Identification and characterization of resistate minerals containing uranium and thorium

A set of natural matrix Standard Reference Materials were developed by the National Bureau of Standards for analytical methods evaluation. These materials were analyzed using a KF fusion procedure and an acid dissolution procedure. The latter method yielded radioactive concentrations that were 15–20...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2009-11, Vol.282 (2), p.335-341
Main Authors: Motabar, Payam, Inn, Kenneth G. W., Davis, Jeff, LaRosa, Jerome
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Dissolution
Hadrons
Heavy Ions
High frequencies
Inorganic Chemistry
Mathematical analysis
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Standard reference materials
Thorium
Uranium
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Summary:A set of natural matrix Standard Reference Materials were developed by the National Bureau of Standards for analytical methods evaluation. These materials were analyzed using a KF fusion procedure and an acid dissolution procedure. The latter method yielded radioactive concentrations that were 15–20% lower then that of the former. This was thought to be due to a fraction of the sample, “resistates,” that did not dissolve during the dissolution. In this study, HF dissolutions were conducted on NIST natural matrix SRMs, in which ~0.08% of total sample mass remained after dissolution. The acid resistant residual materials were concentrated, then dissolved using a LiBO 2 fusion procedure and were found to contain a considerable fraction of the uranium and thorium.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-009-0329-7