The ITS-90 after definition of neon isotopic reference composition: extent of the isotopic effect tested on previous inter-comparison results | International Journal of Metrology and Quality Engineering (IJMQE)

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Table 3

Data for neon used in this study and isotopic correction for CCT-K2.x.

#	Comparisons	Cell#	Set#1, K2.x^a, Set#2 T_meas,bc/K		Corrections DT (μK)		Isotopic-corrected K2.x^b T_meas,ac/K		T_meas,ac– T_KCRVac/μK		Isotopic-corrected K2.x^c T_thermal,ac/K		(T_thermal,ac– 24.5561 K)/μK

			T_KCRVbc = 24.55632	T_KCRVbc = 24.55638	Isotopic^d	Chemical total^e	T_KCRVac = 24.55647	T_KCRVac = 24.55656			T_th,mean = 24.56610 K	T_th,mean = 24.56610 K
1	K2, Star	BCMH2O	24.55630	24.55450	326	150	24.55663	24.55482	155	–1737^g	24.55597	24.55417	–166	–2026 ^g
2	K2, Int84, Star	3Ne	24.55643	24.55649	310	47	24.55674	24.55680	269	237	24.55612	24.55618	–20	–20
3	K2	Open^f	24.55633	24.55623	–34	1058	24.55630	24.55619	–175	–367	24.55636	24.55626	224	64
4	K2	Open	24.55619	24.55642	22	–	24.55621	24.55644	–259	–121	24.55617	24.55639	28	198
5	K2, Star, INRIM	Ne2	24.55622	24.55619	279	–	24.55650	24.55646	28	–94	24.55594	24.55591	–199	–289
6	K2, K2.1	F15	24.55626	24.55626	308	–	24.55657	24.55656	97	5	24.55595	24.55595	–188	–248
7	K2, Star, INRIM	Ne-7	–	24.55664	196	17(1)^h	–	24.55683	–	273	–	24.55644	–	244
8	K2.1	Open	24.55660	24.55660	289	–	–	24.55688	–	326	–	24.55631	–	111
9	K2.3, Star	12Ne	24.55568	24.55567	123	24(1)^h	24.55580	24.55579	–673	–770	24.55555	24.55554	–588	–653
10	K2.4, Star	Ne02/1	24.55570	24.55569	–32	2(1)^h	24.55571	24.55571	–761	–853	24.55568	24.55568	–460	–520
11	K2.4	E3Ne	24.55608	24.55607	123	24(1)^h	24.55620	24.55619	–273	–365	24.55595	24.55595	–188	–248
12	K2.3, K2.4	Cu-M-1	24.55610	24.55609	–32	–	24.55609	24.55608	–382	–474	24.55610	24.55610	–39	–99
13	K2.3, K2.4, Star	F17	24.55621	24.55620	308	–	24.55652	24.55651	44	–48	24.55590	24.55589	–241	–301
14	K2.5, INRIM	Ne-5	24.55578	24.55578	4	6(5)^h	24.55578	24.55578	–207	–299	24.55578	24.55578	–364	–419
15	K2.5, (K2.2), INRIM	Ec2Ne	24.55563	24.55563	123	24(1)^h	24.55575	24.55575	–357	–449	24.55551	24.55551	–633	–688
17	Int84, Star, INRIM	1Ne	24.55643	24.55649	115	272	24.55655	24.55660	74	42	24.55628	24.55407	–218	175
18	Star	E1Ne			123	24(1)^h
19	Star	11Ne			230	150
20	Star	7Ne			230	150
21	INRIM	Ne-2			23	24(1)^h
22	INRIM	15Ne			123	24(1)^h
23	INRIM	E4Ne			123	24(1)^h
24	INRIM	Ec1Ne			123	24(1)^h
25	Int84, Star	MC-897			289	343(1)^h

Cell F15 is the reference cell for the CCT-K2.x.

Original, with KCRV_bc computed as indicated in the text.

Using KCRV_ac computed as indicated in the text (isotopic correction only).

Isotopic-corrected values.

From [31]. See uncertainties in column “U_iso,f” in Table 4. Mean for cells #2 to #8 is + 180 μK. On isotopic assays, see also [15].

In italics the assays for only N₂ impurity (not available for H₂ impurity). No uncertainty: no reliable measure available.

See (g) in Table 2.

Not elaborated, clearly being an outlier.

If the impurity is higher than 10 ppm, the uncertainty of the impurity is 5 ppm or 2.5% of the impurity itself, whichever is higher (k = 1); if the impurity is lower than 10 ppm, the uncertainty of the impurity is 50% of the impurity itself (k = 1).

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