Re: [fluka-discuss]: Error percent

From: P. Taherparvar <p.taherparvar_at_guilan.ac.ir>
Date: Mon, 28 Jan 2019 22:49:22 +0330 (IRST)

Dear Dr. Andrea Fontana,
Thanks for your response.
I have attached the corresponding input file. Indeed, I want to calculate the statistical error (uncertainty) in dose output for each of scoring rings.

Best Regards,
Payvand




----- Original Message -----
From: "Andrea Fontana" <andrea.fontana_at_pv.infn.it>
To: <p.taherparvar_at_guilan.ac.ir>, fluka-discuss_at_fluka.org
Sent: Monday, January 28, 2019 2:55:03 PM
Subject: Re: [fluka-discuss]: Error percent

Hello,
    the error calculation depends on the binning chosen for the
USRBIN card (e.g. cartesian, spherical...) and also by its
granularity (you might have low statistics or empty bins).
In Flair, which projection did you choose the get the output
file (1D, 1d max)? Also make sure you enter the region volume
when scoring dose.

Regarding the splitting of the runs with SPAWN, this works since
it creates different cycles on the different cores of your CPUs:
however the suggested way is to use the cycle number in the
Flair button panel.

If you send your input file, we can cross check the results.

This threads can be helpful:

- http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10107.html
- http://www.fluka.org/web_archive/earchive/new-fluka-discuss/8955.html
- http://www.fluka.org/web_archive/earchive/new-fluka-discuss/8955.html

Kind regards,
Andrea


> Dear FLUKA expert,
>
> I want to calculate the uncertainty in dose calculation.
> I used FLUKA code (with flair) and USRBIN card, with 10^7 primary and
> SPAWN:5.
> In output results, Column 4 in text viewer in flair is related to the
> dose error.
> As I saw in flair course, this error expressedin "percent".
> For example, I have; dose: 0.00848 and error (Column: 4 in output):
> 0.042. With this results,Is dose uncertainty about
> 0.04%?.the/uncertainty/is/too small!!!/
> Further, what isuncertainty in the cross-section data?

-- 
========================================================================
Dr. Andrea Fontana                    tel: +39 0382 987991
Istituto Nazionale                    fax: +39 0382 423241
di Fisica Nucleare
Sezione di Pavia                      e-mail: andrea.fontana_at_pv.infn.it
Via Bassi 6                           web   : www.pv.infn.it/~fontana
27100 PAVIA, Italy
========================================================================




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Received on Mon Jan 28 2019 - 21:41:28 CET

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