Abstract
Se-75 (T-1/2=120 d), Se-73g (T-1/2 = 7.1 h) and Se-72 (T-1/2 = 8.4 d) are important radioisotopes of selenium, beingused in tracer studies, PET investigations and as a generator parent, respectively. Cross section data for the formation of those radionuclides in proton and deuteron induced reactions on As-75 were critically analyzed up to about 70 MeV. A well-developed evaluation methodology was applied to generate the statistically fitted cross sections, based on the critically analyzed literature experimental data and the theoretical cross section values of three nuclear model codes ALICE-IPPE, TAYLS 1.9, and EMPIRE 3.2. Using the fitted cross sections the integral yield of each radionuclide was calculated. For the estimation of impurities, the integral yield of each radionuclide was compared with the yields of the other two radionuclides over a given energy region, and there from the energy range was suggested for the high purity production of each of the radionuclides Se-75, Se-73 and Se-72. For production of the very important non-standard positron emitter Se-73 via the As-75(p,3n)Se-73 reaction, the optimum energy range was deduced to be Ep = 40 -> 30 MeV, with a thick target yield of 1441 MBq/mu Ah and the Se-72,Se-75 impurity level of <0.1%.