Production of high specific activity silicon-32
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.
- Inventors:
-
- Los Alamos, NM
- Santa Barbara, CA
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- OSTI Identifier:
- 869489
- Patent Number(s):
- 5346678
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
G - PHYSICS G21 - NUCLEAR PHYSICS G21G - CONVERSION OF CHEMICAL ELEMENTS
- DOE Contract Number:
- W-7405-ENG-36
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- production; specific; activity; silicon-32; process; preparation; provide; 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; provided; 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; /423/376/
Citation Formats
Phillips, Dennis R, and Brzezinski, Mark A. Production of high specific activity silicon-32. United States: N. p., 1994.
Web.
Phillips, Dennis R, & Brzezinski, Mark A. Production of high specific activity silicon-32. United States.
Phillips, Dennis R, and Brzezinski, Mark A. Sat .
"Production of high specific activity silicon-32". United States. https://www.osti.gov/servlets/purl/869489.
@article{osti_869489,
title = {Production of high specific activity silicon-32},
author = {Phillips, Dennis R and Brzezinski, Mark A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}
Works referenced in this record:
A 32 Si Source from Proton Spallation of Vanadium
journal, February 1985
- Polak, P.; Garcia, S. R.; Taylor, W. A.
- ract, Vol. 38, Issue 2
Cycling of biogenic silica within the upper water column of the Ross Sea
journal, November 1991
- Nelson, David M.; Ahern, Julie A.; Herlihy, Linda J.
- Marine Chemistry, Vol. 35, Issue 1-4
A solvent extraction method for the colorimetric determination of nanomolar concentrations of silicic acid in seawater
journal, May 1986
- Brzezinski, Mark A.; Nelson, David M.
- Marine Chemistry, Vol. 19, Issue 2