– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Extension to beta-ray emitters

The SIR has recently been extended to include pure beta-ray emitters, measured with a liquid-scintillation spectrometer using the CIEMAT/NIST method. The results of the comparison of activity measurements of several solutions of 90Sr are shown below.

The liquid scintillation counter

Special issues:

Uncertainties in Radionuclide Metrology

Radionuclide Metrology