Dear Georgios
Please try with Low mat for H2O bound natural hydrogen to invoke the
S(alpha,beta) treatment and let us know. You are currently using free gas
natural hydrogen at 296K.
Cheers, Sunil
On Thu, Apr 16, 2015 at 2:47 PM, Georgios Tsiledakis <
Georgios.Tsiledakis_at_cern.ch> wrote:
> Dear Sunil,
>
> Thank you very much for your answer...
> I have tested what you proposed and its true that the beam particles dont
> hit the Cobalt target...
> But since they are thermal neutrons, no matter how they are emitting from
> the beam, inside Water they should create a kind of thermal neutron gas
> travelling in all directions and finally hit the thin target...
> My logic was that the presence of Germanium cylinder inside the Water
> volume should absorb many neutrons, resulting at a measured neutron fluence
> in the target smaller than the one without the presence of Germanium...
> What I measured with high statistics was just the one way scoring of
> neutrons from Water towards Cobalt. Surprisingly, the results are the
> opposite I was expecting...
> Is any mistake considering my DEFAULTs settings or any more appropriate
> PHYSIC card that could be used?
>
> Thank you very much in advance
>
> Best regards
>
> Georgios
> ------------------------------
> *From:* Sunil C [csunil11_at_gmail.com]
> *Sent:* 13 April 2015 07:35
> *To:* Georgios Tsiledakis
> *Cc:* fluka-discuss_at_fluka.org
> *Subject:* Re: [fluka-discuss]: Thermal neutron fluence using USRBDX
> scoring
>
> 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 <
> Georgios.Tsiledakis_at_cern.ch> 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 20 2015 - 11:03:12 CEST