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 Mon Jul 16 2018 - 20:17:31 CEST