Dear Alfredo
thank you for clearing that up. Turns out, most of the residual dose was
from cadmium.
sincerely
saurabh
On Mon, Jul 16, 2018 at 10:27 PM, Alfredo Ferrari <alfredo.ferrari_at_cern.ch>
wrote:
> Dear Saurabh
>
> the Fluka neutron library for Tungsten (W) was built from the evaluated
> data in ENDF/B-VII.0, which were the latest data available at that time.
> ENDF/B-VII.0 does not contain data for W-180, hence this isotope is not
> included in the "natural" Tungsten provided with Fluka for neutrons below
> 20 MeV.
>
> W-180 is ~ 0.12% of the natural composition, and since it is not present
> in the Fluka neutron cross section library W-181 produced by radiative
> capture on W-180 will never show up.
>
> Data for W-180 appeared in ENDF/B-VII.1 and ENDF/B-VIII.0 and they will
> likely be included in the updated neutron corss section library in a Fluka
> next release.
>
> Ciao
> Alfredo
>
> +----------------------------------------------------------------------+
> | Alfredo Ferrari || Tel.: +41.22.76.76119 |
> | CERN-EN/STI || Fax.: +41.22.76.69474 |
> | 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
> | Switzerland || |
> +----------------------------------------------------------------------+
>
>
> On Sun, 24 Jun 2018, Saurabh Mukherjee wrote:
>
> Dear experts,
>> I am trying to simulate residual activity due to thermal neutron incident
>> on
>> natural tungsten. The input file is attached, along with the source and
>> spectrum file. The isotopes generated by FLUKA are - W-187, W-185 and
>> Re-187.
>> But when I compare it to online calculator
>> (https://www.ncnr.nist.gov/resources/activation/) (the inputs to the
>> online
>> calculator are shown in attachment 2 and the results in attachment3), the
>> results are different. I see that in online calculator, the W-187, W-185
>> isotopes are present but there are some extra isotopes present as
>> well-W-181, W-188 and Ta-183. These are not present in FLUKA results. Is
>> there some problem with my input file? Can some one please take a look?
>> sincerely
>> saurabh
>>
>>
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Received on Wed Jul 18 2018 - 10:48:51 CEST