Abstract
Because of the cost and limited availability of isotopically enriched thallium (>92%203Tl), its use in the203Tl(p, 3n)201Pb nuclear reaction necessitates chemical recovery. An adaptive method has been developed and evaluated. After the separation of201Pb, the203Tl(I) is oxidized to203Tl(III) by Cl2, Br2 or [Fe(CN)6]−2, precipitated as Tl(OH)3 with NaOH and subsequently converted to Tl2O3 by heating. Due to potential loss during recovery, the solubilities of Tl(OH)3 and Tl2O3 in aqueous solution as a function of pH have been studied using the internal tracer202Tl (T=12.2d), produced during cyclotron irradiation. Effective solubility product constants have been determined to be 5.4·10−48 and 2.5·10−47 for Tl(OH)3 and Tl2O3, respectively.
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