Hi HoSeung,
1 - Please re-read my previous TWO messages.
2 - The absorbed dose (Gy) in air is going to be very very different (much lower) from that of your final target. Thus, the result in air is not extrapolable to your future targets.
3 - Yes, if you simulate 1E17 primaries it will take you too long, but why do you want to use so many primaries?
4 - As to how to transform FLUKA results to Gy/min, again, please refer to my first email
5 - Yes, if you reduce the number of primaries you will still get statistically significant results. If you run several jobs, FLUKA will provide error bars on the merged results so that you can assess the convergence of your calculation. However, your results may still not be credible (see point 2).
6 - I recommend you the following reading:
https://indico.cern.ch/event/365567/timetable/#20150511
http://www.wiley.com/WileyCDA/WileyTitle/productCd-352740760X.html
- Mario
From: HoSeung Song <genesjp_at_skku.edu<mailto:genesjp_at_skku.edu>>
Date: Wednesday, June 3, 2015 9:58 PM
To: Mario Santana <msantana_at_slac.stanford.edu<mailto:msantana_at_slac.stanford.edu>>, fluka-discuss <fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>>
Subject: Re: [fluka-discuss]: Dose calculation (Unit: Gy/min)
Dear Santana,
Thank you for your reply. As I told you, my interest is to simulate dose in Gy/min.
The target is now fixed yet. It should be a certain object such as bag, box, and etc. But for now lets say the absorbed dose in air. How can I calculate absorbed in Gy/min.
If I simulate a 10E15-16 primary particle number, it seems that simulation time will be so large, is there some way to simulate such kind of large primary numbers?
What if I reduce a number of primaries and do the same simulation. can we believe those results?
Thank you and sorry for your incovenience.
Regards,
Ho-seung Song
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 - 09:36:28 CEST