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Production of high specific activity silicon-32

Patent ·
OSTI ID:869489
 [1];  [2]
  1. Los Alamos, NM
  2. Santa Barbara, CA
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM
DOE Contract Number:
W-7405-ENG-36
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5346678
OSTI ID:
869489
Country of Publication:
United States
Language:
English

References (3)

A solvent extraction method for the colorimetric determination of nanomolar concentrations of silicic acid in seawater journal May 1986
A 32 Si Source from Proton Spallation of Vanadium journal February 1985
Cycling of biogenic silica within the upper water column of the Ross Sea journal November 1991

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Related Subjects

/423/376/
12
13
acid
activity
activity silicon-32
adapted
adding
adding sufficient
additionally
adjust
adjusting
admixing
alkali
alkali metal
anion
anion exchange
change material
chloride
chloride target
complex
contacting
contaminants
dextran-based
dextran-based material
exchange
exchange material
filtering
form
hydrochloric
hydrochloric acid
hydrogen
hydrogen peroxide
hydroxide
including
including spallation
irradiated
irradiated potassium
irradiation
material
material whereby
metal
metal hydroxide
molybdate
molybdate-reagent
optionally
optionally adding
oxidization
peroxide
ph
potassium
potassium chloride
potassium hydroxide
preparation
prevent
prior
prior irradiation
process
product
production
products
provide
provided
purity
reformation
remains
remove
remove residual
residual
retained
separating
separation
silicon
silicon-32
silicon-molybdate
sodium-22
solution
solution including
spallation
spallation products
specific
specific activity
subsequent
subsequent separation
sufficient
sufficient water
target
washing
water
whereby
yield