Re: [fluka-discuss]: About Na-22 production from (n,2n) reaction of Na-23, when activation analysis

From: Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch>
Date: Fri, 15 Jul 2016 15:52:36 +0000

Dear Sung Hun Kim,
I tested that Na-22 are INDEED produced by a 18 MeV neutron beam on a Na-23 target.
There could be some problem in your setup. Maybe you might want to send the input file.
Best regards, luigi

On 15 Jul 2016, at 09:39, Sung Hun KIM <ksh4249_at_hanyang.ac.kr<mailto:ksh4249_at_hanyang.ac.kr>> wrote:

Dear all,

Hi, I am a graduate student at Hanyang University in Seoul, South Korea.
I am evaluating the activity of cyclotron and surrounding structures, when 18 MeV proton is irradiated on H218O target, and I am trying to compare this results with those of MCNP.
In this simulation, I found something curious on activation of Na-23.
In MCNP result, there are Na-22 isotopes from (n,2n) reaction of Na-23, which has pretty high radioactivity.
However, in FLUKA result, Na-22 isotopes are not produced at all.
I found some Q/A in fluka discuss website, that (n,2n) reaction does not occur with neutrons of below 20 MeV, and in FLUKA the compensation of this process will be done by modifying the weight of generated neutrons.
However, in my case, I have to evaluate the activities and the activities of Na-22 isotope from (n,2n) reaction of Na-23 isotope is important.
In this case, does FLUKA compensate the activity of no production of Na-22, too?
If not, how can I evaluate the activity correctly?

Your answer will be a great help in my research.
I am looking forward to hearing from you.

Best wishes,
Sung Hun Kim

------------------------------------------------------------------------------------------------------------------------------
Sung Hun Kim, MS-PhD integrated course
Department of Nuclear Engineering, Hanyang University
222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Korea
Office: +82-2-2220-4057, Fax: +82-2-2220-4054
Cell: +82-10-7242-4249
E-mail: ksh4249_at_hanyang.ac.kr<mailto:ksh4249_at_hanyang.ac.kr>


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Received on Fri Jul 15 2016 - 19:51:47 CEST

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