Re: [fluka-discuss]: Residual activity distribution

From: Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch>
Date: Wed, 19 Aug 2015 06:48:32 +0000

Dear Zafar,
I do not see any issue in your input in relation to the activity in air.
However, please bear in mind that the statistical convergence in air needs much more CPU than for the dump
or walls (with almost 1e9 events I barely reach 30% statistical uncertainties).
Therefore there’s no much sense to show activity in air. On the contrary, I would rather set a minimum in the color scale that
corresponds to values in the activity map with a statistical error less that 10 %
(you can give a look to this thread<http://www.fluka.org/web_archive/earchive/new-fluka-discuss/4910.html> in the FLUKA mailing list for some guidance).

Best regards, luigi

On 14 Aug 2015, at 14:26, Zafar Yasin <Zafar.Yasin_at_cern.ch<mailto:Zafar.Yasin_at_cern.ch>> wrote:

Dear Luigi,



Please see attached with colour scale.



Best regards,
Zafar



________________________________
From: Luigi Salvatore Esposito
Sent: 14 August 2015 08:53
To: Zafar Yasin
Cc: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: Re: [fluka-discuss]: Residual activity distribution

Dear Zafar,
there is no color scale in the second plot you've sent.
Could you post it again with the color scale?
Thanks, luigi

On 13 Aug 2015, at 18:07, Zafar Yasin <Zafar.Yasin_at_cern.ch<mailto:Zafar.Yasin_at_cern.ch>> wrote:

Dear Luigi,



Thanks for replying. I attached same simulations, almost same geometry, beam energy, current, etc, from another group in file Nt_gp.docx and you see my activity distribution and their 's are
entirely different. They have no activity in the room whereas in my case activity is distributed all over the room. I don't know why this is happening
and my input file seems ok and is also attached here with. Will you please see is there anything wrong happening or my simulations are ok?



Thank you in advance.



Best regards,
Zafar





________________________________
From: Luigi Salvatore Esposito
Sent: 13 August 2015 17:25
To: Zafar Yasin
Cc: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: Re: [fluka-discuss]: Residual activity distribution

Zafar,
yes, it’s correct for your second question.
Not sure about what you want to ask in your first point?
Could you possibly be more clear?
Thanks.
Best regards, luigi


On 13 Aug 2015, at 13:41, Zafar Yasin <Zafar.Yasin_at_cern.ch<mailto:Zafar.Yasin_at_cern.ch>> wrote:




Dear FLUKA experts,



I am simulating residual activity distribution for 320 MeV electron, 1.0E13 #/sec, beam dump and related experimental area using FLUKA.
The USRBIN plot I get is shown below. The distribution of activity is in the material objects, beam dumps and walls, etc
and also in the room where there is only air. Is it possible to have distribution like this as in my previous simulations
of 20 MeV gammas the activity distribution was only in the beam dumps and in the walls. I have also seen a few
reports where there was no activity distribution in air although they have energy and beam current comparable to I am using.



<a320_plot03.jpg>



Secondly, in the output file part pasted below, I just want to confirm, total activity is 63023.37 Bq/cm3 and
activity of isotope 82Pb209 is 83.2 Bq/cm3, is it correct?



Decay time : 60. s
Detector n: 1 resNuc4
(Region 2 Volume: 785.39801 cmc,
distr. type : 3 ,
Z_max: 86, N-Z_max: 49, N-Z_min: -4)
Tot. response (Bq/cmc) 63023.3789 +/- 0.0986103192 %
( --> Bq 49498436. +/- 0.0986103192 % )

 

 

**** Residual nuclei distribution ****
**** (Bq/cmc) ****

 

 

A \ Z 76 77 78 79 80 81 82 83 84 85 86
209 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 8.32E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00
+/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 1.2 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 %
207 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 6.31E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00
+/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 7.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 % +/- 0.0 %
206 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.81E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00



Thank you in advance,



Zafar Yasin
<a320_plot03.jpg>

<NT_gp.docx><a320.inp>

<NT_gp.docx>


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Received on Wed Aug 19 2015 - 10:21:09 CEST

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