Abstract
Relations were obtained for calculating the concentrations of impurity isotopes of starting nuclides 98Tc, 127I, 133'134'137Cs in recycling 99Tc, 129I, 135Cs targets, respectively. Conditions of removing 98Tc from the transmutation cycle in a single irradiation run were found. The content of 127I in the targetattains an equilibrium value, thus making unnecessary isotopic separation of iodine. For isotopic separation of cesium, a decrease of the initial content of 137Cs in the 135Cs target to 1% is sufficient. The 133Cs and 134Cs nuclides preserve steady-state concentrations for a long period, and for this reason the activity grows insignificantly, depending on the 137Cs accumulation, which makes unnecessary isotopic separation of cesium from irradiated targets.
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