Activity measurements of the radionuclide 111In for the PTB, Germany in the ongoing comparison BIPM.RI(II)-K1.In-111

G Ratel, C Michotte, K Kossert, H Janßen
2006 Metrologia  
In 2005, the Physikalisch-Technische Bundesanstalt (PTB) submitted a sample of known activity of 111 In to the International Reference System (SIR). The value of the activity submitted was about 28 MBq. This key comparison result is the first result for Germany in the matrix of degrees of equivalence in the key comparison database that now contains six results, identifier BIPM.RI(II)-K1.In-111. Final Update Report for In-111 2006/01/23 2/10 Key comparison BIPM.RI(II)-K1.In-111 MEASURAND :
more » ... lent activity of 111 In Key comparison reference value: the SIR reference value x R for this radionuclide is 43.00 MBq, with a standard uncertainty of 0.12 MBq (see Section 4.1 of the Report), the value x i is taken as the equivalent activity for laboratory i. 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 -2/n )u i 2 + (1/n 2 )Σu i 2 ) 1/2 when each laboratory has contributed to the calculation of x R , with n the number of laboratories. The degree of equivalence between two laboratories is given by a pair of numbers:
doi:10.1088/0026-1394/43/1a/06002 fatcat:lmn7yjds2jemxmni3g3z5lr74q