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Results

MEASURAND : SIR equivalent activity of 141Ce

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

Black squares: participants' results prior to 1983

Comparison
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Results

MEASURAND : SIR equivalent activity of 141Ce

   
Lab iDiUi
 / MBq/ MBq
ANSTO0.191.57
CMI-IIR-1.813.16
PTB1.582.81
BNM-LNHB-0.071.28
NIST0.111.97

The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).

Comparison
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BIPM comparison
Linked comparison
BIPM.RI(II)-K1.Ce-141
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide Ce-141
Time of measurements 1979 -
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

Results published on 14 November 2002

SIR equivalent activity of the radionuclide 141Ce:

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

BNM-LNHB

Bureau National de Métrologie - Laboratoire National Henri Becquerel, France, EURAMET

CMI-IIR

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

NIST

National Institute of Standards and Technology, United States, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

Comparison
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Results

MEASURAND : SIR equivalent activity of 141Ce

Key comparison reference value:
The SIR reference value for this radionuclide is xR = 266.00 MBq, with a standard uncertainty uR = 0.54 MBq.
xR is computed from the mean of the participant results. 

The degree of equivalence of each laboratory 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. With n the number of laboratories, , see Appendix 2 of the Final Report.

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.
Comparison
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Results

MEASURAND : SIR equivalent activity of 141Ce

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
 ANSTO 266200 700 79-05-16
 CMI-IIR 264200 1900 79-07-06
 PTB 267589 1659 92-04-02
 BNM-LNHB 265941 382 92-07-08
 NIST 266115 1036 99-05-04