Patent ID: 7510691
Filing Date: 2009-03-31
Classification: A61N,C01F,C22B,G21G,Y02P

Abstract:
1. A method for purifying Cs-131, comprising the steps of: (a) dissolving neutron-irradiated barium comprising barium carbonate and Cs-131, in a first solution comprising an acid which reacts with the barium to form a soluble barium salt, whereby the barium and Cs-131 are dissolved in the first solution; (b) precipitating the barium as a carbonate solid, whereby the Cs-131 remains dissolved in the first solution; (c) separating the solids from the solution containing the Cs-131; (d) evaporating the solution containing the Cs-131 to incipient dryness to leave a residue; (e) subjecting the residue to oxidative treatment to yield a digested residue; (f) contacting the digested residue with an aqueous solution whereby the Cs-131 goes into the aqueous solution; and (g) separating the digested residue from the solution of step (f), thereby purifying the Cs-131.