Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cu-64 and BIPM.RI(II)-K4.Cu-64

 

MEASURAND           Equivalent activity of Cu-64

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.

Cu-64
Di / MBq
Participating institutes

Results given in absolute values.

MEASURAND           Equivalent activity of Cu-64

 

Degrees of equivalence represented by Di = (xI - xR)/xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.

Cu-64
Di / (kBq/MBq)
Participating institutes

Results given in relative values.

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cu-64 and BIPM.RI(II)-K4.Cu-64

 

MEASURAND           Equivalent activity of Cu-64

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.

LABi Di Uneg,i Upos,i
MBq
MBq
MBq
PTB 0.41 0.80
CMI-IIR -1.2 1.4
NPL 0.0 1.0
LNE-LNHB 0.3 1.2
ENEA-INMRI -0.2 1.4
NIST -0.4 1.2
POLATOM 0.6 1.2
NRC 0.9 2.3
Participating institutes
BIPM.RI(II)-K1.Cu-64
BIPM.RI(II)-K4.Cu-64

Results given in absolute values.

MEASURAND           Equivalent activity of Cu-64

 

Degrees of equivalence represented by Di = (xI - xR)/xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.

LABi Di Uneg,i Upos,i
kBq/MBq
kBq/MBq
kBq/MBq
PTB 5 10
CMI-IIR -15 18
NPL 1 12
LNE-LNHB 3 14
ENEA-INMRI -2 17
NIST -6 15
POLATOM 7 14
NRC 11 28
Participating institutes
BIPM.RI(II)-K1.Cu-64
BIPM.RI(II)-K4.Cu-64

Results given in relative values.

Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(II)-K1.Cu-64
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide Cu-64
Time of measurements 2009 -
Status Continuous, approved for equivalence
Final Reports of the comparisons
Measurand SIR equivalent activity
Transfer device Radioactive solution
Comparison type Key Comparison
Consultative Committee CCRI (Consultative Committee for Ionizing Radiation)
Conducted by BIPM (Bureau International des Poids et Mesures)
Comments SIR: Système International de Référence, International Reference System
First results published on 06 June 2009
Last update: 22 November 2017

BIPM.RI(II)-K4.Cu-64 results are linked to those of BIPM.RI(II)-K1.Cu-64.
SIR equivalent activity of the radionuclide 64Cu:
Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person Carine Michotte

+33 (0) 1 45 07 70 85
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

CMI

Czech Metrology Institute, Czechia, EURAMET

ENEA-INMRI

Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET

LNE-LNHB

Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET

NPL

National Physical Laboratory, United Kingdom, EURAMET

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cu-64 and BIPM.RI(II)-K4.Cu-64

 

MEASURAND           Equivalent activity of Cu-64

 

Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is  xR = 80.99 MBq with a standard uncertainty uR = 0.34 MBq

5see the most recent KCRV updateSection 4 of Metrologia 2013 50 Tech. Suppl. 06021). The value xi is taken as the equivalent activity for a laboratory i.

 

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms:

Di = (x- xR) and Uits expanded uncertainty (k = 2), both expressed in MBq, and

Ui = 2((1 - 2wi)ui2 + u2R)1/2, where wi is the weight of laboratory i contributing to the calculation of xR.

The degrees of equivalence are also given in relative terms by Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.

 

Linking BIPM.RI(II)-K4.Cu-64 to BIPM.RI(II)-K1.Cu-64

The value xi is the SIRTI equivalent activity for laboratory i participant in BIPM.RI(II)-K4.Cu-64 multiplied by the linking factor to BIPM.RI(II)-K1.Cu-64.

The degree of equivalence of laboratory i participant in BIPM.RI(II)-K4.F-18 with respect to the reference value is given by a pair of terms:
Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in MBq. The approximation Ui = 2(ui2 + uR2)1/2 is used in the following table.

These statements make it possible to extend the BIPM.RI(II)-K1.F-18 matrices of equivalence to all participants in the BIPM.RI(II)-K4.Cu-64 comparisons

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cu-64 and BIPM.RI(II)-K4.Cu-64

 

MEASURAND           Equivalent activity of Cu-64

 

xi   result of measurement carried out in the SIR for the sample submitted by laboratory i, Labi

ui   combined standard uncertainty of xi

 

BIPM.RI(II)-K1.Cu-64

 

  Labi xi ui Date of measurement
    MBq MBq  
  PTB 81.40 0.39 2009-02-12
  CMI-IIR 79.75 0.79 2009-09-16
  NPL 81.03 0.51 2009-11-18
  LNE-LNHB 81.27 0.63 2010-03-18
  ENEA-INMRI 80.82 0.61 2011-10-14

 

 

BIPM.RI(II)-K4.Cu-64

 

  Labi xi ui Date of measurement
  MBq MBq  
  NIST 80.54 0.50 May 2016
  POLATOM 81.58 0.48 Oct. 2016
  NRC 81.9 1.1 Jun. 2017