Production of high specific activity silicon-32

Details Production of high specific activity silicon-32 Production of high specific activity silicon-32

1992-09-25

1994-09-13

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423249, 423325, 423335, 423339, 376192, 376195, C01B 3300, C01B 33113, G21G 404

Patent

active

053466780

ABSTRACT:
A process for preparation of silicon-32 is provide 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.

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Polak et al., "A .sup.32 Si Source From Proton Spallation of Vanadium", Radiochimica Acta 38, 73-77 (1985).
Nelson et al., "Cycling of Biogenic Silica Within the Upper Water Column of the Ross Sea", Mar. Chem. 35 (1991) 461-476.
Brzezinski et al., "A Solvent Extraction Method For The Colormetric Determination of Nanomolar Concentrations of Silicic Acid in Seawater", Mar. Chem. 19: (1986) 139-151.

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