BIPM.RI(I)-K5, APMP.RI(I)-K5 and EURAMET.RI(I)-K5.1
MEASURAND Air kerma
Radiation quality Cs-137 beam
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2) expressed in mGy/Gy
BIPM.RI(I)-K5, APMP.RI(I)-K5 and EURAMET.RI(I)-K5.1
MEASURAND Air kerma
Radiation quality Cs-137 beam
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2) expressed in mGy/Gy
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| NIST | -1.0 | 7.0 | ||
| NMIJ | -2.3 | 5.2 | ||
| PTB | 2.4 | 5.4 | ||
| NIM | -3.3 | 4.2 | ||
| ININ | 4.8 | 4.0 | ||
| VSL | -4.8 | 7.6 | ||
| SMU | 5.1 | 5.4 | ||
| BEV | 4.3 | 5.4 | ||
| CIEMAT | -0.8 | 4.4 | ||
| GUM | 0.5 | 5.6 | ||
| LNE-LNHB | -3.0 | 4.4 | ||
| KRISS | -0.8 | 4.0 | ||
| NRSL/INER | -4.6 | 8.9 | ||
| VINS | -3.3 | 20.2 |
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of air kerma for Caesium 137 |
| Time of measurements | 1994 - |
| Status | Continuous, approved for equivalence |
| Final Reports of the comparisons | |
| References |
Technical Protocol for ongoing BIPM Dosimetry comparisons International framework of traceability for radiation dosimetry quantities |
| Measurand | Air kerma |
| Parameters | Radiation type: Cs-137 gamma rays |
| Transfer device | Ionization chambers |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | BIPM (Bureau International des Poids et Mesures) |
| Comments | The Final Report for each bi-lateral comparison is listed in the tab "Participants" Most recent update of results made on 15 October 2025 Results older than 15 years are no longer considered valid |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | C. Kessler +33 (0) 1 45 07 70 84 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| 1995 | |
| 2009 | |
| 2023 |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| 1994 |
|
| 2009 |
|
| CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
| 2023 |
| ENEA-INMRI |
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET |
| 1998 |
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| 2006 | |
| 2024 |
| ININ |
Instituto Nacional de Investigaciones Nucleares, Mexico, SIM |
| 2015 |
| ITN |
Instituto Tecnólogico e Nuclear, now IST-LPSR, Instituto Tecnológico e Nuclear, Laboratório de Proteção e Segurança Radiológica, Campus Tecnológico e Nuclear, Portugal, EURAMET |
| 2008 |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| 2010 | |
| 2025 |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 1995 | |
| 2008 | |
| 2024 |
| NIM |
National Institute of Metrology, China, APMP |
| 2014 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1994 | |
| 2011 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 2001 | |
| 2012 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 2000 | |
| 2014 |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| 2017 |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| 1997 | |
| 2009 |
| VSL |
VSL, Netherlands, EURAMET |
| 2016 |
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BIPM.RI(I)-K5, APMP.RI(I)-K5 and EURAMET.RI(I)-K5.1
MEASURAND Air kerma
Radiation quality Cs-137 beam
The key comparison reference value is the BIPM evaluation of air kerma (see International framework of traceability for radiation dosimetry quantities) .
BIPM.RI(I)-K5
The degree of equivalence of each laboratory i with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy:
the relative difference Di and Ui, its expanded uncertainty (k = 2), with Ui = 2ui.
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms both expressed in mGy/Gy:
Dij = Di - Dj and Uij , its expanded uncertainty (k = 2). The approximation for Uij is explained in section 5 of the Final Report.
Linking EURAMET.RI(I)-K5.1 to BIPM.RI(I)-K5
The linking of EURAMET.RI(I)-K5.1 to BIPM.RI(I)-K5 is made via BEV (Austria) who participated in both comparisons.
Linking APMP.RI(I)-K5 to BIPM.RI(I)-K5
The linking of APMP.RI(I)-K5 to BIPM.RI(I)-K5 is made via KRISS (Korea) and NMIJ AIST (Japan) who participated in both comparisons.
BIPM.RI(I)-K5, APMP.RI(I)-K5 and EURAMET.RI(I)-K5.1
MEASURAND Air kerma
Radiation quality Cs-137 beam
xi ratio of the measurement of laboratory i to that of the BIPM
ui combined standard uncertainty of the ratio xi
| Labi | xi | ui | year of measurement | |
| NIST | 0.9990 | 0.0035 | 2011 | |
| NMIJ | 0.9977 | 0.0026 | 2012 | |
| PTB | 1.0024 | 0.0027 | 2014 | |
| NIM | 0.9967 | 0.0021 | 2014 | |
| ININ | 1.0048 | 0.0020 | 2015 | |
| VSL | 0.9952 | 0.0038 | 2016 | |
| SMU | 1.0051 | 0.0027 | 2017 | |
| BEV | 1.0043 | 0.0027 | 2023 | |
| CIEMAT | 0.9992 | 0.0022 | 2023 | |
| GUM | 1.0005 | 0.0028 | 2024 | |
| LNE-LNHB | 0.9970 | 0.0022 | 2024 | |
| KRISS | 0.9992 | 0.0020 | 2025 |
APMP.RI(I)-K5
| Labi | xi | ui | year of measurement | |
| KRISS | 0.9931 | 0.0041 | 2014 | |
| NMIJ | 1.0033 | 0.0043 | 2014 | |
| INER | 0.9954 | 0.0045 | 2014 | |
| CIEMAT | 1.0042 | 0.0086 | 2014 | |
| NIM | 1.0013 | 0.0044 | 2014 |
EURAMET.RI(I)-K5.1
| Labi | xi | ui | year of measurement | |
| VINS | 0.9967 | 0.0101 | 2017 |
