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 1/2 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 2/2