A Simple Estimate of Production of Medical Isotopes by
                Photo-Neutron Reaction at the Canadian Light Source

                                Barbara Szpunar
                          University of Saskatchewan

Abstract:
We employed FLUKA Monte Carlo code along with the simulated photon flux for a
beamline at the Canadian Light Source in conjunction with a CO2 laser system.

The photon intensity can not be modeled in FLUKA yet. S. Data from Spring 8,
Japan, simulated the photon flux for the laser back scatter systems at the CLS.
The Klein-Nishina formula was used to calculate back scattered photons energy
distribution.

This calculated parabolic shape of photon energy distribution is not included as
a standard shape of source in Fluka. Therefore user routine needs to be used in
modeling transmutations for this source. Alternatively one can use FLUKA to
calculate transmutations for a narrow energy width for which the standard source
can be used. The activities of 99Mo, 192Ir and 196Au were than calculated using
EXCEL. The induced activities were calculated using Bateman equations and
weighted residuals according to the shape of the source.