Date: Tue, 10 Sep 2013 23:47:05 +0000
Dear Sebastian
It is complicated to explain what you observe without the input file. One thing you could do is to ensure that you have used the PRECISIO default, use low energy value for the DELTARAY production threshold and for electrons and photons transport.
Best regards
Joachim
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Sebastian Galer
Sent: 09 September 2013 11:11
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Strange binning in DETECT card [NP]
Classification: NPL Management Ltd - Public
Hi,
I have been using the DETECT card to score the energy deposited in a gas region on an event-by-event basis for a tissue equivalent proportional counter. I have been trying to reproduce some results from a paper published a little while ago for a 2um site size and a cobalt 60 beam.
What I have found is that certain bins seem to get significantly more events than others giving my resulting histogram a somewhat spiked effect! Whilst this could be a physical thing I have a tried changing the settings and seeing what happens and this only occurs under certain circumstances.
For a 1um site size (determined by changing the gas pressure) this effect is not present. For different gas compositions (my own, propane based TE gas from the materials database and air) the same thing occurs when increasing the density.
I did find that if I smooth the spikes I get good agreement with the published shape but I am not sure what is causing it. I have tried changing transport and physics options and nothing seems to change it. I have also tried using a proton beam for different energies but still the same thing occurs. Finally I have tried changing the bins (so using 2 DETECT cards; one for low energy events and and one for higher energy events) and the problem is the same (only in the low energy events card).
Any thoughts would be appreciated.
Thanks,
Seb
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