Re: RE: [fluka-discuss]: activation simulation by two-step method

From: Yao <yangyao15_at_mails.ucas.ac.cn>
Date: Tue, 9 Apr 2019 15:21:38 +0800 (GMT+08:00)

Dear Matto,

Thank you for your advice. I have try the first method using the usrrnc.f to score my residual nuclei. However, no files genarated as expected and shows 'STOP: TIM1O2-ISOMER-NOT FOUND' in the .out file. I have attached the input file. A simple calculation is conducted in the example, the residual nuclei in target and air is scored. Could you give me some advices? Moreover, the irradiation condition (irradiation time and beam intensity) is not defined in the example, I know it should be defined with the IRRPROF card. Should this card together with DCYTIMES card defined in the second step?

Best regards,

Yao




 

-----原始邮件-----
发件人:"Matteo Magistris" <Matteo.Magistris_at_cern.ch>
发送时间:2019-03-27 19:10:25 (星期三)
收件人: Yao <yangyao15_at_mails.ucas.ac.cn>, fluka-discuss <fluka-discuss_at_fluka.org>
抄送:
主题: RE: [fluka-discuss]: activation simulation by two-step method



Dear Yao,

 

There are at least two ways to apply a two-steps method for the shielding design.

 

The first way is the one that you describe, where you can use the usrrnc.f user routine to write out all the residual nuclei created in your simulation into a file. Indeed, it is called every time a residual is produced (as long as you have your USERWEIGH card). You can find some hints on how to perform a two-steps method in Fluka in one of the lectures of the advanced course (see “Two steps Exercise 5”)

 

https://indico.cern.ch/event/489973/timetable/#20160511

 

Alternatively, you could set up a two-step approach within one single set of simulations. You can simulate both material activation and the decay of radionuclides produced with RADDECAY. When you simulate the decay, you can make other surrounding materials “disappear” with ASSIGNMA – this way you can see the dose-rate which comes directly from your target, beam dump etc without the contribution from surrounding materials/objects. You can use this dose-rate to design the thickness of your lead glass window, or to compare with the results from the two-steps method with usrrnc.f - so that you are sure that everything is working smoothly.

 

Yours,

Matteo

 

 

From:owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> On Behalf Of Yao
Sent: 22 March 2019 10:41
To: fluka-discuss <fluka-discuss_at_fluka.org>
Subject: [fluka-discuss]: activation simulation by two-step method

 

Hello evergyone,

  I am learning the two-steps method for the shielding design of the highly activated components in accelerator, such as target, beam dump, degrader, etc. For example, in the first step, the induced activity in the target will be scored and the output will be saved into a user routine (usrrnc.f? I am not sure for this).Then,in the second step, the target will be placed in a shield container (lead, iron, etc.), and the thickness must be evaluated in order to protect the personnel. Also, sometimes the components will be transported to the hot cell. The thickness of lead glass window or concrete wall needs to be calculated.I found rarely information about this in FLUKA discuss archive or FLUKA courses. Could anyone give me some examples or advices ?

Best regards

Yao



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Received on Tue Apr 09 2019 - 10:53:47 CEST

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