Definition of a rectangular beam

From: Jean-Emmanuel Groetz <>
Date: Fri, 14 Jan 2011 17:44:27 +0100

Dear Fluka users,

I need to compare calculation results from MCNPX and FLUKA with
experiment results from a square iron ions (1GeV/A) beam with a uniform
center of approximately 20 x 20 cm2. The beam fluence is about 8300
ions/cm2 and it is important to have the whole beam because µdishes were
used (with a biological target) and have a smaller size (diameter of
35mm) than the beam size.
MCNPX results and experimental dose are in good accordance (~0.2 cGy),
but not with FLUKA. I believe that my beam profile is wrong.

Should I modify in the subroutine SOURCE some variables to have an
isotropic distribution of ions between -10 cm and 10 cm (both for x and
y axes)?

Thank you in advance for your help.

Jean-Emmanuel Groetz
Laboratory of Physical Chemistry and Radiation
University of Franche-Comte
16, route de Gray
25030 Besancon Cedex
phone: +33 3 81 66 65 07
fax  : +33 3 81 66 65 22
Received on Sat Jan 15 2011 - 00:20:00 CET

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