Re: [fluka-discuss]: Model beam target which contains multiple radioactive materials

From: Anna Ferrari <a.ferrari_at_hzdr.de>
Date: Sat, 26 May 2018 00:49:48 +0200

Dear Katsuya,
   yes.... I was implicitly assuming that the dose rate from the radioactive
target was negligible compared with the dose rate due to the activation
induced by the high energy proton beam, thing that can be easily not true.
Then you have found the solution. You have to use two separate runs: one
with the primary proton beam and the radioactive material as target, one
describing the radioactive material as source.
In this way you do a conservative calculation, because in the second case
you consider also the radionuclides of the source that in reality transmuted
in something else because of the irradiation... but I think that thanks to
the simulation with the primary proton beam you can extract the number of
radioactive nuclei that disappeared by transmutation, and then normalize the
intensity of the source in the second simulation (at least, I would try to
do this).

Hope
it helps,
Anna




Am Fri, 25 May 2018 13:50:39 +0000 schrieb Katsuya Yonehara :
>Dear Anna,
>
>Thank you so much for your prompt response.
>I am still confused. I think FLUKA can model a radioactive source by using the BEAM card.
>For instance, if I set SDUM=ISOTOPE in the BEAM card, assign HI-PROPE, and set SDUM=CYLI-VOL in the BEAMPOS card, then I can define a radioactive source. The momentum of the BEAM card is zero (shown in slide 21 in your link https://indico.cern.ch/event/604018/contributions/2435668/attachments/1395470/2242783/19_Activation_2017.pdf).
>However, once I used the BEAM card, I cannot use another BEAM card to define the primary protons.
>
>One possible solution I have is that I execute the primary beam run and the radioactive source run separately then integrate the residual dose later.
>
>Sorry for my unclear question.
>Hopefully, you get my issue now.
>
>With

best,
>Katsuya
>
>
>From: Anna Ferrari <a.ferrari_at_hzdr.de>
>Date: Friday, May 25, 2018 at 8:11 AM
>To: Katsuya Yonehara <yonehara_at_fnal.gov>, "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
>Subject: Re: [fluka-discuss]: Model beam target which contains multiple radioactive materials
>
>
>
>Dear Katsuya,
>
> I think we have to go out of the confusion a bit...
> You have a primary beam of 440 GeV protons hitting a target containing several radioactive materials. Therefore you have to use the card BEAM  *only* to describe the impinging protons  (maybe you were confused because FLUKA has the possibility to model radioactive beams, but this is a *completely* different case!). Then you build your geometry and you assign to the modeled regions all the materials/compounds you have. 
>Please find help in the online material of the FLUKA courses... (
http://www.fluka.org/fluka.php?id=courses&sub=ALL)
>
>Here what you need first:
>https://indico.cern.ch/event/604018/contributions/2435680/attachments/1395445/224274/05_Basic_Input_2017.pdf
>
>After that, in order to be able to evaluate the residual dose rates, give a look at the activation lecture:
>https://indico.cern.ch/event/604018/contributions/2435668/attachments/1395470/2242783/19_Activation_2017.pdf
>
>Hope it helps,
>Anna
>
>
>Am Thu, 24 May 2018 20:01:45 +0000 schrieb Katsuya Yonehara :
>>Dear FLUKA experts and communities,
>>
>>My primary goal is evaluating a residual dose after smashing 440 GeV protons into a beam target.
>>I’ve met an issue to model the target which contains several radioactive materials.
>>I used the BEAM command to model the target.
>>However, it seems to define single radioactive element.
>>Besides, in order to define the primary beam, I need to
use another BEAM commands.
>>It seems not to be allowed in FLUKA.
>>What is the best solution?
>>I would appreciate for your help!
>>
>>Regards,
>>Katsuya
>>
>>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Dr. Anna Ferrari
>Institute of Radiation Physics
>Helmholtz-Zentrum Dresden-Rossendorf e.V.
>Tel. +49 351 260 2872
>a.ferrari_at_hzdr.de
>http://www.hzdr.de
>
>Vorstand: Prof. Dr. Dr. h. c. Roland Sauerbrey, Dr. Ulrich Breuer
>Vereinsregister: VR 1693 beim Amtsgericht Dresden
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dr. Anna Ferrari
Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf e.V.
Tel. +49 351 260 2872
a.ferrari_at_hzdr.de
http://www.hzdr.de

Vorstand: Prof. Dr. Dr. h. c. Roland Sauerbrey, Dr. Ulrich Breuer
Vereinsregister: VR 1693 beim Amtsgericht Dresden


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Received on Sat May 26 2018 - 02:12:04 CEST

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