Abstract
Excitation functions for Pb-201, Pb-202, Pb-203 and Pb-201m radionuclides which are formed via proton induced reactions with natural thallium target have been measured from their respective threshold (E-thr) to 27.5 MeV using activation technique. Natural copper foils were used to monitor the cyclotron beam. The integral yields (MBq/mu Ah) of the produced radionuclides were calculated from the measured excitation functions. The optimum proton energy range for the production of Pb-203 with low amount of impurities is (16-10MeV) after 5h of EOB. The experimental crosssections for (nat)T1(p,xn) reactions were compared with the cross-sections recommended by the IAEA and with earlier published data when it was possible.