Comparison
Comparison close
Results

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

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

Co-57
Di / MBq
Participating institutes

Results given in absolute values.

 

 

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

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

Co-57
Di / (kBq/MBq)
Participating institutes

Results given in relative values.

 

 

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

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 0.4 1.1
NMIJ -0.5 1.1
LNE-LNHB -0.42 0.93
NIST -0.1 1.2
POLATOM 1.2 1.5
NMISA 1.65 0.96
CMI -0.4 1.7
BARC 3.6 1.3
IFIN-HH 0.2 2.6
LNMRI/IRD 3.5 1.3
Participating institutes
BIPM.RI(II)-K1.Co-57
CCRI(II)-S6.Co-57

Results given in absolute values.

 

 

 

 

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

Degrees of equivalence represented by Di = (xI - xR) / xand 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 2.5 6.8
NMIJ -3.0 6.5
LNE-LNHB -2.5 5.5
NIST -0.4 7.3
POLATOM 7.0 8.6
NMISA 9.8 5.7
CMI -2 10
BARC 21.1 7.7
IFIN-HH 1 16
LNMRI/IRD 20.8 7.7
Participating institutes
BIPM.RI(II)-K1.Co-57
CCRI(II)-S6.Co-57

Results given in relative values.

 

 

 

Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(II)-K1.Co-57
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide Co-57
Time of measurements 1978 -
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 10 February 2003
Most recent results published on 18 August 2022
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

ANSTO

Australian Nuclear Science and Technology Organisation, Australia, APMP

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

Abandonned

CMI

Czech Metrology Institute, Czechia, EURAMET

IAEA

International Atomic Energy Agency, IAEA - International Organization, EURAMET

IFIN-HH

"Horia Hulubei" National Institute of Research and Development for Physics and Nuclear Engineering, Romania, EURAMET

IRA

Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE-LNHB

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

LNMRI

Laboratorio Nacional de Metrologia das Radiaçoes Ionizantes, IRD, Brazil, SIM

NIRH

National Institute of Radiation Hygiene, Denmark, EURAMET

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

NPL

National Physical Laboratory, United Kingdom, EURAMET

OMH

Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET

P3KRBiN

Pusat Penelitian & Pengembangan Keselamatan Radiasi & Biomedika Nuklir, Indonesia, APMP

POLATOM

Radioisotope Centre Polatom, Poland, EURAMET

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

The key comparison reference value xR for this radionuclide is estimated to be

 

xR = 168.99 MBq with a standard uncertainty uR = 0.25 MBq

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence are both expressed in MBq, where xi is the equivalent activity for laboratory i.

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

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57

MEASURAND   SIR equivalent activity of Co-57

 

xi  measurement value submitted by laboratory iLabi

ui   combined standard uncertainty of xi

 

BIPM.RI(II)-K1.Co-57

         
  Labi xi u(xi) Date of measurement
  MBq MBq
  PTB 169.42 0.56 2005-03-31
  NMIJ 168.48 0.53 2006-09-19
  LNE-LNHB 168.57 0.43 2007-06-20
  NIST 168.92 0.61 2010-05-21
  POLATOM 170.18 0.73 2013-11-19
  NMISA 170.64 0.45 2015-09-15
  CMI 168.62 0.85 2021-12-10
         

 

CCRI(II)-S6.Co-57

         
  Labi xi u(xi) Date of measurement
  MBq MBq
  BARC 172.55 0.60 2008
  IFIN-HH 169.2 1.3 2008
  LNMRI/IRD 172.50 0.60 2008