Comparison
Comparison close
Results

BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68

 

MEASURAND : Equivalent activity of Ge-68

 

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

Ge-68
Di / MBq
Participating institutes

Results in absolute values

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.

Ge-68
Di / kBq/MBq
Participating institutes

Results in relative values

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68

 

MEASURAND : Equivalent activity of Ge-68

 

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
IRA 0.02 0.16
LNE-LNHB 0.08 0.15
TENMAK-NUKEN 0.19 0.48
NIM -0.11 0.12
ANSTO -0.05 0.18
BARC -0.12 0.10
CIEMAT -0.09 0.13
IFIN-HH -0.22 0.31
INER -0.10 0.12
KRISS 0.19 0.21
LNMRI-IRD 0.00 0.18
NMIJ 0.05 0.23
NPL 0.09 0.23
POLATOM 0.09 0.21
PTB 0.11 0.27
SMU 1.71 0.15
Participating institutes
BIPM.RI(II)-K1.Ge-68
CCRI(II)-K2.Ge-68

Results in absolute values

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
NIST 4 12
IRA 2 10
LNE-LNHB 5 9
TENMAK-NUKEN 12 31
NIM -7.0 7.7
ANSTO -3 12
BARC -7.5 6.6
CIEMAT -5.8 8.1
IFIN-HH -14 19
INER -6.1 7.3
KRISS 12 13
LNMRI-IRD 0 11
NMIJ 3 14
NPL 5 14
POLATOM 5 13
PTB 7 17
SMU 109 10
Participating institutes
BIPM.RI(II)-K1.Ge-68
CCRI(II)-K2.Ge-68

Results in relative values

Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(II)-K1.Ge-68
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide Ge-68
Time of measurements 2012 -
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 Most recent results published on 16 February 2024.
The status for not yet completed comparisons is indicated in "Participants".
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

IRA

Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET

LNE-LNHB

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

LNMRI/IRD

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

NIM

National Institute of Metrology, China, APMP


NIST

National Institute of Standards and Technology, United States, SIM

TAEK

Turkish Atomic Energy Authority, Türkiye, EURAMET

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68

 

MEASURAND : Equivalent activity of Ge-68

 

BIPM.RI(II)-K1.Ge-68

Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is  xR = 15773 kBq with a standard uncertainty uR = 30 kBq

(see Section 4.1 of the BIPM.RI(II)-K1.I-Ge-58 Final Report).  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 CCRI(II)-K2.Ge-68 to BIPM.RI(II)-K1.Ge-68

The value xi is the equivalent activity for laboratory i participant in CCRI(II)-K2.Ge-68 having been normalized using the value of the NMIJ as the linking laboratory.

The degree of equivalence of laboratory i participant in CCRI(II)-K2.Ge-68 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 as none of these Di contributed to the key comparison reference value.

 

These statements make it possible to extend the BIPM.RI(II)-K1.Ge-68 matrix of equivalence to all participants in the CRI(II)-K2.Ge-68 comparison.

Comparison
Comparison close
Results

BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68

 

MEASURAND : Equivalent activity of Ge-68

 

xi   measured mass fraction reported by laboratory iLabi

ui   combined standard uncertainty of xi

 

BIPM.RI(II)-K1.Ge-68

  Labi xi ui Date of measurement
    kBq kBq  
  NIST 15 829 98 2014-12-15
  IRA 15 797 86 2015-04-22
  LNE-LNHB 15 855 81 2015-05-28
  TENMAK-NÜKEN 15 960 240 2018-01-04
  NIM 15 663 37 2021-05-10

 

CCRI(II)-K2.Ge-68

  Labi xi ui Date of measurement
    kBq kBq
  ANSTO 15 725 86 2018
  BARC 15 655 42 2018
  CIEMAT 15 682 56 2018
  IFIN-HH 15 550 150 2018
  INER 15 677 49 2018
  KRISS 15 960 100 2018
  LNMRI-IRD 15 777 84 2018
  NMIJ 15 820 110 2018
  NPL 15 860 110 2018
  POLATOM 15 860 100 2018
  PTB 15 880 130 2018
  SMU 17 487 71 2018