Triple-Point Temperatures of 20Ne and 22Ne

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Journal titleInternational Journal of Thermophysics
Pages173188; # of pages: 16
SubjectIsotope; 20Ne; 22Ne; Neon; Triple point
AbstractInterest in the triple points of neon isotopes has recently arisen as a result of the multi-institute project to understand how variations in the isotopic composition of natural neon influence the triple-point temperature of a particular sample. Given the challenges in determining with sufficiently low uncertainty both the relative isotopic concentrations, particularly of 22Ne relative to 20Ne, and the temperature differences among cells filled from different gas sources in order to determine the sensitivity coefficient with adequate confidence, modeling of the isotopic influence becomes an attractive alternative for correcting the triple points of “natural” neon samples to a common composition. The modeling requires, among other things, knowledge of the triple-point temperatures of 20Ne and 22Ne. The triple points of these pure neon isotopes have utility in their own right as secondary reference temperatures on the ITS-90, and one or both of these could replace “natural” neon in a revised International Temperature Scale or approximation to the ITS. The neon isotope triple-point temperatures (on the IPTS-68) reported by Furukawa, Kemp, and Sakurai in various publications from 1972 to 1986 predate the ITS-90, and so there is utility in contemporarymeasurements (on the ITS-90) with gas samples of recent production. At NRC, we find the triple point of 20Ne to be at 24.54230K (13.80mK below the triple point of “natural” neon) and that of 22Ne to be at 24.68889K (132.79mK above the triple point of “natural” neon), assuming the reference sample of “natural” neon realizes the ideal ITS-90 temperature of 24.5561 K.
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AffiliationNational Research Council Canada; NRC Institute for National Measurement Standards
Peer reviewedYes
NPARC number17317244
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Record identifiereb675e0f-7087-45a9-ad1a-822c74e08f76
Record created2011-04-03
Record modified2016-05-09
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