Re: Score of steady neutron fluence

From: Francesco Cerutti <>
Date: Mon, 30 Jul 2012 15:41:59 +0200

Dear Guojun Hu

what you get from FLUKA is neutron fluence per primary event [cm-2], where
the latter is an impinging beam particle, the emission of a neutron from
your own source, a cosmic ray, (a decaying isotope, which however in
FLUKA will not produce neutrons) or the interaction between two colliding
particles, etc
Now, if your neutron source has a given rate [emitted neutrons per
second, i.e. s-1], you have just to multiply as postprocessing stage the
above FLUKA result by that rate, getting your steady neutron fluence [cm-2



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

On Sat, 28 Jul 2012, wrote:

> Dear FLUKA experts,
> Thank you for your kind answer to my previous questions!
> I run into another confusion about the score of FLUKA simulation. I refer to an simple
> problem to describe the confusion. For example, there is a point neutron source at the center
> of an sphere which contains some material, such as water or other. Assuming that the source
> strength is the same all the time, we can say that there is an steady neutron fluence at any
> point in the sphere. Then, in "normal" calculation, I didn't consider the time information
> (time information is not included in SOURCE card, or the age of source neutron in the
> subroutine source.f is ZERO )and got the score of neutron fluence. My question is: does
> this result represent the steady neutron fluence as discussed above?
> Thanks in advance!
> Guojun Hu
Received on Mon Jul 30 2012 - 17:01:46 CEST

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