Dear Zafar,
from the Manual, description of command USRBIN:
WHAT(1) : scores distribution of one of several quantities in a
regular spatial structure (binning detector) independent from
the geometry.
............................
0.0 <= WHAT(1) <= 8.0: Quantities scored at a point.......
Quantity scored:
.....................................................
- if WHAT(2) = 234 (ACTIVITY) or 235 (ACTOMASS): activity or
specific activity
.....................................................
WHAT(2) : particle (or particle family) type to be scored
.....................................................
If WHAT(2) = 234 (ACTIVITY) or 235 (ACTOMASS), and WHAT(1) < 10,
the binning will score activity or specific activity.
WHAT(1) >= 10 is not allowed.
.....................................................
Notes:
1) A "binning" is a regular spatial mesh..............
...................................................
The following quantities can be "binned":
...................................................
- activity (per unit volume) or specific activity (per unit
mass)
...................................................
10) Activity will be expressed in Bq/cm3 per unit primary weight.
Specific activity will be expressed in Bq/g per unit primary
weight. Scoring activity requires additional commands RADDECAY,
IRRPROFI, DCYTIMES and DCYSCORE.
As you can see, activity can indeed be scored in binnings, but only under
conditions stated in Note 10).
Alberto
On Wed, 8 Jul 2015, Zafar Yasin wrote:
> Dear Sunil,
> Thank you so much, now I understand my output. Can you please comment on my second
> question either USRBIN can be used to score spatial activity from residuals like I am scoring
> residual dose? Paola Sala in a post written that it cannot be used to score a particular isotope but I am
> interested in spatial distribution of total activity.
>
> Best regards,
> Zafar
>
> _____________________________________________________________________________________________________________
> From: Sunil C [csunil11_at_gmail.com]
> Sent: 08 July 2015 09:56
> To: Zafar Yasin
> Cc: Vittorio Boccone; fluka-discuss_at_fluka.org
> Subject: Re: [fluka-discuss]: Residual dose and activity
>
> Dear Zafar
>
> The neutrons produced in a reaction will simply escape from the system, once the beam has stopped.
> For example, a neutron of 0.025 eV (very slow in the neutron world) has a velocity of 2.2 km/s. Indeed, they
> will cover a lot of distance in a very short time span and thus wont be there to contribute to the dose
> anywhere near the origin.
> So, unless you have ultra cold neutrons, you will not see any beta decay, which is what you get even if they
> did hang around long enough.
>
> The photons are still being produced because the material under irradiation has become radioactive and is
> decaying with its characteristic decay constant.
>
> Best Regards
> Sunil
>
> On Wed, Jul 8, 2015 at 12:11 PM, Zafar Yasin <Zafar.Yasin_at_cern.ch> wrote:
> Dear Vittorio and Fluka experts,
> Thank you very much for replying. You mean after one minute of cooling time there will be
> no contribution to residual dose from neutrons? I really not understanding this as neutrons have mean
> life
> of 15 minutes and half life of 10 minutes, and where these neutrons go for this period? If there is
> clearly large contribution from photons after 1 minute of cooling time, there should be
> some contribution from neutrons or not?
>
> Secondly, can you please also comment on my question how can I use ACTIVITY option in USRBIN to see
> spatial distribution of activity as the way we normally use FLUKA is not accepting.
>
> Thank you.
>
> Best regards,
> Zafar
>
> _____________________________________________________________________________________________________________
> From: Vittorio Boccone [dr.vittorio.boccone_at_ieee.org]
> Sent: 07 July 2015 22:13
> To: Zafar Yasin
> Cc: Ferreira De Almeida Lourenco, Ana; Eleftherios Skordis; Joachim Vollaire; fluka-discuss_at_fluka.org
> Subject: Re: [fluka-discuss]: RE: Understanding USRBDX output files
>
> Dear Zafar,
> it would be nice (next time) to start a new thread for your question as it's not completely related to
> Ana's.
>
> I see you have for those cases a very low statistics.
>
> Your "neut-dose" USRBIN is eventually queued though the DCYSCORE card as well, which means - toghether
> with RADDECAY WHAT(1)=1 - that the particle will be scored at the specified cooling time. In your case
> the effects dose caused by neutrons will be negligible. Remove the DCYSCORE card for the neut-dose and
> you will actually have a clear sign of the neutron effects coming from the prompt radiation. For
> scoring both radiation, you should switch to semi-analogue mode.
>
> Best
> Vittorio
>
>
> On Tue, Jul 7, 2015 at 11:58 AM, Zafar Yasin <Zafar.Yasin_at_cern.ch> wrote:
>
> Dear Joachim, Lefteris, and Fluka experts,
>
>
>
> Thanks a lot for giving time, I was doing the same mistake as Ana was doing. Actually, I
> have another problem and I have
>
> stuck at that point. I am doing MC simulations for beam dumps and related shielding using
> FLUKA and everything is ok for prompt beam.
>
> But when I start after irradiation of 200 days and for a few cooling times , I am not
> satisfied with the results I get.
>
>
>
> To prepare my input I exactly followed the lecture of the FLUKA course , 2012, and even run
> the input file that is available on the web.
>
> But when I run my input file, I have a few issues:
>
>
>
> Firstly, I am not seeing anything from neutron contribution, the USERBIN residual dose rate
> plot from neutrons is empty and contribution
>
> from all particles and photons seems not so good, please see attached plots. Plot from
> residual nuclei is not complete too.
>
>
>
> Secondly, LAM-BAS card seems not here or in prompt case, but I was able to get good
> contribution from neutrons by using this card.
>
>
>
> Thirdly, I want to see spatial distribution of activity , I want to use USRBIN card for
> this as in the comment in my input file attached, but
>
> flair seems not happy with this and reply you can't do this way.
>
>
>
> I have attached my input file, is there any problem in the input file or else?
>
>
>
> Thank you!
>
>
>
> Best regards,
>
> Zafar
>
>
>
>
>
>
>
>
>
>
>
> _____________________________________________________________________________________________________________
> From: Ferreira De Almeida Lourenco, Ana [am.lourenco_at_ucl.ac.uk]
> Sent: 07 July 2015 10:55
> To: Eleftherios Skordis; Joachim Vollaire; Zafar Yasin; fluka-discuss_at_fluka.org
> Subject: Re: Understanding USRBDX output files
>
> Dear Joachim, Lefteris and All,
>
>
> Thank you very much for your reply.
>
> That was my problem! I was running several runs with different seed numbers but the RANDOMIZ card
> was set has a comment - well picked up 😊
>
>
> I have another question:
> In the output file, sum.lis, from USRBDX card, results are give in units of steredians and
> degrees. How are the quantities related?
> Many thanks,
> Ana
>
> _____________________________________________________________________________________________________________
> De: Eleftherios Skordis <eleftherios.skordis_at_cern.ch>
> Enviado: 7 de julho de 2015 08:30
> Para: Joachim Vollaire; Zafar Yasin; Ferreira De Almeida Lourenco, Ana; fluka-discuss_at_fluka.org
> Assunto: RE: Understanding USRBDX output files
> Hi both,
> It is most likely that you have no RANDOMIZ card active in your input.
> For Ana, looking at your input file, you have comment the card out and thus getting only the same
> history over and over again.
>
> Kind regards
>
> Lefteris
>
>
> -----------------------
>
> Eleftherios Skordis
> Dep. EN/STI, CERN
> CH-1211 GENEVA 23
> SWITZERLAND
>
> OFFICE: +41-22-7679541
>
> _____________________________________________________________________________________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Joachim
> Vollaire [joachim.vollaire_at_cern.ch]
> Sent: 07 July 2015 09:37
> To: Zafar Yasin; Ferreira De Almeida Lourenco, Ana; fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: RE: Understanding USRBDX output files
>
> Hi
>
> The most likely cause is that you are not differentiating your runs and starting with the same
> random seeds. You are thus computing the error based on the same exact histories and averaged
> means so the variance is zero in that case. You can check it is the case by converting two of
> your data files to ascii and check if they are identical.
>
>
>
> As instructed in the manual you should have a minimum of five independent runs (different random
> seeds) to compute representative errors
>
> Hoping this help
>
> Greetings
>
> Joachim
>
>
>
> From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Zafar
> Yasin
> Sent: 06 July 2015 22:54
> To: Ferreira De Almeida Lourenco, Ana; fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: RE: Understanding USRBDX output files
>
>
>
> Dear Fluka users and Ana,
>
>
>
> I am also facing the same problem but with USRTRACK card, I am not using the URBDX, while I do
> activation
>
> analysis for prompt beam it is ok.
>
>
>
> Best regards,
>
> Zafar
>
>
>
>
>
>
> _____________________________________________________________________________________________________________
>
>
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Ferreira De
> Almeida Lourenco, Ana [am.lourenco_at_ucl.ac.uk]
> Sent: 06 July 2015 11:51
> To: fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: Understanding USRBDX output files
>
>
>
> Dear FLUKA experts,
>
>
>
> I am simulating a proton beam in a target cylinder and scoring fluence differential in energy
> and angle in a ring detector using a USRBDX card.
>
>
>
> For a non zero fluence I'm getting a error of zero. Why is the error zero? Example of sum.lis
> file:
>
> ...
>
> Tot. resp. (Part/cmq/pr) 0.8798609 +/- 0.000000 %
>
> ( --> (Part/pr) 0.8798609 +/- 0.000000 % )
>
> ...
>
>
>
> Also, in the sum.lis files the angular distribution and respective fluence are given in units
> of steradians and degrees. How are these two quantities related?
>
>
>
> Please find attached my input file.
>
>
>
> Many thanks,
>
> Ana
>
>
>
>
>
__________________________________________________________________________
You can manage unsubscription from this mailing list at
https://www.fluka.org/fluka.php?id=acc_info
Received on Wed Jul 08 2015 - 16:06:44 CEST