Re: secondary neutron fluence

From: Anton Artamonov <>
Date: Fri, 26 Jul 2013 13:04:02 +0300

Hello all!

Many thanks, Alberto and Stefan

In attachment, you can see good spectrum in my case. it was counted by
Geant4. There are nice two peak. In my case, I have bad, first peak
(on LOW-NEUT curve).

I'm treining use USRTRACK, but spectrums are identical. Also, there is
absent a thermal evaporation peak, how it you can see on the spectrum
with low-mat.

Quoting Alberto Fasso' <>:

> Hi Anton,
> USRCOLL has a very limited range of application. It can be used only for
> neutrons (and indeed you used it for them) but it is very inefficient
> in low-density materials (and cannot be used at all in vacuum). You used
> it in air, which I would not recommend.
> In the cases where it can be used efficiently, it gives results identical
> to USRTRACK: therefore USRTRACK is to be preferred, because it can be
> applied to all particles, and it works even in vacuum.
> Alberto
> On Tue, 23 Jul 2013, Anton Artamonov wrote:
>> Hello all!
>> I am trying to compute secondary neutron fluence produced by primary
>> protons with given energy in a compound target with FLUKA 2011.2b.3
>> using FLAIR.
>> The USRCOLL is used in order to score the neutrons. A LOW-NEUT option
>> is applied. The geometry is rather simple, however there is a gap in
>> the computed spectrum, also spectrum is not realistic (Please see
>> attachment)
>> Please help me.
>> The input files is attached

Received on Wed Jul 31 2013 - 16:25:44 CEST

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