YIELD OF SE-73 FOR VARIOUS REACTIONS AND ITS CHEMICAL-PROCESSING

Excitation curves for the formation of 73Se by the following reactions were measured up to proton energy of 50 MeV and 3He- and α-particle energies of 40 MeV, together with those for byproduct formation reactions: (1) 75As (p, 3n) 73Se, (2) Ge + 3He → 73Se, and (3) Ge + α → 73Se. The proton reaction has proved to be much superior to the other reactions both in yield and product purity. Volatilization of 73Se from a solution of condensed polyphosphoric acid was found to give an excellent method of 73Se separation from various arsenic targets without carrier. Also, solvent extraction of red selenium 73Se with a minute amount of carrier was shown to be useful separation method. © 1979.