Re: secondary neutron fluence

From: Alberto Fasso' <>
Date: Wed, 24 Jul 2013 16:21:55 +0200

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.


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 24 2013 - 17:25:02 CEST

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