Journal
ACCREDITATION AND QUALITY ASSURANCE
Volume 8, Issue 7-8, Pages 359-366Publisher
SPRINGER-VERLAG
DOI: 10.1007/s00769-003-0631-y
Keywords
tritium; uncertainty assessment; enrichment; scintillation spectrometry
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The method most widely used nowadays to measure environmental tritium levels in water is electrolytic enrichment followed by liquid scintillation spectrometry. Although these techniques have been in use for many years, there is a gap in systematic analysis of the sources of uncertainty associated with this particular application. The paper presents a comprehensive assessment of the individual uncertainty components of the entire analytical process, starting from sample preparation to radioactivity measurement. Examples of the complete uncertainty budget for typical tritium levels in the analysed water samples are included. The relative importance of individual uncertainty components is given and possible ways of improving the overall quality of analyses are discussed.
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