Re: shielding for 10 MeV neutrons

From: Francesco Cerutti <>
Date: Fri, 22 Mar 2013 10:46:20 +0100

Dear Saneesh

the exercise refers to a 3.5GeV proton beam impinging on a multilayer
target (H2O-Al-Pb). You will always get a charged hadron - actually
proton - fluence peak at beam energy, especially pronounced if you look at
the boundary between the first layers (from H2O to Al, or even from Al to
Pb). Indeed this is also shown on slide 19 of the scoring lecture (I'm
referring in particular to the material of the last beginner course,,
where you have not to miss the red/green points on the top right corner of
the plot. Still I do not understand the units adopted on your vertical
axis (by the way the colour palette does not apply to a single variable

Kind regards


Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Fri, 22 Mar 2013, wrote:

> Dear fluka users,
> I am using FLUKA software for developing a shielding structure for 10 MeV
> neutrons. As an exercise I started with the examples (ex7.inp) given in
> the course website. I have cross checked the output obtained with the one
> given in the course "scoring.pdf". But in my output spectrum, I am
> getting one more sharp peak at a higher energy range (please find the
> attachments). Please help me to solve the problem
> Thanks and regards
> Saneesh N
Received on Fri Mar 22 2013 - 15:54:19 CET

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