Key comparisons BIPM.RI(II)-K1.Sn-113
MEASURAND :
NOMINAL VALUE :
xi:
ui:
Lab i
PTB
LNE-LNHB
CIEMAT
Equivalent activity
15 000 kBq
equivalent measured activity for laboratory i
combined standard uncertainty of xi
xi
MBq
59.09
57.11
58.41
ui
MBq
0.75
0.31
0.31
Date of
measurement
2010-03-31
2010-08-02
2011-12-07
The Key Comparison Reference Value is calculated using the power-moderated weighted mean: x R = 58.81 MBq with a standard
uncertainty u R = 0.31 MBq. The KCRV was based on the results from CMI, PTB (2010) and CIEMAT (coincidence results only).
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms:
D i = (x i - x R) and U i , its expanded uncertainty (k = 2), both expressed in MBq, and
U i = 2((1 - 2w i)u i 2 + u R2)1/2 where w i is the weight of laboratory i contributing to the calculation of x R.
The BIPM key comparison database, May 2016
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Key comparisons BIPM.RI(II)-K1.Sn-113
Equivalent activity
15 000 kBq
Di
Ui
/ MBq
0.28
-1.70
-0.40
1.25
0.87
0.87
70
2
35
0
0
-2
-35
-4
-70
-6
-105
PTB
PTB
LNE-LNHB
CIEMAT
4
CIEMAT
Lab i
Di / MBq
D i : Degree of Equivalence expressed in MBq
U i : expanded uncertainty (k = 2) expressed in MBq
[Di / xR)] / (kBq/MBq)
BIPM.RI(II)-K1.Sn-113
LNE-LNHB
MEASURAND :
NOMINAL VALUE :
N.B. The Right hand axis shows approximate values only
The BIPM key comparison database, May 2016
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