Re: [fluka-discuss]: Thermal neutron fluence using USRBDX scoring

From: Sunil C <>
Date: Mon, 13 Apr 2015 11:05:42 +0530

Dear Georgios

I see that your beam is directed towards the positive Z, while your Co is
somewhere in the -Y half. Thus the beam is not going anywhere near your
cobalt. If you plot a USRBIN data containing the beam particles, you can
see that this is indeed the case. I have attached such a plot. The
difference in your 2 plots or the numbers you report do not seem to be
very much and I suspect is due to statistical fluctuations. With 14-18%
uncertainty, I will be very cautious with any conclusion.

Change your beam direction to point towards the -Y region and try.

Cheers Sunil

On Fri, Apr 10, 2015 at 4:19 PM, Georgios Tsiledakis <> wrote:

> Dear fluka experts,
> I have a cylinder of H2O and a beam of thermal neutrons that hits on it...
> Inside the water cylinder there is a small thin box made of Cobalt
> (target) which
> is next to a Germanium cylinder...
> Using USRBDX scoring -one way- , I would like to demonstrate that the flux
> of neutrons from H20
> that hit the Cobalt target is smaller with the presence of the germanium
> cylinder.
> But the results as you can see at the attached picture are the opposite...
> Why is that?
> Is any other way to conclude concerning the effect of Ge in the neutron
> flux on the Co target?
> Thanks a lot in advance
> Best regards
> Georgios

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Received on Mon Apr 13 2015 - 09:25:27 CEST

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