Hi Amit,
I am not sure what leads you to think that a large number of particles is needed for that calculation. I certainly did not mention any specific number of primaries. Please review my answer to HoSeung where I merely describe what normalization is needed to translate FLUKA results into something meaningful for the problem in question.
By the way I don't think that such calculation is going to take excessive amounts of CPU.
- Mario
From: Amit Kumar <amit.live.sal_at_gmail.com<mailto:amit.live.sal_at_gmail.com>>
Date: Wednesday, June 3, 2015 9:36 PM
To: Mario Santana <msantana_at_slac.stanford.edu<mailto:msantana_at_slac.stanford.edu>>
Cc: HoSeung Song <genesjp_at_skku.edu<mailto:genesjp_at_skku.edu>>, fluka-discuss <fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>>
Subject: Re: [fluka-discuss]: Dose calculation (Unit: Gy/min)
Hi HoSeung, Santana
How much time it would take to simulate such huge number of primaries? Is there any way to do fast simulation for such large number of primaries?
On Wed, Jun 3, 2015 at 10:16 PM, Santana, Mario <msantana_at_slac.stanford.edu<mailto:msantana_at_slac.stanford.edu>> wrote:
Hi HoSeung,
Results are normalized per primary (in your case per incident electron).
Thus, to normalize your results per minute you need to multiply those by 7.5E12 x 250 * 60:
Results 7.5E12 e 250 pulse 60 s
----------- x --------------- x --------------- x -----------
e pulse s min
Please note that Gy is the unit for absorbed dose density [J/kg], so you should score it in your target of interest, not in air (unless you want to know the absorbed dose in air).
From: HoSeung Song <genesjp_at_skku.edu<mailto:genesjp_at_skku.edu>>
Date: Wednesday, June 3, 2015 7:26 AM
To: fluka-discuss <fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>>
Subject: [fluka-discuss]: Dose calculation (Unit: Gy/min)
Dear Fluka users,
I am conducting a simulation with 15 MeV electron beam to tunsgen target to generate photon and neutron. After the target, I put conical shape collimator to focus the photon. I want to calculate a photon dose (Gy/min) at the certain distance from the target (example: 1m, 2m, 3m and etc.).
1. For a input card, I used USRBIN (dose-eq), AUXSCORE (photon) to score the photon equivalent dose, and the unit is pSv/primary. Is this true?
The specification of the accelerator is as follows;
- number of electrons per pulse: 7.5*10^12
- pulse frequency: 250Hz
- pulse duration: 6us
With these parameters, I want to calculate a photon-dose (Gy/min) with FLUKA. I am a beginner of this program and this field. Can you tell me how to calculate Gy/min at certain point (or surface) with a little bit detail?
Thank you in advance.
Regards,
Ho-seung SONG
--
Amit Kumar
Scientist
Bhaha Atomic Research Centre
Mumbai
Phone No. : 022-25592841
Mobile Number: 9969799819
Alt. Email Id. amitkumar_at_barc.gov.in<mailto:amitkumar_at_barc.gov.in>
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Received on Thu Jun 04 2015 - 08:14:12 CEST