Use of Deq

From: Sunil C <>
Date: Wed Apr 02 2008 - 12:20:30 CEST

Hi Stefan

On processing the USRTRACK outputs using ustsuw.f I get two results in
the *_sum.lis.
one has unit p/cmq/pr and the other cm/pr. While computing dose
equivalent using the deq99.f the correct one will the integral one as I
suppose the deq.f will be folding the fluence with the conversion
coefficients bin by bin?
So the cm/pr should be the one giving the pSv/primary?
Am I right?
What does the p/cmq/pr give in terms of pSv?

Best Regards
Stefan Roesler wrote:
> Hi Sunil,
> I don't have NCRP 144 and IAEA 188; thus can only comment on your input:
> - Photonuclear interaction are off by default. Therefore, you'll have to
> uncomment PHOTONUC.
> - deq99c.f does not apply to USRYIELD.
> - Thus, the only card which folds with dose-equivalent factors in your
> input is USRTRACK. Is this the dose output which you are refering to?
> - You are correct, results are in pSv/primary.
> - I'd recommend using EMFCUT (both for production and transport
> thresholds) so that you are sure of your cutoffs.
> - I guess that you have verified in the output file that deq99c folding
> was indeed applied?
> I take the liberty to cc fluka-discuss as the discussiuon might also be of
> interest to others (or know a better answer).
> Regards
> Stefan
> On Mon, 31 Mar 2008, Sunil C wrote:
>> Hi Stefan
>> I am having a normalization problem in a work of mine.
>> Attached is a typical input where I use a cylindrical detector after a certain
>> shield thickness to score photon dose using deq99.f routine.The primary beam
>> is electron incident on 10 radiation lengths thickness of several targets. I
>> vary the shield thickness and score the dose. On plotting the dose rate after
>> shield against the shield thickness, the well known transmission curve can be
>> obtained. I get a neat graph except of course at the higher thickness.
>> Extrapolating the graph to zero thickness should give the unshielded dose
>> rate. I am comparing this with the NCRP 144 (figure 3.5 page 45) and Swanson's
>> IAEA tecdoc 188. I am getting results 100 times lesser unshielded dose rate
>> with FLUKA calculations compared to the Swanson's rule of thumb given in IAEA
>> 188 (page 53).
>> Am I making a mistake while calculating the dose equivalent?
>> I understand the units are in pSv/primary.
>> Your comments will help me debug the problem.
>> Thanks a lot
>> Best Regards
>> Sunil
Received on Wed Apr 2 15:14:02 2008

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