DISSEMINATION OF THE NEW KILOGRAM VIA SILICON SPHERES

Frank Härtig, Horst Bettin, Michael Borys, Rudolf Meeß, Roman Schwartz

Abstract

The Physikalisch-Technische Bundesanstalt (PTB) is currently elaborating a concept for the maintenance and dissemination of the SI unit kilogram on the basis of silicon spheres. For this purpose, handling procedures and work instructions are elaborated. These contain, for example, the cleaning procedures of the spheres, the safe transport and storage as well as procedures for the monitoring of the growth of oxide on the sphere surface. Realisation of the redefined kilogram by means of ²⁸Si spheres and ^natSi_qp spheres as primary respectively "quasi primary" mass measurement standards and disseminated with industrially manufactured ^natSi_sc spheres as secondary mass measurement standards. The described procedures are to be developed in cooperation with European National Metrology Institutes (NMIs) and Destignated Institutes (DIs).

Keywords

kilogram, Avogadro constant, silicon mass measurement standard

Download

IMEKO-WC-2015-PL-002.pdf

DOI

-

Back to the proceedings