Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51

MEASURAND : SIR equivalent activity of 51Cr

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

Red diamonds and black squares: participants in BIPM.RI(II)-K1.Cr-51
Green triangle: participant in APMP.RI(II)-K2.Cr-51 (2004)
The black colour identifies participant's results prior to 1983

Note: the right-hand axis shows approximate relative values only

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51

MEASURAND : SIR equivalent activity of 51Cr

   
Lab iDiUi
 / MBq/ MBq
IRMM-4.12.5
CMI-IIR0.72.7
MKEH-0.72.6
PTB-0.42.0
NIST1.43.0
NMIJ-0.93.1
NPL-1.06.2
LNE-LNHB1.22.3
VNIIM0.32.6

In green: participant in APMP.RI(II)-K2.Cr-51

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

BIPM.RI(II)-K1.Cr-51
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide Cr-51
Time of measurements 1977 -
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
APMP.RI(II)-K2.Cr-51 results are linked to those of BIPM.RI(II)-K1.Cr-51
First results published on 7 March 2003
Update and APMP data published on 10 October 2005
Update published on 07 February 2009

SIR equivalent activity of the radionuclide 51Cr:
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

CMI-IIR

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

IRMM

Institute for Reference Materials and Measurements, European Union, EURAMET

KRISS

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

Report in progress, Draft B

LNE-LNHB

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

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NPL

National Physical Laboratory, United Kingdom, EURAMET

OMH

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

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51

MEASURAND : SIR equivalent activity of 51Cr

  • Key comparison BIPM.RI(II)-K1.Cr-51

Key comparison reference value:
The SIR reference value for this radionuclide is xR = 488.0 MBq, with a standard uncertainty uR = 0.3 MBq, see section 4.1 of the Final Report dated January 2009.

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.

The degree of equivalence between two laboratories is given 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 is used for the computation of the pair-wise degrees of equivalence.
  • Linking APMP.RI(II)-K2.Cr-51 to BIPM.RI(II)-K1.Cr-51

The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.Cr-51 having been normalized to the value of NMIJ as the linking laboratory (see Final Report dated October 2005).

The degree of equivalence of laboratory i participant in APMP.RI(II)-K2.Cr-51 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.
The approximation Ui = 2(ui2 + uR2)1/2 is used in the Matrix of equivalence.

The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = Di - Dj and Uij, its expanded uncertainty (k = 2), both expressed in MBq, where the approximation Uij = 2(ui2 + uj2 - 2ful2)1/2 is used (l is the NMIJ and f the correlation coefficient).
These statements make it possible to extend the BIPM.RI(II)-K1.Cr-51 Matrix of equivalence to the participant in the APMP.RI(II)-K2.Cr-51 comparison.
Comparison
Comparison close
Results

BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51

MEASURAND : SIR equivalent activity of 51Cr

  • Key comparison BIPM.RI(II)-K1.Cr-51

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
/ MBq
ui
/ MBq
Date of measurement
 IRMM 483.9 1.1 1981-06-17
 CMI-IIR 488.7 1.4 1982-06-30
 MKEH 487.3 1.3 1989-10-09
 PTB 487.6 0.9 1998-04-24
 NIST 489.4 1.4 1999-05-03
 NMIJ 487.1 1.6 2004-03-15
 NPL 487.0 3.4 2004-05-28
 LNE-LNHB 489.2 1.1 2006-07-17
  • Key comparison APMP.RI(II)-K2.Cr-51

xi : result of measurement carried out at laboratory i, converted to the equivalent activity through the NMJ SIR measurement (see Final Report dated October 2005)
ui
: combined standard uncertainty of xi

 Lab i xi
/ MBq
ui
/ MBq
Date of measurement
 VNIIM 488.3 1.2 2004