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The Système International de Référence and its application in key comparisons

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Guy Ratel

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The paper begins with the reasons which led to the installation of the Système International de Référence (SIR) more than 30 years ago, describes its main features and presents briefly the way it works. Then more detail is given on the treatment of impurities and on the determination of the efficiency curve. The improvements, which have been made recently to update the SIR and make it more efficient, are also discussed. A brief survey of the status of the present SIR is then given before focusing on the new developments which are in progress to enlarge the scope of the SIR towards measurements of radiopharmaceuticals with short half-lives and of α- and β-particle emitters.


PACS

29.40.Cs Gas-filled counters: ionization chambers, proportional, and avalanche counters

23.40.-s Beta decay; double beta decay; electron and muon capture

29.25.Rm Sources of radioactive nuclei

23.60.+e Alpha decay

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Dates

Issue 4 (August 2007)

Received 30 May 2007

Published 2 August 2007



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