[fluka-discuss]: Proton elastic nuclear interactions in water

From: Joakim da Silva <jd491_at_cam.ac.uk>
Date: Fri, 29 May 2015 11:59:12 +0100

Dear Fluka users,

I am simulating beams of protons in the therapeutic energy range
(~70-250 MeV) impinging on a water tank and am trying to separate the
dose contribution from protons that have suffered only electromagnetic
interactions from that of protons and other species that have been
involved in nuclear interactions. This far I have been scoring BEAMPART
together with delta ray production switched off to get the dose from
primary particles. However, if I understand things correctly, elastic
nuclear interactions do not change the particle generation, and
therefore protons that have undergone such interactions are still
counted as BEAMPART. This leads me to a few questions:

1) Is there an easy way to separate out the dose from beam particles
that have undergone also elastic nuclear interactions? I am interested
mainly in elastic interactions with hydrogen if this makes a difference.

2) Assuming the above is valid also for elastic interactions with
hydrogen, how is it determined which of the resulting protons is the
beam particle, i.e. is it by highest energy, random, or something else?

3) In a previous thread it is mentioned that no distinction is made
between elastic and nonelastic interactions for neutrons at low
energies, and thus that both increase the particle generation. Does this
apply also to protons, and, if so, what is the energy threshold?

Many thanks in advance for your help!

Best regards,

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Received on Fri May 29 2015 - 14:34:12 CEST

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