MOSSBAUER-SPECTROSCOPY INVESTIGATIONS AND BEHAVIOR OF IMPURITY ATOMS IN IRRADIATED METALLIC TARGETS

The properties of hot atomic microimpurities ((CO)-C-57,58, Mn-54) in cyclotron metallic targets were investigated using the reaction Mn-55 + alpha with emission Mossbauer spectroscopy employed to estimate the electronic state of the hot atoms. gamma-Radiation self-absorption and sectioning methods were used to define the diffusion coefficients at 670-1200 K. The position of the Co-57 atoms in the manganese lattice a fter irradiation and subsequent heating at the temperature of polymorp hic alpha-->beta manganese (1000 K) transformations was established. R apid diffusion of cobalt atoms at the polymorphic alpha-->beta mangane se transformation was revealed. The radiochemical behaviour of Co-57,C o-58, Mn-54 after target dissolution was studied. The conclusion arriv ed at is that hot impurity atoms are a very effective tool in investig ations of metallic cyclotron targets.