Dear Joey,
You are correct: When the radiation source is a radioactive isotope, ... decay secondaries are sampled over the whole decay time from zero to infinity, and all scoring will refer to the time integral of isotope activity (dose, fluence, current, yield or residual nuclei PER DECAY, not the corresponding rates at particular decay times as it happens in the "activation study" mode). (Note 8 on the BEAM page of the manual).
So, in your case dose is scored in units of GeV/g per decay. To obtain dose in Gy, multiply GeV/g by 1.602176462E-7 and then normalize to the source activity.
Regards,
George
________________________________
From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> on behalf of $B_at_9Uz>M;R(B <yinxiangzi.sheng_at_sphic.org.cn>
Sent: Wednesday, February 27, 2019 6:40:42 PM
To: fluka-discuss
Subject: [fluka-discuss]: RADDECAY in Semi-Analogue mode
Hi$B!$(Beverybody!
I am trying to use RADDECAY card to active Semi-Analogue mode.
Together with DCYSCORE card, I can define the source as a radioactive isotope.
RADDECAY 2.
DCYSCORE -1. alldose1 alldose2 USRBIN
Question is:
When I use USRBIN to score the dose distribution, the result I get from fluka should be accumulated dose at Dt or initial dose rate at D0?
In my opinion the fluka result from USRBIN should be accumulated dose Dt after all isotope finished decay.
Means unit will be Gev/g/p, multiply by 1.602E-7 will be Gy/p, or simply Gy/Bq for isotope. Is this correct?
One of my friend says it is dose rate at D0 for this kind of simulation.
I want to confirm this from experts.
Thanks.
Joey
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Received on Wed Feb 27 2019 - 21:28:17 CET