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Title: Method of separation of yttrium-90 from strontium-90

A method for purifying Y-90 from a Sr-90/Y-90 "cow" wherein raw Sr-90/Y-90 source containing impurities is obtained from nuclear material reprocessing. Raw Sr-90/Y-90 source is purified to a fresh Sr-90/Y-90 source "cow" by removing impurities by addition of sodium hydroxide and by removing Cs-137 by further addition of sodium carbonate. The "cow" is set aside to allow ingrowth. An HDEHP organic extractant is obtained from a commercial supplier and further purified by saturation with Cu(II), precipitation with acetone, and washing with nitric acid. The "cow" is then dissolved in nitric acid and the purified HDEHP is washed with nitric acid and scrubbed with either nitric or hydrochloric acid. The dissolved "cow" and scrubbed HDEHP are combined in an organic extraction, separating Y-90 from Sr-90, resulting in a Sr-90/Y-90 concentration ratio of not more than 10(E-7), and a metal impurity concentration of not more than 10 ppm per curie of Y-90. The separated Y-90 may then be prepared for delivery.
Inventors:
 [1];  [1]
  1. (Richland, WA)
Issue Date:
OSTI Identifier:
870395
Assignee:
Battelle Memorial Institute (Richland, WA) PNNL
Patent Number(s):
US 5512256
Contract Number:
AC06-76RL01830
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA
Country of Publication:
United States
Language:
English
Subject:
method; separation; yttrium-90; strontium-90; purifying; y-90; sr-90; cow; raw; source; containing; impurities; obtained; nuclear; material; reprocessing; purified; fresh; removing; addition; sodium; hydroxide; cs-137; carbonate; set; aside; allow; ingrowth; hdehp; organic; extractant; commercial; supplier; saturation; cu; ii; precipitation; acetone; washing; nitric; acid; dissolved; washed; scrubbed; hydrochloric; combined; extraction; separating; resulting; concentration; ratio; 10; e-7; metal; impurity; ppm; curie; separated; prepared; delivery; concentration ratio; impurity concentration; removing impurities; sodium hydroxide; hydrochloric acid; sodium carbonate; nitric acid; organic extractant; nuclear material; source containing; y-90 source; organic extraction; raw sr-90; containing impurities; /423/

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