– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Extension of the SIR 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

International Reference System (SIR)
SIR efficiency curve
New mathematical solution to the efficiency curve
Extension of the SIR to beta-ray emitters
Participation in the SIR