Hello
in the input you sent, the target is rectangular with a 5*5 cm surface
(+-2.5 in each direction) , and the beam is annular with a 5 cm radius.
It means that the beam is larget than the target, thus many of the ions
will miss the target ans deposit zero energy in it.
Thus, the fluka result, that is given "per primary" will be
"underestimated " by the ratio of the areas, that is a factor pi (3.14).
Per primary means averaged over all the primaries, including those
missing the target.
The rest of the normalization depends on how you normalize the SRIM
results. This I do not know, but it looks like you have a normalization
the depends on the target surface, which might lead to errors. Maybe it
would be bette to normalize to a unit surface, 1 cm^2, (which you get
directly in Fluka).
Hope it helps
Paola
On 10/17/23 15:46, Warisara Charuchinda wrote:
>
> Dear FLUKA experts,
>
>
> I am a beginner of FLUKA.
>
> I am trying to calculate the stopping power of a 290 MeV/n 12C
> incident on a CR-39 detector (plastic detector).
> The geometry is a simple system with a rectangular target (6 * 6 * 40
> cm^3, CR-39) in vacuum.
> I have calculated the energy deposition (GeV/cm^3 per primary) using
> USRBIN.
> I multiplied the result by the area (36 cm^2) of the plane
> perpendicular to the irradiation direction (i.e., the XY plane) and
> converted the units to GeV/cm per primary.
>
> I also multiplied this by 100 to change the units to keV/um per primary.
> The FLUKA results were compared with the SRIM code. FLUKA results were
> about three times smaller than SRIM results.
>
> (For example, at the target entrance, FLUKA and SRIM were predicted to
> be 5 keV/um and 15 keV/um, respectively.)
>
> Is there a problem with the conversion method? Thank you so much in
> advance for your answer.
>
>
> Best regards,
>
> C.Warisara
>
>
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Received on Tue Oct 17 2023 - 23:22:41 CEST