Question about the deviation

From: lzfneu <lzfneu_at_live.com>
Date: Mon, 02 Apr 2012 16:27:24 +0200

Dear Fluka users,

I have a question to consult you:

I want to calculate the absorbed dose and the energy deposition of my shielding material
"fpz8" for 252Cf neutron source.

After I run 998 cycles with the number of prima! ry histories 5e-6, the absorbed dose that reads from the file
"fpz8-clone_usrbin_24.lis" is: 1.2784E-07 GeV/g and the percentage statistical errors is 4.9307E-03%;

the energy deposition that reads from the file "fpz8-clone_usrbin_25.lis" is: 2.8547E-07 GeV/cm3
and the percentage statistical errors is 4.9309E-03%.

Now, I am confused that

A) whether the absorbed dose value deviation is +/-1.2784E-07กม4.9307E-03% GeV/g
or is just +/-4.9307E-03% GeV/g when drawing the error bars.

B) whether the energy deposition value deviation is +/-2.8547E-07กม4.9309E-03% GeV/cm3
or is just +/-4.9309E-03% GeV/cm3 when drawing the error bars.

If the deviation is just the percentage ! statistical errors,

My question is why the percentage statistical errors are so large? Is my calculation right ?

I have attached my input and output files.

Thanks in advance and any help will be appreciated!

Z.F. Lee

Received on Mon Apr 02 2012 - 17:04:26 CEST

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