Hi Roman,
the result is not correct because the units are correct :)
Please give a look on the scoring lecture from our last course:
https://indico.cern.ch/event/442634/contribution/12/attachments/1184625/1716758/07_Scoring_2015.pdf
The output of FLUKA is normalized per primary particle (since you are also asking NO-NORM) in your GCR-SPE card.
So you have a USRBIN giving Gy/pr and a USRBDX giving the particles/cm2/pr
Dividing these two quantities just cancels the primary beam information as you correctly say you get rid of it.
However then it gives a quantity of Dose vs fluence, which tells nothing about your incoming spectrum!
Forget the information from the USRBDX and simply take the dose Gy/pr and multiply with with the
incoming flux of particles then you will get Gy per the total number of particles of your event.
Cheers
Vasilis
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Roman Savinov [rsavinov_at_calpoly.edu]
Sent: Thursday, February 11, 2016 07:00
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Conversion factor to get dose from USRBIN output
dear Fluka experts,
I am scoring dose with USRBIN. It has output of GeV/g/pr.
Multiplying this by 1.062e-7 gives Gy/pr (manual-USRBIN-note 5).
Now, to get rid of the primary, I divide by the flux (found in the output file) to get (Gy)*(cm^2)
Dividing by the area of the detector should give me Gy but the numbers Im getting is in the order of 10^-13 which is obviously too small given the GCR source and the target (in space) is a cylinder of water 30 cm long shielded by 3.7 cm of Aluminum.
What do I do wrong?
thank you,
Roman
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Received on Thu Feb 11 2016 - 17:47:14 CET