ACCUMULATION OF PILOT BATCHES OF MEDICAL-PURPOSE ACTINIUM-225FROM A MIXTURE OF THORIUM-228 AND THORIUM-229
Three pilot samples of actinium-225 were accumulated from the mixture of isotopes thorium-228 and thorium-229; their characteristics were defined using alpha- and gamma- spectrometry and atomic emission analysis. The extraction was done in two stages: at the first stage, radium, actiniumand thorium were separated by the anion-exchange chromatography in acetic and nitric acids, the second stage was the additional purification of actinium-225 by the extraction-distribution chromatography.