The Eastern Environmental Radiation Facility's participation in interlaboratory and intralaboratory comparisons of environmental sample analyses, 1981--1986

Technical Report · Tue Aug 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5590262· OSTI ID:5590262

Moore, J.; Broadway, J.; Blanchard, R.

This report compiles the results of the interlaboratory of the interlaboratory and intralaboratory quality assurance programs for the EERF's analytical chemistry laboratory during 1981 through 1986. The interlaboratory program, which consisted of participating in cross-check analyses with the EPA's EMSL-LV laboratory, the World Health Organization, and the Mound Facility, resulted in 544 analyses. The intralaboratory program consisted of 486 blind sample analyses and 2523 replicate sample analyses. Cross-check and blind sample analyses were considered acceptable when the result of the analysis was within 20 percent of the known concentration. Some results that differed by more than 20 percent were judged to be acceptable because of low sample concentrations, the uncertainty in the measurement and known value, and the small absolute difference. The distribution of the analytical precision, determined by performing 2523 replicate analyses (every tenth sample), was similar to but somewhat less, about 7 percent, than the expected theoretical distribution. 10 refs., 7 figs., 14 tabs.

• Research Organization: Environmental Protection Agency, Montgomery, AL (USA). Eastern Environmental Radiation Facility
• Sponsoring Organization: EPA
• OSTI ID: 5590262
• Report Number(s): EPA-520/5-89-008; ON: TI90001304
• Country of Publication: United States
• Language: English

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