BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
Results in absolute values.
BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
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.
Results in relative values.
BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
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 |
||
| JRC | 8 | 19 | ||
| NPL | 0.7 | 3.3 | ||
| IFIN-HH | -8.5 | 10 | ||
| CMI | 0.6 | 4.7 | ||
| LNE-LNHB | -0.2 | 3.9 | ||
| IRA | 0.1 | 4.3 | ||
| ANSTO | -3.0 | 3.6 | ||
| ENEA-INMRI | 5.3 | 7.9 | ||
| LNMRI/IRD | -1.0 | 7.2 | ||
| NIST | 0.6 | 4.4 | ||
| NMISA | 1.8 | 3.7 | ||
| POLATOM | -0.6 | 6.6 | ||
| PTB | -0.2 | 3.3 |
Results in absolute values.
BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
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 |
||
| JRC | 13 | 34 | ||
| NPL | 1.3 | 6.0 | ||
| IFIN-HH | -15 | 18 | ||
| CMI | 1.1 | 8.4 | ||
| LNE-LNHB | -0.3 | 7.0 | ||
| IRA | 0.2 | 7.7 | ||
| ANSTO | -5.3 | 6.4 | ||
| ENEA-INMRI | 10 | 14 | ||
| LNMRI/IRD | -2 | 13 | ||
| NIST | 1.1 | 7.9 | ||
| NMISA | 3.3 | 6.7 | ||
| POLATOM | -1 | 12 | ||
| PTB | -0.3 | 5.9 |
Results in relative values.
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Lu-177 |
| Time of measurements | 2000 - |
| 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 SIR equivalent activity of the radionuclide 177Lu Most recent results published on 27 October 2026 |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Romain Coulon |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| 2023 |
|
| IFIN-HH |
"Horia Hulubei" National Institute of Research and Development for Physics and Nuclear Engineering, Romania, EURAMET |
| 2013 |
| IRA |
Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET |
| 2022 |
|
| 2025 |
| JRC |
Joint Research Centre, European Union, EURAMET |
| 2009 |
Comparison carried out under the institute name "IRMM" |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2014 | |
| 2024 |
|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 2000 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 2009 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 2000 |
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BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is 558 MBq, with a standard uncertainty uR equal to 1.1 MBq
(see Section 4.1 of the BIPM.RI(II)-K1.Lu-177 2026 Final report). The value xi is taken as the equivalent activity for a laboratory i.
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, and
Ui = 2((1 - 2wi )ui2 + uR2 )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 Ui /xR , both expressed in kBq/MBq.
Linking CCRI(II)-K2.Lu-177 to BIPM.RI(II)-K1.Lu-177
The value xi is the equivalent activity for laboratory i participant in CCRI(II)-K2.Lu-177 having been normalized using the value of the NPL as the linking laboratory.
The degree of equivalence of laboratory i participant in CCRI(II)-K2.Lu-177 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.Lu-177 matrices of equivalence to all participants in the CCRI(II)-K2.Lu-177 comparison
BIPM.RI(II)-K1.Lu-177 and CCRI(II)-K2.Lu-177
MEASURAND Equivalent activity of 177Lu
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.Lu-177
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| NPL | 559.5 | 1.8 | 2009-04-28 | |
| JRC | 566.0 | 10.0 | 2009-04-30 | |
| IFIN-HH | 550.3 | 5.1 | 2013-07-11 | |
| CMI | 559.4 | 2.5 | 2023-09-12 | |
| LNE-LNHB | 558.6 | 2.1 | 2024-02-09 | |
| IRA | 558.9 | 2.3 | 2025-10-08 |
CCRI(II)-K2.Lu-177
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| ANSTO | 555.8 | 1.4 | 2009 | |
| ENEA-INMRI | 564.1 | 3.8 | 2009 | |
| LNMRI/IRD | 557.8 | 3.4 | 2009 | |
| NIST | 559.4 | 1.9 | 2009 | |
| NMISA | 560.6 | 1.5 | 2009 | |
| POLATOM | 558.2 | 3.1 | 2009 | |
| PTB | 558.6 | 1.2 | 2009 |
