Guy Ratel 2007 Metrologia 44 S7 doi:10.1088/0026-1394/44/4/S02
Guy Ratel
Show affiliationsThe 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.
29.40.Cs Gas-filled counters: ionization chambers, proportional, and avalanche counters
23.40.-s Beta decay; double beta decay; electron and muon capture
Accelerators, beams and electromagnetism
Issue 4 (August 2007)
Received 30 May 2007
Published 2 August 2007
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