Re: [fluka-discuss]: Proton Bragg peak in water

From: Alberto Fasso <>
Date: Thu, 25 Jun 2015 11:51:02 +0200

Dear Marine,

at 2 GeV, protons produce a hadronic cascade, and do not have a definite
range that terminates into a Bragg peak.

If you are interested in particle energies, you have two possibilities:

1) do not use USRBIN but for instance USRTRACK or USRBDX, which give
    you a particle energy spectrum in an energy range that you can choose
2) use USRBIN, but setting some condition discriminating the particle
    energies by means of the user routine FLUSCW. But since you are a
    beginner FLUKA user, I would not encourage you to do that yet. User
    routines are mainly for advanced users


On Thu, 25 Jun 2015, Marine Huault wrote:

> Dear all,
> I ma Marine, "a newer”
> I am starting to use FLUKA and to learn it I am doing simple examples.
> For example I am comparing FLUKA results  for proton Bragg peak in water at
> different energies with the data of NIST (PSTAR). I have good agreement for
> proton energies until to 300 Mev (see attached file example 200 Mev) and
> within this range I see clearly the Bragg peak. For energies above this
> value the energy deposition change and the Bragg peace start to disappears.
> For example for 2 GeV protons energy (see attached graph)  the graph seems
> more similar to electron deposition. 
> Is there any physics in the code that i am not accounting for ? 
> In addition I would like to ask how I can select the particle energy in
> which I am interested.
> To let you know now i am using the USRBIN card but I cannot find the way to
> discriminate the particle energy.
> I have similar problems also with electrons but let go step by step. 
> regards 
> Marine 
> ------------------------
> Marine Huault
> Scientist
> Building M5. Science Park USAL
> Calle del Adaja, 8.
> 37185 Villamayor, Salamanca. SPAIN
> [uc?export=download&id=0B3jS7D5DWgwiYUlrMGRJOXBWODQ&revid=0B3jS7D5DWgwiZlpL
> TEZaN3g3bkU3OE5yZWEydkJuNnZhL3o4PQ]

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Received on Thu Jun 25 2015 - 13:11:39 CEST

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