Kambali, I. Astarina, H. Huda, N. Ismuha, R.R. Kardinah, K. Listiawadi, F.D. Marlina, M. Parwanto, P. Rajiman, R. Suryanto, H. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-MOP13 English 83-86 MOP13 target proton cyclotron positron radioactivity Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-MOP13 http://jacow.org/cyclotrons2016/papers/mop13.pdf An 11-MeV proton-accelerating cyclotron has been employed to produce F-18 and Tc-99m radionuclides. In this report, F-18 radionuclide was produced from enriched-water target whereas Tc-99m was generated from natural molybdenum trioxide (MoO3) target. Two recoiled radioactive impurities such as Co-56 and Ag-110m are identified in the F-18 solution whereas N-13 was recognized as an impurity in the Tc-99m production. The Co-56 radionuclidic impurity is presumably sputtered off the havar window in the target system whereas Ag-110m is originally from a silver body housing the enriched water target which is generated by secondary neutron irradiated Ag-10⁹. In addition, N-13 impurity found in the post-irradiated MoO3 target occurs presumably via (p,He-4) nuclear reaction.