NUCLEAR-DATA RELEVANT TO THE PRODUCTION OF THE POSITRON EMITTING TECHNETIUM ISOTOPE 94MTC VIA THE MO-94(P,N)-REACTION

Excitation functions were measured by the stacked-foil technique for M o-94(p,xn)Tc-94m, Tc-94g, Tc-93m, Tc-93m,g-reactions from threshold to 18.4 MeV. Thin samples of 93.9% enriched Mo-94 powder of 10 mm diamet er and 3-6 Mg/cm2 thickness were prepared via a sedimentation method. Thick target yields of Tc-94m were calculated from the measured excita tion function, and the levels of radiotechnetium impurities were deter mined experimentally. The optimum proton energy range for the producti on of Tc-94m was found to be E(p) = 13-->7 MeV, with the expected thic k target yield of 54 mCi (2 GBq)/muAh. The isomeric cross section rati o for the isomeric pair Tc-94m,g is discussed.