129I interlaboratory comparison: phase I and phase II results

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An interlaboratory comparison exercise for 129I was organized and conducted. A total of nine laboratories participated in the exercise to either a full or limited extent. In Phase I of the comparison, a suite of 11 samples were measured. The suite of samples contained both synthetic `standard type` materials (i.e., AgI) and environmental materials. The isotopic 129I/127I ratios of the samples varied from 10`-8 to 10`-14. In this phase, each laboratory was responsible for its own chemical preparation of the environmental samples. The 129I AMS measurements obtained at different laboratories for prepared AgI were in good agreement. However, large discrepancies ... continued below

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28 p.; Other: FDE: PDF; PL:

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Roberts, M.I.; Caffee, M.W. & Proctor, I.D. July 1, 1997.

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Description

An interlaboratory comparison exercise for 129I was organized and conducted. A total of nine laboratories participated in the exercise to either a full or limited extent. In Phase I of the comparison, a suite of 11 samples were measured. The suite of samples contained both synthetic `standard type` materials (i.e., AgI) and environmental materials. The isotopic 129I/127I ratios of the samples varied from 10`-8 to 10`-14. In this phase, each laboratory was responsible for its own chemical preparation of the environmental samples. The 129I AMS measurements obtained at different laboratories for prepared AgI were in good agreement. However, large discrepancies were seen in 129I AMS measurements of environmental samples. Because of the large discrepancies seen in the Phase I intercomparison, a subsequent study was conducted. In Phase II of the comparison, AgI was prepared from two environmental samples (IAEA 375 soil and maples leaves) by three separate laboratories. Each laboratory used its own chemical preparation method with each of the methods being distinctly different. The resulting six samples (two sets of three) were then redistributed to the participating 129I AMS facilities and 129I/127I ratios measured. Results and discussion of both the Phase I and Phase II interlaboratory comparison are presented.

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28 p.; Other: FDE: PDF; PL:

Notes

INIS; OSTI as DE98050884

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  • Other Information: PBD: 1 Jul 1997

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  • Other: DE98050884
  • Report No.: UCRL-ID--128218
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/639138 | External Link
  • Office of Scientific & Technical Information Report Number: 639138
  • Archival Resource Key: ark:/67531/metadc690525

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 16, 2016, 1:30 p.m.

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Roberts, M.I.; Caffee, M.W. & Proctor, I.D. 129I interlaboratory comparison: phase I and phase II results, report, July 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc690525/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.