Re: [fluka-discuss]: Incorrect result

From: Jyoti <jyoti.grg_at_britatom.gov.in>
Date: Sat, 01 Dec 2018 09:34:54 +0530

Dear Francesco,

For 1 Ci Co-60 source (energy 1.17 MeV), I run the program.
Radius of detector: 5cm

The energy deposited is 6.5E-11 and % error is 6.2%.
The dose calculated from this energy deposited is 0.23 R/h.

I am calculating dose form the energy value obtained in 21 card and trying to compare this value with the theoretical one.
The theoretical dose is calculated using the formula (0.52CE/r^2) R/h where E is in MeV, r is in m and C is in Ci. (Here for E=1.17 MeV, theoretical dose is 0.61 R/h).

Kind Regards

Jyoti


On 11/30/18 09:44 PM, Francesco Cerutti <Francesco.Cerutti_at_cern.ch> wrote:
>
>
> Dear Jyoti,
>
> first, note that you do not need a source routine for an isotropic distribution, which is simply available through the BEAM card (WHAT(3)).
>
> Second, what you score in the unit 21 is the energy *deposited* in your detector made of *air* (GeV per emitted photon), while in unit 22 you get a 3D distribution of energy density deposited in air (GeV/cm3 per emitted photon). In principle there is nothing wrong in all that, the point is what you want to compare to, and how you normalize the resulting number.
>
> Kind regards
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
>
> On Thu, 29 Nov 2018, Jyoti wrote:
>
> >Dear FLUKA experts
> >I took a Co-60 point source at (0,0,0) and a spherical detector at 100 cm.
> >Energy: 1.17 MeV, one photon
> >Then I run the file, the result is not even close to the theoretical predicted value.
> >
> >Kindly find the source and input file attached.
> >Please let me know the error.
> >
> >With Regards,
> >Jyoti
> >
> >
>
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Received on Sat Dec 01 2018 - 07:42:43 CET

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