Re: problem with usrsuwev

Hi Helmut

I've had a closer look and traced it back to a nuclide charge=43, mass=121
which is produced only in this one run. Passing through usrsuwev is causes
crazy activities in most of the decay chain (121Ag, 121Cd, 121In, 121Sn),
except those where no definite half-life exists in the nuclide chart
(charge=44,45,46, mass=121).

When removing this nuclide from the output of this run (simply setting it
to zero on reading in usrsuwev) everything becomes "normal".

I now wonder if this is due to some error in the decay parameters of this
chain. Maybe Alfredo or Paola can check.

Cheers
Stefan

On Tue, 8 Mar 2011, Helmut Vincke wrote:

>
> Dear colleagues
>
>
>
> When analysing FLUKA binary activation result files with the usrsuwev program a strange
> result occurred:
>
>
>
> I have 5 binary output files which I process with usrsuwev. The usrsuwev and the
> activation binary files are based on the FLUKA version: FLUKA2010 Version 2.0 Sep-10.
>
> I received a very high activation value (irradiation time 1 day, cooling 1day) with a very
> high error (99%), which could be traced back to the nuclide Sn-121. I omitted one of the
> files resulting in a much lower activation value with a very small error. Believing that I
> have a strong fluctuation in the file which I omitted I thought the problem is understood.
> However, when I looked up the production of the two sets of calculations (5 files versus 4
> files) I found out that in both cases the production is identical (within 3%) with an
> error of 2%. Also the production of isotopes in the same mass region, which might lead to
> Sn-121 by decay, are similar in both cases. Could you please explain how it is possible
> that we get very different activation results (factor 1E5) in these two cases although we
> have in both cases similar nuclide production rates.
>
>
>
> For the cooling time of 0s the discrepancy is even larger (several isotopes).
>
>
>
> I attach a tar file with two scripts, one running the usrsuwev with 4 files the other one
> with 5 files. Moreover the 5 binary files and the results are attached.
>
>
>
> Thanks in advance for the answer
>
>
>
> Best regards
>
> Helmut
>
Received on Thu Mar 10 2011 - 08:59:46 CET