Dear Fluka users,
Further to my previous message last week, I have still problems to
assess the dose deposited by heavy ions in a cell culture.
Anna and Francesco (thanks to them) show me the right way to define a
rectangular beam (especially the delta x and y parameters).
To get the deposit dose in the cell culture (inside a ยต-dish), I use
USRBIN with the dose option. I have noticed that if I change the volume
of the region corresponding to the cell culture, it has no effect on the
dose result.
I would like to know if I misunderstand something :
- dose result is given in GeV/g/primary
- energy deposition is given in GeV/cm3/primary
- since the dose is in J/kg, the mass (or the volume) of the region
should have an importance.
In the attached example (Si ions at 600 MeV/A, 24480 ions/cm2, 20x20cm2
for the beam size), the dose is about 0.8 cGy (the experimental dose is
~0.2 cGy and my MCNPX calculations give 0.27 cGy). For Fe ions (1 GeV/A,
8323 ions/cm2, same beam size), the dose from Fluka is the same, i.e.
0.8 cGy (good news!!), but it's still not the expected result, i.e 0.2
cGy.
What I am doing wrong or what I have forgotten ?
Thanks in advance.
Jean-Emmanuel
-- _____________________________________________ Jean-Emmanuel Groetz Laboratory of Physical Chemistry and Radiation University of Franche-Comte 16, route de Gray 25030 Besancon Cedex France mailto: jegroetz_at_univ-fcomte.fr phone: +33 3 81 66 65 07 fax : +33 3 81 66 65 22 ______________________________________________
This archive was generated by hypermail 2.2.0 : Wed Jan 26 2011 - 18:38:02 CET