[fluka-discuss]: Re: How to calculate activation cross sections with FLUKA
Dear Oyeon,
please send your questions to the dedicated mailing list here in cc
(which you have to have registered) and not privately.
Your guess is not correct: to calculate specific reaction channels, FLUKA
does not use precomputed cross sections but its own models (PEANUT in case
of single hadron - like neutron - induced reactions). However, low energy
(<20MeV) neutrons represent an exception: in this case residue production
- and neutron transport - is calculated according to library data, that
you can access through the printing flag of the LOW-NEUT card.
Note that the use of FLUKA is not intended to extract microscopic cross
sections, rather to calculate - with respect to your example -
radionuclide yields/activity for a specific geometry.
Kind regards
FrancEsco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Fri, 1 Nov 2013, Oyeon Kum wrote:
>
> Dear Francisco,
>
> I am going to bother you again.
> I would appreciate it very much if you could let me know how to calculate
> activation cross sections with FLUKA, for example, 27Al(n,p)27Mg or
> 27Al(n,alpha)24Na, etc.
>
> I guess that FLUKA may use these activation cross sections inside.
> Then, we can catch it out in one way or the other. I looked for the FLUKA
> manual but I could not find.
>
> Thank you very much again in advance.
>
> Best regards,
> Oyeon
>
>
> 2013/10/29 Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
>
> Dear Oyeon,
>
> if you want to get the isotope production per beam particle, use
> the RESNUCLEi card *with no association to any cooling time*
> (i.e. do no put your RESNUCLEi detector name in any DCYSCORE
> card). Concerning the normalization to the region volume (just
> used as a scaling factor), if you do not specify the latter in
> the RESNUCLEi card the resulting values actually will not be
> expressed per cmc (despite the unit label in the file, assuming
> in this case a default normalizing volume of 1 cmc) but will
> refer to the whole region (nuclei/p in that region).
> To process RESNUCLEi results, use usrsuw.
>
> (Bq is the unit for the activity of radioisotopes *at a given
> time*, which is the product of the radioisotope population at
> that time - depending on build-up [from direct production and
> parent decay] and decay - by its decay constant).
>
> Best regards
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Tue, 29 Oct 2013, Oyeon Kum wrote:
>
> Dear Dr. Cerutti,
> My name is Oyeon Kum, Ph.D. and is calculating
> radiation protection problems
> with FLUKA 2011 code at the Korean Institute of
> Radiological and Medical
> Sciences in Korea.
>
> I want to get Isotopic abundance (nuclei/p unit) of
> the produced nuclei as
> shown in L. Sarchiapone 's LNL Annual Report
> (attached here) about SPES
> project.
> I ran FLUKA code and supportive programs such as
> usrsuw and usrsuwev and
> tried to get the Isotopic abundance of the produced
> nuclei shown in Fig.2
> and Table 1 in his report, but I could not find it.
> Rather, I found the same
> values with different unit, nuclei/cmc/pr and
> Bq/cmc, from usrsuw and
> usrsuwev, respectively. The two results are also
> attached here. The file
> name, "output1_sum.lis" is from usrsuwev and
> "irr1day_61_sum.lis" from
> usrsuw.
>
> I would very much appreciate it if you could let me
> know how to get the
> isotopic abundance data from FLUKA code simulation
> and the meaning of the
> two different units with the same values, if
> possible. Thank you very much
> again in advance for your kindness.
>
> Sincerely,
> Oyeon Kum
> e-mail: okum1211_at_gmail.com; okum_at_kirams.re.kr
>
>
>
>
Received on Sat Nov 02 2013 - 13:07:17 CET
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