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
-k1.i-123_g_feb06.gif)
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.
BIPM.RI(II)-K1.I-123 and EUROMET.RI(II)-K2.I-123
MEASURAND : Equivalent activity of 123I
| Lab i | Di | Ui |
| / MBq | / MBq | |
| IRMM | -0.1 | 1.3 |
| LNE-LNHB | -0.2 | 1.1 |
| IRA | -0.8 | 1.2 |
| PTB | 1.2 | 2.0 |
| NPL | 0.2 | 1.2 |
In blue: participant in EUROMET.RI(II)-K2.I-123 only.
Results are presented under A4 printable format in Summary Results (.PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide I-123 |
| Time of measurements | 2022 - |
| Status | Continuous, approved for equivalence |
| References | |
| Measurand | SIR-TI equivalent activity in kBq |
| Transfer device | SIR Transfer Instrument |
| 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 SIR-TI: SIR Transfer Instrument 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 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| 2023 |
report in progress draft A |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| 2022 |
Measurements complete |
| LNMRI/IRD |
Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD, Brazil, SIM |
| 2023 |
Planned |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
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. |
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 |
