Untersuchung von Szilard-Chalmers-Reaktionen mit hilfe der Dünnschichtchromatographie

Abstract

After irradiation with neutrons, bariumkryptate nitrate was separated from barium nitrate by thin layer chromatography. The¹³⁹Ba activities in the two fractions were measured. After decay, the relative amounts of stable barium were determined by neutron activation analysis. A formula was derived for the calculation of the enrichment factor directly from the four counting rates. The two components mentioned above, one or the other with¹³¹Ba as tracer, were brought into contact with each other for a moment and then separated by chromatography. The exchange rates indicated that the enrichment had been cancelled to a large degree by isotopic exchange. The procedures, recommended as a test for Szilard-Chalmers targets, were checked out with cobalt(III) acetylacetonate.