Dear Hakan
The normalization in FLUKA is per primary beam particle. In the case of a radioactive source the normalization is per decay .
Note that the number in the START option is the number of primary particles sampled to calculate the averaged quantities you are interested in. It has nothing to do with the source activity in that case of a beam intensity if you were using protons as primary particle for example. In both cases, this should be taken into account in the post-processing of the results.
Practical example: if you want the dose rate from a 1 GBq source. Take the FLUKA results in pSv / 1e6 * 3600 (to go from pSv per decay -> uSv/h / Bq) x 1e9 (source activity....) to get results for 1 GBq....
Hoping this help
Joachim
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Hakan AKYILDIRIM
Sent: 11 November 2015 14:11
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Number of primaries for a radioactive source?
Dear FLUKA experts & users
For a radioactive source defined (by using HI-PROPE, RADDECAY and DCYCSORE cards), what does "number of primaries" mean? For example, in the decay of Cs-137 both beta and gamma particles are emitted. Assume that I defined 1.0E+6 primaries by START option. What does this number account for? Betas? Gammas? or sum of two?
Sincerely
Dr. Hakan AKYILDIRIM
Süleyman Demirel University
Faculty of Science & Arts
Physics Dept. (Nuclear Physics)
Isparta-TURKEY
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Received on Wed Nov 11 2015 - 17:41:54 CET