Method validation and verification in liquid scintillation counting using the long-term uncertainty method (LTUM) on two decades of proficiency test data

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Results from proficiency tests gathered over the past two decades by the laboratory for low level radioactivity measurements for liquid scintillation counting of 3H (184 results) and 14C (74 results) are used to verify the validated measurement methods used by the laboratory, in particular the estimated uncertainty budget of the method and its reproducibility and stability. A linear regression approach is used for the analysis of the results, described in the literature as the long term uncertainty in measurement method. The present study clearly indicates the advantages of using proficiency test results in identifying possible constant or proportional bias effects as well as the possibility to compare the laboratory performance with the performance of peer laboratories.


Original languageEnglish
Pages (from-to)737–742
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Issue number2
Publication statusPublished - 1 Nov 2017
Event2017 LSC - International conference on advances in Liquid Scintillation Spectrometry - Copenhagen, Denmark
Duration: 1 May 20175 May 2017


  • Liquid scintillation counting, Measurement uncertainty, Proficiency test, Tritium, Radio-carbon, Validation, Verification

ID: 5655886