Excitation Functions of α-Particle Induced Nuclear Reactions on Highly Enriched 92Mo: Comparative Evaluation of Production Routes for 94mTc

Excitation functions were measured for '^Mo(o,xn)"'^Ru, "Mo(o,p)''«Tc and "Mo(o,pn)'^°«Tc reactions by the stackedfoil technique using 97% enriched '^Mo as target material. The data for the '^Mo(o,p)"«Tc and '^Mo(a,pn)'^-"Tc reactions were determined after a thermochromatographic Separation of the reaction products. Thick target yields were calculated from the measured excitation functions. The levels of isotopic impurities were determined experimentally. The Optimum a-particle energy ränge for the production of '^"Tc via Üie '^Mo(a,pn)'*'"Tc and '^Mo(a,2n)'^Ru '^"Tc routes at the Compact Cyclotron CV28 was found to be = 26 18 MeV. The thick target yield of the '^Mo(o,pn)'^"Tc reaction in this ränge was 63 MBq (1.7 mCi)/nAh. The yield of '^"Tc via the "Ru '^"Tc decay during one hour irradiation amounted to 35 MBq (0.95 mCi)/ HAh. A critical evaluation of the various production routes for '^"Tc is given. The '"Mo(p,n)-process appears to be the method of choice both in terms of *""Tc yield and its radionuclidic purity.