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Title: High specific activity silicon-32

A process for preparation of silicon-32 is provided and includes contacting an irradiated potassium chloride target, including spallation products from a prior irradiation, with sufficient water, hydrochloric acid or potassium hydroxide to form a solution, filtering the solution, adjusting pH of the solution to from about 5.5 to about 7.5, admixing sufficient molybdate-reagent to the solution to adjust the pH of the solution to about 1.5 and to form a silicon-molybdate complex, contacting the solution including the silicon-molybdate complex with a dextran-based material, washing the dextran-based material to remove residual contaminants such as sodium-22, separating the silicon-molybdate complex from the dextran-based material as another solution, adding sufficient hydrochloric acid and hydrogen peroxide to the solution to prevent reformation of the silicon-molybdate complex and to yield an oxidization state of the molybdate adapted for subsequent separation by an anion exchange material, contacting the solution with an anion exchange material whereby the molybdate is retained by the anion exchange material and the silicon remains in solution, and optionally adding sufficient alkali metal hydroxide to adjust the pH of the solution to about 12 to 13. Additionally, a high specific activity silicon-32 product having a high purity is provided.
Inventors:
 [1];  [2]
  1. (Los Alamos, NM)
  2. (Santa Barbara, CA)
Issue Date:
OSTI Identifier:
870451
Assignee:
United States of America as represented by United States (Washington, DC) LANL
Patent Number(s):
US 5525318
Contract Number:
W-7405-ENG-36
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
specific; activity; silicon-32; process; preparation; provided; contacting; irradiated; potassium; chloride; target; including; spallation; products; prior; irradiation; sufficient; water; hydrochloric; acid; hydroxide; form; solution; filtering; adjusting; ph; admixing; molybdate-reagent; adjust; silicon-molybdate; complex; dextran-based; material; washing; remove; residual; contaminants; sodium-22; separating; adding; hydrogen; peroxide; prevent; reformation; yield; oxidization; molybdate; adapted; subsequent; separation; anion; exchange; whereby; retained; silicon; remains; optionally; alkali; metal; 12; 13; additionally; product; purity; subsequent separation; optionally adding; adding sufficient; solution including; material whereby; remove residual; sufficient water; hydrogen peroxide; hydrochloric acid; change material; anion exchange; alkali metal; metal hydroxide; exchange material; potassium chloride; potassium hydroxide; dextran-based material; specific activity; spallation products; activity silicon-32; chloride target; including spallation; prior irradiation; irradiated potassium; /423/252/