LASL analytical chemistry program for fissionable materials safeguards
Conference
·
OSTI ID:5721468
Gas-solid reactions at elevated temperature, used previously to convert uranium in refractory forms to species readily soluble in acid, are being applied to thorium materials. A microgram-sensitive spectrophotometric method was developed for determining uranium and the LASL Automated Spectrophotometer has been modified to use it. The instrument now is functional for determining milligram amounts of plutonium, and milligram and microgram amounts of uranium. Construction of an automated controlled-potential-coulometric analyzer has been completed. It is giving design performance of 0.1% relative standard deviation for the determination of plutonium using a method developed especially for the instrument. A method has been developed for the microcomplexometric titration of uranium in its stable (VI) oxidation state. A color probe analyzer assembled for this titration also has been used for microcomplexometric titration of thorium. The present status of reference materials prepared for NBS and for the SALE program, as well as examples of working reference materials prepared for use with nondestructive analyzers, is given. The interlaboratory measured value of the /sup 239/Pu half-life is 24,119 y. Just completed measurement of the half life of /sup 241/Pu is 14.38 y. Measurement of the /sup 240/Pu half life is in progress.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5721468
- Report Number(s):
- LA-UR-79-3190; CONF-791117-7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
055001* -- Nuclear Fuels-- Safeguards
Inspection
& Accountability-- Technical Aspects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400100 -- Analytical & Separations Chemistry
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL ANALYSIS
COMPLEXOMETRY
DISSOLUTION
ELEMENTS
EVEN-ODD NUCLEI
FISSIONABLE MATERIALS
HALF-LIFE
HEAVY NUCLEI
ISOTOPES
METALS
NUCLEI
PLUTONIUM
PLUTONIUM 239
PLUTONIUM 241
PLUTONIUM ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
RADIOISOTOPES
RESEARCH PROGRAMS
SAFEGUARDS
SPECTROPHOTOMETRY
THORIUM
TRANSURANIUM ELEMENTS
URANIUM
VOLTAMETRY
YEARS LIVING RADIOISOTOPES
Inspection
& Accountability-- Technical Aspects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400100 -- Analytical & Separations Chemistry
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL ANALYSIS
COMPLEXOMETRY
DISSOLUTION
ELEMENTS
EVEN-ODD NUCLEI
FISSIONABLE MATERIALS
HALF-LIFE
HEAVY NUCLEI
ISOTOPES
METALS
NUCLEI
PLUTONIUM
PLUTONIUM 239
PLUTONIUM 241
PLUTONIUM ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
RADIOISOTOPES
RESEARCH PROGRAMS
SAFEGUARDS
SPECTROPHOTOMETRY
THORIUM
TRANSURANIUM ELEMENTS
URANIUM
VOLTAMETRY
YEARS LIVING RADIOISOTOPES