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A Bayesian approach to an interlaboratory comparison.

George S Jackson1, Paul Muzikar1, Brent Goehring2

  • 1PRIME Laboratory, Purdue University, West Lafayette, IN 47907.

Chemometrics and Intelligent Laboratory Systems : an International Journal Sponsored by the Chemometrics Society
|June 12, 2018
PubMed
Summary
This summary is machine-generated.

This study assessed accelerator mass spectrometry (AMS) measurements of calcium-41 (⁴¹Ca) between two labs. Results show high consistency between labs, with negligible offset and slightly underestimated uncertainties.

Keywords:
Bayesianaccelerator mass spectrometryinterlaboratory comparison

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Area of Science:

  • Nuclear Physics
  • Analytical Chemistry
  • Environmental Science

Background:

  • Interlaboratory comparisons are crucial for validating measurement techniques.
  • Calcium-41 (⁴¹Ca) is an unstable isotope increasingly used as a tracer in various scientific studies.
  • Accelerator Mass Spectrometry (AMS) is a key technology for quantifying rare isotopes like ⁴¹Ca.

Purpose of the Study:

  • To evaluate the quality and consistency of ⁴¹Ca AMS measurements from two leading laboratories: Lawrence Livermore National Laboratory (LLNL) and Purdue Rare Isotope Measurement Laboratory (PRIME Lab).
  • To develop and apply a generalizable Bayesian framework for assessing interlaboratory data quality.

Main Methods:

  • A Bayesian statistical framework was employed to analyze data from 47 samples, with each laboratory measuring aliquots of every sample.
  • The framework allowed for the derivation of probability distributions for key data quality parameters.

Main Results:

  • The analysis revealed negligible consistent offsets between the measurements from LLNL and PRIME Lab, indicating high agreement.
  • The quoted measurement uncertainties from both laboratories appear to be slightly underestimated.

Conclusions:

  • The Bayesian framework successfully assessed the consistency and quality of ⁴¹Ca AMS measurements.
  • The findings support the reliability of AMS for ⁴¹Ca measurements and provide insights into uncertainty quantification for interlaboratory studies.