  In this document we present the calculation and experimental validation of a
source term for ${}^{18}$F-production with a cyclotron for medical applications
operating at 18 MeV proton energy and 30 $\mu$A proton current. The Monte Carlo
codes MCNP6 and FLUKA were used for the calculation of the source term. In
addition, the radiation field around the $^{18}$O-enriched water target was
simulated with the two codes. To validate the radiation field obtained in the
simulation, an experimental program has been started using activation samples
which are placed close to the water target during an ${}^{18}$F-production run
of the cyclotron. After the irradiation, the samples are analyzed and the
resulting activation is compared to Monte Carlo calculations of the expected
sample activation. We find good agreement between simulations and experimental
results, with most calculation to experiment (C/E) ratios well between 0.6 and
1.4.
