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 4

Uncertainties for neon of the inter-comparisons CCT-K2 and CCT-K2.x with and without the contribution of the isotopic factor.

Comparisons	#	Cell fabricated (measured)	Sealing date	Cell	U_KC,original ^a		U_lab mean^b			U_CORR mean^c			Better byⁱ

					#1	#2	U_iso only^d	U (Type B)	U_TOTlab^e	U_NET without U_iso^f	U_iso,f^g	U_TRUE^h
					μK
K2, Star	1	BNM-INM	1985	BCMH2O	1080^j	2800^j	–	1100^j	1100^j	–	–	–
K2, Int84, Star	2	CNR-IMGC	1979	3Ne	280	280	110	130	210	170	22	171	39%
K2	3	KRISS	–	Open	400	400	300ⁿ	340	360	100	22	102	74%
K2	4	NIST	–	Open	320	320	150	180	265	170	22	171	46%
K2, Star, INRIM	5	NPL	1993	Ne2	440	380	300	190	200	80	6	80	79%
K2, K2.1	6	NRC	1985	F15	440	440	320ⁿ	360	400	120	1	120	73%
K2, Star, INRIM	7	PTB	1995	Ne-7		400	320	340	360	80	72	108	73%
K2.1	8	VNIIFTRI	–	Open	670		400ⁿ	–	420	270
K2.3, Star	9	INRIM (VSL)	1999	12Ne	620	620	314	–	392	306	48	310	50%
K2.4, Star	10	INM	2002	Ne02/1	760	760	480	600	600	280	72	289	62%
K2.4	11	INRIM (INTiBS)	2000	E3Ne	640	640	320ⁿ	–	400	320	48	324	49%
K2.3, K2.4	12	NRC	2004	Cu-M-1	640	640	320	–	400	320	94	334	48%
K2.3, K2.4, Star	13	NRC	1985	F17	640	640	320	–	–	320	2	320	50%
K2.5, INRIM	14	NMIJ-AIST	2006	Ne-5	600	600	280^o	–	290	320	8	320	50%
K2.5, (K2.2), INRIM	15	INRIM	2002	Ec2Ne	680	680^p	8^q	–	110	–	16	–	–

s.d.^k													15%^m
Mean^l													60%^m

Original uncertainties of the ΔTs (ΔT_or in Table 2).

Original laboratory uncertainty budgets from [19]: mean of #1 and #2 sets.

Uncertainties (a) cleaned up from the isotopic uncertainties (“U_iso only” under (b)): mean on #1 and #2 sets.

Item for the isotopic effect of the estimated laboratory uncertainty.

Total laboratory uncertainty budget.

Uncertainty budget corrected for the isotopic effect contribution.

Uncertainty of the isotopic corrections taken from [15].

New total uncertainty budget taking also (f) into account.

ⁱ

Lowering of (h) with respect to (e).

Data not elaborated.

Standard deviation of the column data.

Mean of the column data.

Improvement of (h) on (e) in percent.

ⁿ

Also includes chemical impurities.

Uncorrected, used in the uncertainty budget.

For the direct comparison (INRIM − NRC) 300 μK.

Uncertainty of the corrected value.

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