Abstract
The feasibility of producing 127Cs- 129Cs mixtures by spallation for use in nuclear medicine was investigated. It is possible to use this mixture since the energies of the principal gamma-ray emissions of both 6-h 127Cs and 32-h 129Cs are similar. Chemical compounds of barium, lanthanum, cerium, praseodymium and neodymium were irradiated with 590-MeV protons; and thin-target cross sections were determined for the formation of the desired 127Cs and 129Cs, and the unwanted contaminants 132Cs and 136Cs. Cross sections for the formation of 127Cs, 129Cs, 132Cs and 136Cs from praseodymium, which gave the purest 127Cs- 129Cs from the five targets irradiated, were 49 ± 8, 58 ± 8, 0·23 ± 0·06 and 0·011 ± 0·008 mbarn, respectively. The total 132Cs- 136Cs contamination 24 h after the end of a typical irradiation was 0·08 per cent of the 127Cs- 129Cs activity. Ge(Li) spectra showed that the chemical procedure used quantitatively removed all non-cesium radioactive impurities.
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