Studies on the preparation of a131Ba−131Cs generator

¹³¹Cs has been a useful radionuclide for myocardial scanning and localisation of certain tumors in man. It has a half-life of 9.7 days and the decay product of¹³¹Ba (T=11.6 d). The authors have developed a¹³¹Ba−¹³¹Cs generator based on ion exchange chromatography over hydrous zirconium oxide yielding¹³¹Cs quantitatively and in a pure form. This method can also be employed in any isotope laboratory for the large scale production of¹³¹Cs.