Dear Riya,
I'd share your expectation if your photons were travelling in vacuum, but
their interactions with your air hemisphere depend on their energy.
Also, make sure that the statistical error of your fluence values is
reasonably low.
As a side note, in your source routine, when typing any real number put it
in double precision (e.g., 1.0D0/3.0D0, or - in this specific case - the
available FLUKA parameter ONETHI).
Kind regards
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. +41 22 7678962
fax +41 22 7668854
On Wed, 27 Jun 2018, riya dey wrote:
>
> Dear FLUKA Experts,
>
>
>
> I was modelling a hemispherical cloud source ( radius = 10 m) emitting
> photons isotropically. Below the cloud, a detector is placed at ( 0,0,200
> cm) with radius R= 200 cm. Now, using USRBDX surface crossing fluence rate
> is estimated in the detector. If we change the energy emitting from the
> source , lets say for 0.1 MeV , 0.5 MeV , 1 MeV , then although the fluence
> distribution with energy is different , the total no of particles crossing
> the detector surface should be nearly same. But total fluence from FLUKA
> results are different for different energy.
>
>
>
> What might be the reason for this ?
>
>
>
> The input files for 0.1 MeV is attached here. The outputs (sum.lis) for 0.1
> MeV and 0.5 MeV are :
>
>
>
> Total fluence per cmq per primary for 0.1 MeV is = 3.59 E-7 (one-way
> scoring) , for 0.5 MeV is = 4.73 E-8 (one way scoring)
>
>
>
>
>
> With regards,
>
> Riya Dey
>
>
>
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Received on Fri Jun 29 2018 - 03:06:51 CEST