Evaluation of an interlaboratory comparison involving pyrocarbon and silicon carbide-coated uranium--thorium carbide beads
An interlaboratory comparison program was conducted between six chemistry laboratories and three nondestructive assay laboratories. The material of interest was pyrocarbon- and silicon carbide - coated uranium-- thorium carbide beads. Accuracy of uranium and thorium measurements was ascertained by supplying to the laboratories uranium oxide and thorium oxide samples containing known quantities. With one exception. the accuracy of the chemical analysis of uranium was within a range of 0.5% relative to the prepared value. Within- laboratory precisions ranged from 0.013 to 0.39% RSD for the mixed oxide samples. Chemical assay of the beads exhibited a range of nearly plus or minus 1% (relative) about the interlaboratory chemical average for uranium content. Withinlaboratory precisions ranged from 0.03 to 0.38% RSD. Some dependence on sample preparation was evidenced. NDA measurements on mixed oxides showed biases as high as 3% from the prepared values. Measurements on coated beads were nearly comparable with chemical measurements in accuracy. (auth)
- Research Organization:
- USAEC New Brunswick Lab., N.J.
- NSA Number:
- NSA-29-004819
- OSTI ID:
- 4393452
- Report Number(s):
- NBL--269
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*THORIUM CARBIDES-- CHEMICAL ANALYSIS
*THORIUM-- CHEMICAL ANALYSIS
*URANIUM CARBIDES-- CHEMICAL ANALYSIS
*URANIUM-- CHEMICAL ANALYSIS
COMPARATIVE EVALUATIONS
N40120* --Chemistry--Analytical & Separations Chemistry-- Chemical & Spectral Procedures
NONDESTRUCTIVE ANALYSIS
STANDARDS STANDARDS