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The KCWG(II) has posted the Measurement Methods Matrix (MMM), as a tool for evaluating CMCs in radioactivity, on the BIPM website.

In the interest of supporting the calibration and measurement capabilities (CMCs) published by National Measurement and Designated Institutes (NMIs and DIs) on the Key Comparison Database (KCDB), the Consultative Committee on Ionizing Radiation Section II [CCRI(II)] developed a generic groupings table of radionuclides called the MMM. Using these groupings, CCRI(II) and corresponding technical committees in the Regional Metrology Organizations (RMOs) might leverage a select set of comparisons to support a wider range of CMCs for the measurement of radionuclides. The MMM has been designed for used by the NMIs and DIs.

For the official rules to CMC claims, refer to the latest “Rules for entering CMC Claims in Ionizing Radiation Metrology” located on the BIPM website: https://www.bipm.org/en/committees/cc/ccri/publications.

The MMM is meant to be used as a tool for evaluating CMCs but should not be construed to imply traceability of radionuclides, which still requires an unbroken chain of comparisons or calibrations against an appropriate standard.