Excitation functions of Ge(p,xn)As reactions from threshold up to 45 MeV for production of the non-standard positron emitter As.

Nuclear reaction cross sections for the formation of As and As in proton-induced reactions on enriched Ge targets were measured up to 45 MeV utilizing three different cyclotrons at the Forschungszentrum Jülich. The stacked-thin sample activation technique in combination with high-resolution γ-ray spectrometry was used. The major γ-ray peaks of As and As formed via the Ge(p,n)As and Ge(p,2n)As reactions, respectively, were analyzed.

Density reduction effects on the production of [11C]CO2 in Nb-body targets on a medical cyclotron.

Medical isotope production of C is commonly performed in gaseous targets. The power deposition of the proton beam during the irradiation decreases the target density due to thermodynamic mixing and can cause an increase of penetration depth and divergence of the proton beam. In order to investigate the difference how the target-body length influences the operation conditions and the production yield, a 12 cm and a 22 cm Nb-target body containing N/O gas were irradiated using a 13 MeV proton cyclotron.