BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
Results given in absolute values.
BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
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 given in relative values.
BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
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 |
||
| PTB | 0.4 | 1.1 | ||
| NMIJ | -0.5 | 1.1 | ||
| LNE-LNHB | -0.42 | 0.93 | ||
| NIST | -0.1 | 1.2 | ||
| POLATOM | 1.2 | 1.5 | ||
| NMISA | 1.65 | 0.96 | ||
| CMI | -0.4 | 1.7 | ||
| BEV | 5.1 | 2.6 | ||
| BARC | 3.6 | 1.3 | ||
| IFIN-HH | 0.2 | 2.6 | ||
| LNMRI/IRD | 3.5 | 1.3 |
Results given in absolute values.
BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
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 |
||
| PTB | 2.4 | 6.5 | ||
| NMIJ | -3.0 | 6.5 | ||
| LNE-LNHB | -2.5 | 5.5 | ||
| NIST | -0.6 | 7.1 | ||
| POLATOM | 7.1 | 8.9 | ||
| NMISA | 9.8 | 5.7 | ||
| CMI | -2.4 | 10.1 | ||
| BEV | 30.2 | 15.4 | ||
| BARC | 21.3 | 7.7 | ||
| IFIN-HH | 1.2 | 15.4 | ||
| LNMRI/IRD | 20.7 | 7.7 |
Results given in relative values.
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Measurement of radioactivity content of same solution |
| Time of measurements | 2008 |
| Status | Approved |
| Final Reports of the comparisons | |
| References | |
| Measurand | Activity per unit mass (Radionuclide: Co-57) |
| Transfer device | Aliquots of stock solution distributed to participants through third-party supplier |
| Comparison type | Supplementary Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Comments | |
| Pilot institute |
IAEA
International Atomic Energy Agency IAEA - International Organization |
| Contact person | S. Palm |
| Pilot laboratory | |
|---|---|
| IAEA |
International Atomic Energy Agency, IAEA - International Organization, SIM |
| AUFM |
Ankara University Faculty of Medicine, Department of Nuclear Medicine, Türkiye, EURAMET |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| CENTIS |
Centro de Isótopos, Cuba, COOMET |
| CMI-IIR |
Czech Metrology Institute - Inspectorate for Ionizing Radiation, Czechia, EURAMET |
| IFIN-HH |
"Horia Hulubei" National Institute of Research and Development for Physics and Nuclear Engineering, Romania, EURAMET |
| LNMRI |
Laboratorio Nacional de Metrologia das Radiaçoes Ionizantes, IRD, Brazil, SIM |
| NIST |
National Institute of Standards and Technology, United States, SIM |
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BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
The key comparison reference value xR and its associated standard uncertainty uR are computed according to section 4.1 and 4.2.1 of the BIPM.RI(II)-K1.Co-57 (2023) Final report respectively.
xR = 168.99 MBq uR = 0.25 MBq
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence are both expressed in MBq, where xi is the equivalent activity for laboratory i.
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)-S6.Co-57 to BIPM.RI(II)-K1.Co-57
NIST provides the link between the key comparison CCRI(II)-S6.Co-57 and BIPM.RI(II)-K1.Co-57, having participated in both comparisons. The linking process is described in Section 4 (p. 15) and Table 5 (p. 20) of the CCRI(II)-S6.Co-57 Final report.
BIPM.RI(II)-K1.Co-57 and CCRI(II)-S6.Co-57
MEASURAND SIR equivalent activity of Co-57
xi measurement value submitted by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.Co-57
| Labi | xi | ui | Date of measurement | |
| MBq | MBq | |||
| PTB | 169.42 | 0.56 | 2005-03-31 | |
| NMIJ | 168.48 | 0.53 | 2006-09-19 | |
| LNE-LNHB | 168.57 | 0.43 | 2007-06-20 | |
| NIST | 168.92 | 0.61 | 2010-05-21 | |
| POLATOM | 170.18 | 0.73 | 2013-11-19 | |
| NMISA | 170.64 | 0.45 | 2015-09-15 | |
| CMI | 168.62 | 0.85 | 2021-12-10 | |
| BEV | 174.10 | 1.30 | 2023-08-04 |
CCRI(II)-S6.Co-57
| Labi | xi | ui | Date of measurement | |
| MBq | MBq | |||
| BARC | 172.55 | 0.60 | 2008 | |
| IFIN-HH | 169.2 | 1.30 | 2008 | |
| LNMRI/IRD | 172.50 | 0.60 | 2008 |
