Abstract
The invention submitted provides a method of Ac isolation from a mixture of radium, actinium and thorium, which comprises the following steps: a) the mixture of Ra/Ac/Th is applied to a separation column containing an anion exchanger based on styrene crosslinked with divinylbenzene, wherein the content of the crosslinking agent ranges from 5 to 50 %, preferably 8 to 16% (e.g. Dowex 1x8 - a strong anion exchanger crosslinked with 8% and more with divinylbenzene) in the nitrate cycle and eluted with an elution solution containing a mixture of 0.6 to 0.8 M of an aqueous solution of nitric acid and methanol in volume ratios of nitric acid:methanol = 30: 70 up to 10:90; b) the eluate from the separation column is carried through a stripping column containing a styrene-based anion exchanger crosslinked with divinylbenzene, wherein the content of the crosslinked agent is in the range of 5 to 50%, preferably 8 to 16% (e.g.
Dowex 1x8 - a strong anion exchanger crosslinked with 8% and more with divinylbenzene) in the nitrate cycle and eluted with an elution solution containing a mixture of 0.6 to 0.8 M of an aqueous solution of nitric acid and methanol in volume ratios of nitric acid:methanol = 30: 70 up to 10:90; c) the eluate from step b) containing 226Ra is isolated, preferably for recycling for repeated irradiation, d) Ac and/or Th is washed from the separation and stripping column with an elution solution containing 5 to 10 M of mineral acid and, possibly, at least one complexing agent, preferably a mineral acid of HNO3 and/or HCl. If the output of step d) is a mixture of Ac and Th, it is further divided in the next steps of the procedure.
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