The status and quality of radiation measurements for air, Volume 1
Environmental Protection Agency, Office of Research and Development, Environmental Monitoring and Support Laboratory, 1977 - Business & Economics - 32 pages
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4OO 5 OO 500 600 CONCENTRATION 600 CONCENTRATION pCi/filter 90Sr Gross Alpha A. S. Goldin air filter intercomparison Alpha Gross Beta AQCS Report Stat-1 central tendency Column control chart cross-check samples eddrs eight studies ENVIRONMENTAL PROTECTION AGENCY EXPECTED LABORATORY PRECISION expected precision experimental sigma Figure 3 continued filters containing known grand average values Gross Alpha Gross Histogram of Laboratory JFMAMJJASOND JUNE known value l-H CONTROL LIMIT labora laboratories reported data laboratories reported results Laboratory Averages Reported LABORATORY INTERCOMPARISON STUDIES mean range Monitoring and Support normalized deviation Office of Research OO 600 CONCENTRATION OUTLIER FEBRUARY 1975 OUTLIER JULY 1973 participating laboratories precision and accuracy precision requirements Quality Assurance Branch Quality Control Radioassay Radionuclide Analysis Reported for Cesium-137 Reported for Gross Reported for Strontium-90 Research and Development RNG ANLY s(pCi/filter SEPTEMBER 1975 standard deviation Techniques for Quality thd rethe U.S. Department U.S. ENVIRONMENTAL PROTECTION versus the month warning levels
Page ii - US Environmental Protection Agency, and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Page 1 - ... the cross-check samples and return their data to the Quality Assurance Branch for statistical evaluation. Comparisons are made between laboratories and within an individual laboratory for accuracy and precision. A computer report and an updated performance chart are returned to each participant. This enables each laboratory to document the precision and accuracy of its radiation data, to identify instrumental and procedural problems, and to compare performance with other laboratories.
Page 1 - ... guides, and for enforcement activities. It is therefore imperative that the precision and accuracy of the data be assured in order that policy decisions concerning environmental quality be based on valid and comparable data. The quality assurance program of the US Environmental Protection Agency (EPA) is designed to encourage the development and implementation of quality control procedures at all levels of sample collection, analysis, data handling, and reporting. Quality control responsibilities,...