Comparison
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Results

MEASURAND : SIR equivalent activity of 57Co

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq

The right-hand axis shows approximate relative values only.

Comparison
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Results

MEASURAND : SIR equivalent activity of 57Co

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq

Results are presented under A4 printable format in Summary Results (PDF file).

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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
Last update: 28 February 2012

SIR equivalent activity of the radionuclide 57Co:

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-IIR

Czech Metrology Institute - Inspectorate for Ionizing Radiation, Czechia, EURAMET

Report in progress, Draft B

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
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Results

MEASURAND : SIR equivalent activity of 57Co

Key comparison reference value:
The SIR reference value for this radionuclide is xR = 168.8 MBq, with a standard uncertainty uR = 0.3 MBq.
xR is the mean of fifteen results, see section 4.1 of the Final Report dated February 2012.

The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in MBq. With n the number of laboratories, when each laboratory has contributed to the computation of xR, see Metrologia, 42, 140-144.

When required, the degree of equivalence between two laboratories can be evaluated by a pair of terms:
Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in MBq. The approximation Uij ~ 2(ui2 + uj2)1/2 may be used.
Comparison
Comparison close
Results

MEASURAND : SIR equivalent activity of 57Co

xi : result of measurement carried out in the SIR for the sample submitted by laboratory i
ui
: combined standard uncertainty of xi

 Lab i xi
/ kBq
ui
/ kBq
Date of measurement
 LNMRI 169400 1000 91-02-28
 CMI-IIR 170000 500 91-08-20
 VNIIM 167300 600 92-07-10
 MKEH 169300 500 96-07-12
 BEV 168800 1800 98-06-24
 KRISS 169710 390 99-01-05
 IRA 168000 600 00-12-04
 PTB 169400 600 05-03-31
 NMIJ 168500 500 06-09-19
 LNE-LNHB 168600 400 07-06-20
 IFIN-HH 171200

2200

08-07-21
 NIST

168900

600

10-05-21