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Si mole fraction in the new Avogadro silicon material by neutron

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Alan G. Steele is Canada's Chief Metrologist and Director General of the National Research Council's Metrology
Research Centre. He is responsible for research and measurement science activities in both physical and chemical
metrology. He joined NRC in 1991, following a Natural
Sciences and Engineering Research Council of Canada postdoctoral fellowship at King's College, London, UK. Dr.
Steele was elected as Fellow of the Royal Society of Canada
in 2017, recognizing his contributions to metrology, including work within the Sistema Interamericano de Metrologia;
in the Joint Committee of the Regional Metrology Organizations; as NRC representative to the Board of the National
Conference of Standards Laboratories International; and as
Canada's delegate to the General Conference on Weights
and Measures. He was elected to the International Committee for Weights and Measures (CIPM), the body which
oversees the operation of the Metre Convention, in November 2018.

[21]	R. Meeß, A. Felgner, G. Hinzmann, and A. Lück, "Surface
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of 99.999% enriched 28Si single crystals for the determination of
Avogadro's constant," Metrologia, vol. 54, pp. 599-609, 2017.

September 2020	

Barry M. Wood is Researcher Emeritus at the National Research Council in Ottawa, Canada. He is a former Chairman
of the CODATA Task Group on Fundamental Constants, a
Life Fellow of the IEEE and a Fellow of the National Research
Council of Canada.

IEEE Instrumentation & Measurement Magazine	9
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Instrumentation & Measurement Magazine 23-6

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