Comparison
Comparison close
Results

BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123

MEASURAND : Equivalent activity of 123I

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

Left part of the graph : participants in BIPM.RI(II)-K1.I-123
Right part of the graph : participant in EUROMET.RI(II)-K2.I-123 (year 1983)
Black squares : participants' results prior to 1985

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

Comparison
Comparison close
Results

BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123

MEASURAND : Equivalent activity of 123I

   
Lab iDiUi
 / MBq/ MBq
IRMM-0.11.3
LNE-LNHB-0.21.1
IRA-0.81.2
PTB1.22.0
   
NPL0.21.2

In blue: participant in EUROMET.RI(II)-K2.I-123 only.

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

Comparison
Comparison close
RMO comparison
Linked comparison
EUROMET.RI(II)-K2.I-123
Metrology area, Sub-field Ionizing Radiation, Section II (Measurement of Radionuclides)
Description Activity of radionuclide I-123
Time of measurements 1983
Status Approved for equivalence
Final Reports of the comparisons
Measurand Activity
Comparison type Key Comparison
Consultative Committee CCRI (Consultative Committee for Ionizing Radiation)
Conducted by EURAMET (European Association of National Metrology Institutes)
Comments

EUROMET.RI(II)-K2.I-123 results are linked to those of BIPM.RI(II)-K1.I-123

BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123 results were published on 26 June 2003.

SIR equivalent activity of the radionuclide 123I

Pilot institute IGM
Inspection Générale de la Métrologie
Belgium
Contact person D.F.G. Reher

+32 (0) 14 571 263
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
IRE

Institut national des radioéléments, Belgium, EURAMET

IRMM

Institute for Reference Materials and Measurements, European Union, EURAMET

LNE-LNHB

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

NPL

National Physical Laboratory, United Kingdom, EURAMET

SCK-CEN

Studiecentrum voor Kernenergie - Centre d'étude de l'Energie Nucléaire, Belgium, EURAMET

Comparison
Comparison close
Results

BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123

MEASURAND : Equivalent activity of 123I

• Key comparison BIPM.RI(II)-K1.I-123

Key comparison reference value:
The SIR reference value for this radionuclide is xR = 120.25 MBq, with a standard uncertainty, uR = 0.41 MBq, see section 4.1 of the Final Report.

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, 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 EUROMET.RI(II)-K2.I-123 to BIPM.RI(II)-K1.I-123

The value xi is the equivalent activity for laboratory i participant in EUROMET.RI(II)-K2.I-123 having been normalized to the value of the LNE-LNHB and IRMM as linking laboratories (see Final Report).

The degree of equivalence of laboratory i participant in EUROMET.RI(II)-K2.I-123 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, one participant in BIPM.RI(II)-K1.I-123 and one in EUROMET.RI(II)-K2.I-123, or both participants in EUROMET.RI(II)-K2.I-123, is given by a pair of terms expressed in MBq:
Dij = Di - Dj and Uij, its expanded uncertainty (k = 2), approximated by
Uij = 2(ui2 + uj2 - 2ful2)1/2 with l being the linking laboratory when each laboratory is from the EUROMET and f is the correlation coefficient.


These statements make it possible to extend the BIPM.RI(II)-K1.I-123 Matrix of equivalence to all participants in EUROMET.RI(II)-K2.I-123.
Comparison
Comparison close
Results

BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123

MEASURAND : Equivalent activity of 123I

Key comparison BIPM.RI(II)-K1.I-123

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
 IRMM 120120 730 83-05-31
 LNE-LNHB 120020 470 83-05-31
 IRA 119450 570 85-06-27
 PTB 121400 1300 85-10-25

• Key comparison EUROMET.RI(II)-K2.I-123

xi : result of measurement carried out at laboratory i converted to the equivalent activity through the LNE-LNHB and the IRMM
ui : combined standard uncertainty of xi

 Lab i xi
/ kBq
ui
/ kBq
Measurement report date
 NPL 120480 440 1983