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Traceability in gamma-ray spectrometry.

D Glavic-Cindro¹, M Korun

¹Jozef Stefan Institute, Ljubljana, Slovenia.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|December 1, 2009

Summary

The International vocabulary of metrology (VIM) redefines metrological traceability using a "chain of calibrations" instead of "comparisons." This update allows for broader traceability, including software and less influential quantities, impacting methods like gamma-ray spectrometry.

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Area of Science:

Metrology
Measurement Science
Analytical Chemistry

Background:

The International vocabulary of metrology-basic and general concepts and associated terms (VIM) is a foundational document in metrology.
Previous editions defined metrological traceability through an "unbroken chain of comparisons."

Purpose of the Study:

To explain the revised definition of metrological traceability in the latest VIM edition.
To explore the implications of this revised definition on measurement practices, particularly in gamma-ray spectrometry.

Main Methods:

Analysis of the VIM's updated definition of metrological traceability.
Comparison of the new "chain of calibrations" concept with the previous "chain of comparisons."
Examination of the impact of allowing interpolation in calibrations and the non-mandatory traceability of minor influence quantities.

Main Results:

Metrological traceability is now defined by a "chain of calibrations," replacing the "unbroken chain of comparisons."
Calibrations enable interpolation of quantity values and can be applied to software using software-measurement standards.
Traceability for quantities with minor influence on the result is no longer mandatory.
These changes facilitate the traceability of gamma-ray spectrometric results, even when not using a relative method.

Conclusions:

The revised VIM definition of metrological traceability offers greater flexibility and broader applicability.
The updated definition supports the traceability of advanced measurement techniques, including non-relative gamma-ray spectrometry.
This evolution in metrology enhances the reliability and comparability of measurement results across various scientific disciplines.