Re: [fluka-discuss]: Dpa Results

From: Paola Sala <paola.sala_at_mi.infn.it>
Date: Mon, 21 Jun 2021 10:49:08 +0200

yes


On 6/21/21 9:21 AM, Tshepo Mahafa wrote:
>
> Dear Paola,
>
> Thank you so much. It makes perfect sense.
>
> As a follow up to your last line: “If you need only a global value
> over your target, you can set a USRBIN with only one interval for each
> of the coordinates”
>
> Do you mean that instead of binning my material in the Z coordinate
> into 50 like I did, I can bin it once, which will cover the whole size
> of the sample.
>
> And that will give me the global dpa over the target.
>
> Kind Regards,
>
> Tshepo
>
> *From:*Paola Sala [mailto:paola.sala_at_mi.infn.it]
> *Sent:* 17 June 2021 04:52 PM
> *To:* Tshepo Mahafa; 'fluka-discuss_at_fluka.org'
> *Subject:* Re: [fluka-discuss]: Dpa Results
>
> Hello
>
> The 1Dmax  chooses for each z interval the cell in R with the maximum
> value of the scored quantity (or vice-versa,  if the projection is
> done along R)
>
> The 1D projection for each z interval AVERAGES  all the cells in R. 
> Either over the whole mesh, or in a selected interval if the user
> sets  limits on the coordinates  in the plot page.
>
> Thus, I would expect the 1Dmax to be higher than the 1dprojection.
>
> Which value to use depends on what you need.. if you need a global
> quantity or an estimate in  the most affected point.
>
> Beware, both of them depend on how you set the USRBIN mesh with
> respect to the size of the beam and of the subsequent particle shower.
>
> If you need only a global value over your target, you can set a USRBIN
> with only one interval for each of the coordinates. Or average over
> the 1Dprojection values of your present binning
>
> Regards
>
> Paola
>
> On 6/2/21 9:13 AM, Tshepo Mahafa wrote:
>
> Dear Fluka Experts,
>
> I have a copper disc of dimensions, 1.5 mm radius and 5 mm
> thickness that I want to know what would be the damage effect of
> neutrons on it.
>
> So I simulated with FLUKA the dpa using USRBIN DPA-SCO. I
> simulated the coper disc being bombarded by three neutron
> energies, 1 keV, 1MeV, and 10 MeV so as to compare them.
>
> This were done on separate input files, but I have the input file
> of one attached.
>
> I have three questions that relates to this, and I’ll appreciate
> it if you could help me understand the results.
>
> Questions:
>
> 1.Can you please check if my input file is correct and I did not
> miss anything concerning estimating dpa
>
> 2.I plotted the dpa results using 1D Max and 1D Projection in
> USRBIN. The results are different. The 1D Max results are larger
> than that of the 1D Projection. What result should I use
>
> for dpa between the two.
>
> 3.Generally, dpa results are given as one value like for example,
> 2 dpa. So how do I get to this one value that describes the dpa
> the whole material experienced.
>
> That is all from me. Thanking you in advance for your help.
>
> Regards
>
> Tshepo
>
> *Tshepo Mahafa*
>
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>
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>
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Received on Mon Jun 21 2021 - 12:23:16 CEST

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