BIPM.RI(II)-K1.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
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.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
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.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
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 |
||
| NMIJ | 0.11 | 0.28 | ||
| VNIIM | -0.16 | 0.26 | ||
| IFIN-HH | 0.00 | 0.45 | ||
| NMISA | 0.10 | 0.19 | ||
| BEV | -0.21 | 0.39 | ||
| NRC | 0.29 | 0.33 | ||
| TENMAK-NUKEN | 0.07 | 0.85 | ||
| BelGIM | -0.39 | 0.55 | ||
| SMU | 0.16 | 0.63 |
Results given in absolute values.
BIPM.RI(II)-K1.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
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 |
||
| NMIJ | 4 | 10 | ||
| VNIIM | -5.8 | 9.4 | ||
| IFIN-HH | 0 | 16 | ||
| NMISA | 3.5 | 6.8 | ||
| BEV | -8 | 14 | ||
| NRC | 11 | 12 | ||
| TENMAK-NUKEN | 3 | 31 | ||
| BelGIM | -14 | 20 | ||
| SMU | 6 | 23 |
Results given in relative values.
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Cs-137 |
| Time of measurements | 1976 - |
| 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 Last update: 30 September 2024 COOMET.RI(II)-K2.Cs-137 results are linked to those of BIPM.RI(II)-K1.Cs-137 SIR equivalent activity of the radionuclide 137Cs |
| 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 |
| 1982 | |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| 1994 |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| 1997 |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| 1998 | |
| 2011 |
| CMI-IIR |
Czech Metrology Institute - Inspectorate for Ionizing Radiation, Czechia, EURAMET |
| 1980 |
| CNEA |
National Commission of Atomic Energy, Argentina, SIM |
| 1992 |
| CSIR-NML |
Council for Scientific and Industrial Research, National Metrology Laboratory (became NMISA in 2007), South Africa, AFRIMETS |
| 1980 | |
| 2010 |
| IFIN-HH |
"Horia Hulubei" National Institute of Research and Development for Physics and Nuclear Engineering, Romania, EURAMET |
| 2009 |
| IRA |
Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET |
| 1996 | |
| 2000 |
| IRMM |
Institute for Reference Materials and Measurements, European Union, EURAMET |
| 2004 |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 1998 |
| NIM |
National Institute of Metrology, China, APMP |
| 1999 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1983 | |
| 2001 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 1994 | |
| 2005 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 1977 |
| NRC |
National Research Council, Canada, SIM |
| 2014 |
| OMH |
Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET |
| 1997 |
| P3KRBiN |
Pusat Penelitian & Pengembangan Keselamatan Radiasi & Biomedika Nuklir, Indonesia, APMP |
| 1989 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 1997 |
| TENMAK-NUKEN |
Nuclear Energy Research Institute, Türkiye, EURAMET |
| 2018 |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| 2007 |
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BIPM.RI(II)-K1.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
BIPM.RI(II)-K1.Cs-137
Key comparison reference value: the SIR reference value xR for this radionuclide is 27 613 kBq, with a standard uncertainty uR equal to 47 kBq
(see Section 4.1 of the BIPM.RI(II)-K1.Cs-137 Final report dated 2024). 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 = (xi - xR) and Ui its 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 COOMET.RI(II)-K2.Cs-137 (2007) to BIPM.RI(II)-K1.Cs-137
The value xi is the equivalent activity for laboratory i participant in COOMET.RI(II)-K2.Cs-137 having been normalized to the value of the VNIIM as the linking laboratory (see section 4 of the Report dated 2013; Metrologia, 2013, 50, Tech. Suppl., 06014).
The degree of equivalence of laboratory i participant in COOMET.RI(II)-K2.Cs-137 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 following table for degrees of equivalence.
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.
BIPM.RI(II)-K1.Cs-137 and COOMET.RI(II)-K2.Cs-137
MEASURAND : Equivalent activity of 137Cs
BIPM.RI(II)-K1.Cs-137
xi result of measurement carried out in the SIR for the sample submitted by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| NMIJ | 27 720 | 140 | 2005-04-28 | |
| VNIIM | 27 450 | 120 | 2007-08-09 | |
| IFIN-HH | 27 610 | 220 | 2009-07-27 | |
| NMISA | 27 710 | 90 | 2010-08-05 | |
| BEV | 27 400 | 190 | 2011-09-27 | |
| NRC | 27 910 | 170 | 2014-03-13 | |
| TENMAK-NUKEN | 27 690 | 420 | 2018-01-11 |
COOMET.RI(II)-K2.Cs-137
xi result of measurement carried out by laboratory i converted to the equivalent activity through the VNIIM SIR measurements (see Report dated 2013; Metrologia, 2013, 50, Tech. Suppl., 06014)
ui combined standard uncertainty of xi
| Labi | xi | ui | Year of measurement | |
| kBq | kBq | |||
| BelGIM | 27 220 | 270 | 2007 | |
| SMU | 27 770 | 310 | 2007 |
