Abstract
Filter radiometric measurements of high-temperature fixed points will provide a means of realizing and disseminating the thermodynamic temperature for temperatures above the silver point, with uncertainties that are competitive with the defined ITS-90. This paper presents the analysis method proposed for determining the thermodynamic temperature of the melting transitions of Re–C, Pt–C, and Co–C eutectic fixed points by combining filter radiometer measurements by nine laboratories to obtain a single temperature for each fixed point. It discusses the key sources of error, the corrections applied for known systematic effects, and the uncertainties. These sources of error introduce correlation between the measured values; the paper describes how data can be combined in a way that accounts for that correlation.
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