Title: Design of a distributed radioactivity standard – feasible or not? Final report on the project "realisation of the becquerel"
Authors: PAEPEN Jan
Publisher: Publications Office of the European Union
Publication Year: 2016
JRC N°: JRC104384
ISBN: 978-92-79-64142-8
ISSN: 1831-9424
Other Identifiers: EUR 28271 EN
OP LC-NA-28271-EN-N
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC104384
DOI: 10.2789/345047
Type: EUR - Scientific and Technical Research Reports
Abstract: The "realisation of the becquerel" project is addressing the issue of potential failure of the SIR (Système International de Référence), by developing a fully reproducible ionisation chamber, which could serve as the realisation of the SI unit for radioactivity, the becquerel. To achieve this, all dimensional and operational parameters that influence the response, together with their tolerances should be investigated and brought together in a detailed construction plan. From 1997 until 2013, scientists and engineers from various National Metrology Institutes and the IRMM have studied the parameters of influence and have investigated many technical and operational issues, which are summarised in this report. Not compromising the requirement of a reproducibility of 0.2 % at 30 keV photon energy, only the highly expensive and dual-use material beryllium can be used for the construction of one of the most critical components, which makes it unlikely that such an ionisation chamber will ever be built.
JRC Directorate:Nuclear Safety and Security

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