Transcription of 19 MEASUREMENT UNCERTAINTY - US EPA
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19 MEASUREMENT UNCERTAINTY - US EPA
1 Planners and decisionmakers must also consider the variability of the analyte in sampled populations, as discussedin Appendix C; however, the focus of this chapter is on the UNCERTAINTY of measuring the analyte in each 2004 MARLAP19 MEASUREMENT OverviewThis chapter discusses the evaluation and reporting of MEASUREMENT UNCERTAINTY . Laboratorymeasurements always involve UNCERTAINTY , which must be considered when analytical results areused as part of a basis for making Every measured result reported by a laboratoryshould be accompanied by an explicit UNCERTAINTY estimate. One purpose of this chapter is to giveusers of radioanalytical data an understanding of the causes of MEASUREMENT UNCERTAINTY and ofthe meaning of UNCERTAINTY statements in laboratory reports. The chapter also describes proce-dures which laboratory personnel use to estimate chapter has more than one intended audience. Not all readers are expected to have themathematical skills necessary to read and completely understand the entire chapter.
Measurement Uncertainty MARLAP 19-2 JULY 2004 easy to evaluate (see Sections 19.3.5 and 19.5.2). However, the counting uncertainty is only one component of the total measurement uncertainty.
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