[fluka-discuss]: RE: spectrum normalization and actual dose

From: 委v鋱k Aleksandras <aleksandras.sevcik_at_ktu.edu>
Date: Wed, 30 Jan 2019 07:21:33 +0000

Dear all,
It seems that my question most likely unclear, so let me rephrase it to be more specific and technical:

When scoring PHOTONS using usrbin region, do you get the total or average photon number in the region for that specific simulation? Then total number of photons in the region can be get by integrating usrbin photon x-y-z scoring?

A.

From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> On Behalf Of 委vcik Aleksandras
Sent: Friday, 25 January, 2019 01:13
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: spectrum normalization and actual dose

Dear experts,

I would like to get the actual dose values from the simulation and want to know if the approach below is valid.
I am using source.f to generate realistic x-ray beam from specialized x-ray simulation software which gives me the spectrum and fluence. Integrating it I can get the estimated actual number of photon, let's say 10E7. In the simulation I can use USRBIN for all regions to score the overall number of photons detected in the simulation, let's say 10E2. So in the same simulation I can use this factor 10E7/10E2 for dose values as well to get the actual dose values for the specific x-ray tube.
I have tried to run the test simulation with 100x100x100 water cube in the vacuum. In the beginning I was integrating usrtrack fluence energy spectrum but later saw that usrbin region photon scoring gives the same value. So multiplying usrbin total dose value by this fluence actual/simulated factor and converting it to Gy gives me around 7E5 Gy - as it was expected from 80 kvp *1 mAs_at_1meter x-ray beam.
However if this approach is not valid, I would appreciate any comment what would be the correct way to do this.

Regards
Alexander


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Received on Wed Jan 30 2019 - 10:01:03 CET

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