Source term and shielding calculations for the installation of a new cyclotron for medical applications at HZDR

In the presentation results for source term and shielding calculations for the installation of a new cyclotron at the Helmholtz-Zentrum Dresden-Rossendorf are given. This cyclotron will be used to produce radioisotopes for medical applications. The source terms for a proton beam hitting an18O-enriched water target were calculated with MCNP6 and FLUKA, and compared to source terms used in the literature for exclusive18O(p,n)18F production. It was found that the additional channels which are present during the cyclotron operation may not be neglected. In addition, a significant contribution from gamma-radiation produced by the proton beam in the water target was taken into account. Based on the results from the Monte Carlo simulations, theestimated dose rates in public areas around the cyclotron building are significantly below the allowed limits provided by the legal authorities.
To validate the radiation fields obtained in the simulations, an experimental program has been started using activation samples originally used in reactor dosimetry. These samples are placed at well defined positions in the radiation field, and after irradiation are analyzed for residual activation. The results can then be compared to the simulated results. We will present the status of this program.