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1. (WO2017157355) METHOD FOR ISOLATION OF AC FROM MIXTURE OF RADIUM, ACTINIUM AND THORIUM

Pub. No.:    WO/2017/157355    International Application No.:    PCT/CZ2017/050012
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: C22B 3/42
C22B 60/02
Applicants: CESKE VYSOKE UCENI TECHNICKE V PRAZE
UJV REZ, A.S.
UNIVERZITA KARLOVA, PRIRODOVEDECKA FAKULTA
Inventors: KOZEMPEL, Jan
VLK, Martin
MICOLOVA, Petra
KUKLEVA, Ekaterina
FIALOVA, Katerina
KOMANKOVA, Lucie
BAJZIKOVA, Anna
PODLAHA, Josef
SVOBODA, Karel
BURIAN, Patrick
HOFFMANN, Michal
SMRCEK, Stanislav
Title: METHOD FOR ISOLATION OF AC FROM MIXTURE OF RADIUM, ACTINIUM AND THORIUM
Abstract:
The present invention provides a method for isolation of Ac from a mixture comprising radium, actinium and thorium comprising the following steps: a) a mixture of Ra/Ac/Th is loaded onto a separation column containing an anion exchanger based on a styrene cross-linked with divinylbenzene, wherein the content of the cross-linking agent is in the range of 5 to 50 %, preferably 8 to 16 %, in nitrate cycle, and eluted with a solution containing a mixture of 0.6 - 0.8M aqueous solution of nitric acid and methanol in volume ratio of nitric acid solution : methanol = 30 : 70 to 10 : 90, b) the eluate from the separation column is lead through the purification column containing an anion exchanger based on styrene cross-linked with divinylbenzene, wherein the content of the cross-linking agent is in the range of 5 to 50 %, preferably 8 to 16 %, in nitrate cycle, and eluted with a solution containing a mixture of 0.6 - 0.8M aqueous solution of nitric acid and methanol in volume ratio of nitric acid solution : methanol = 30 : 70 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 out from the separation and the purification column by elution solution containing 5 to 10M mineral acid and optionally at least one complexing agent, preferably the mineral acid is HNO3 and/or HCl.