.
It would be interesting to compare the equations and the correction factors used in the DETLARAY database to the PSTAR database as well which may also play a role in why you are seeing larger discrepancies at low energies.
Arielle
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On Fri, Sep 13, 2019 at 10:12 AM Daniela Botnariuc <daniela.botnariuc_at_npl.co.uk<mailto:daniela.botnariuc_at_npl.co.uk>> wrote:
Dear FLUKA experts,
I would really appreciate any suggestion on this matter.
Thank you.
Kind regards,
Daniela Botnariuc
From: owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it> <owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it>> On Behalf Of Daniela Botnariuc
Sent: 10 September 2019 16:56
To: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: [fluka-discuss]: Stopping powers of protons in water - thin layer
Dear FLUKA experts,
I am calculating stopping powers for protons by simulating the energy deposited by a single proton in a thin layer of water (using USRBIN by region). I am simulating this for each proton energy in the NIST spreadsheets. I want to compare the results obtained with this method with the values from the DELTARAY output and from NIST. For proton energies higher than 1 MeV, this method works perfectly and the results have very small differences when compared to the values from the output or from NIST. However, for low energies, the results show large discrepancies (see figure). How can I correct this? Please find attached the input file I am using to simulate this problem.
Thank you all in advance.
Kind regards,
Daniela
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Regards,
Arielle J. Miller, P.E.
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