BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| LNE-LNHB | -0.8 | 4.0 | ||
| ENEA | -2.2 | 4.5 | ||
| VNIIM | -3.2 | 5.3 | ||
| VSL | 7.8 | 7.0 | ||
| BEV | -2.0 | 14 | ||
| NMIJ | 3.2 | 6.5 | ||
| CMI | 5.5 | 7.4 | ||
| KRISS | -1.6 | 4.4 | ||
| NPL | -12.2 | 4.9 | ||
| NRC | 0.3 | 7.1 | ||
| NIM | -2.3 | 7.7 | ||
| GUM | -5.9 | 5.8 | ||
| ARPANSA | 11.2 | 22 | ||
| PTB | 0.2 | 8.0 |
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| LNE-LNHB | 0.7 | 4.0 | ||
| NIST | 0.0 | 8.7 | ||
| ENEA | -2.4 | 4.5 | ||
| VNIIM | -2.2 | 5.3 | ||
| VSL | 7.5 | 7.0 | ||
| BEV | -1.3 | 9.8 | ||
| NMIJ | -2.3 | 6.5 | ||
| CMI | 4.5 | 7.4 | ||
| KRISS | -1.6 | 4.4 | ||
| NPL | -11.1 | 4.9 | ||
| NRC | -1.4 | 7.1 | ||
| NIM | 0.5 | 7.7 | ||
| GUM | 1.9 | 5.8 | ||
| BFKH | -4.0 | 6.8 | ||
| PTB | -1.1 | 8.0 |
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| LNE-LNHB | 0.2 | 4.0 | ||
| NIST | -3.1 | 8.7 | ||
| ENEA | -3.2 | 4.5 | ||
| VNIIM | -2.1 | 5.3 | ||
| VSL | 6.9 | 7.0 | ||
| BEV | -0.8 | 9.8 | ||
| NMIJ | 1.0 | 6.5 | ||
| CMI | 3.9 | 7.4 | ||
| KRISS | -2.4 | 4.4 | ||
| NPL | -11.4 | 4.9 | ||
| NRC | -2.4 | 7.1 | ||
| NIM | -1.1 | 7.7 | ||
| GUM | 5.2 | 5.8 | ||
| BFKH | -4.3 | 6.8 | ||
| ARPANSA | -7.6 | 9.2 | ||
| PTB | -2.8 | 8.0 |
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| LNE-LNHB | 0.7 | 4.0 | ||
| NIST | -2.6 | 8.7 | ||
| ENEA | -2.1 | 4.5 | ||
| VNIIM | -0.7 | 5.3 | ||
| VSL | 13.0 | 7.0 | ||
| BEV | -1.6 | 9.8 | ||
| NMIJ | -2.6 | 6.5 | ||
| CMI | 4.4 | 7.4 | ||
| KRISS | -1.9 | 4.4 | ||
| NPL | -9.6 | 4.9 | ||
| NRC | 0.4 | 7.1 | ||
| NIM | -3.2 | 7.7 | ||
| GUM | 1.9 | 5.8 | ||
| BFKH | 0.1 | 6.8 | ||
| ARPANSA | -4.8 | 9.2 | ||
| PTB | -5.4 | 8.0 |
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
Degrees of equivalence represented by the relative difference Di = xi - 1 and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
| LNE-LNHB | 0.1 | 4.0 | ||
| NIST | 1.5 | 8.7 | ||
| ENEA | -2.0 | 4.5 | ||
| VNIIM | -1.3 | 5.3 | ||
| VSL | 11.5 | 7.0 | ||
| BEV | -0.8 | 9.8 | ||
| NMIJ | -0.9 | 6.5 | ||
| CMI | 4.2 | 7.4 | ||
| KRISS | -1.8 | 4.4 | ||
| NPL | -10.1 | 4.9 | ||
| NRC | 0.6 | 7.1 | ||
| NIM | -2.5 | 7.7 | ||
| GUM | 3.1 | 5.8 | ||
| BFKH | -0.4 | 6.8 | ||
| ARPANSA | -5.4 | 9.2 | ||
| PTB | -1.2 | 8.0 |
Results generated from APMP.RI(I)-K2, are no longer listed here as they are older than 15 years. Nevertheless, these results can be consulted via their reports as linked in the 'Laboratory Measurements' tab.
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of air kerma for low energy x-rays |
| Time of measurements | 1966 - |
| Status | Continuous, approved for equivalence |
| References |
Technical Protocol for ongoing BIPM Dosimetry comparisons International framework of traceability for radiation dosimetry quantities |
| Measurand | Air kerma rate relative to the BIPM evaluation |
| Parameters | Radiation type: x-rays Radiation quality: 10 kV to 50 kV |
| 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" 18 September 2009: update following a re-evaluation of the BIPM international standards for air kerma in x-rays - Metrologia, 2009, 46, L21. Most recent update of results made on 18 October 2024 Results older than 15 years are no longer considered valid |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Anna VILLEVALDE |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| ARPANSA |
Australian Radiation Protection and Nuclear Safety Agency, Australia, APMP |
| 2008 | |
| 2022 |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| 2001 | |
| 2001 | |
| 2014 |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| 2001 | |
| 2001 | |
| 2011 | |
| 2021 |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| 2015 |
| ENEA-INMRI |
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET |
| 1998 | |
| 1998 | |
| 2011 |
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| 1994 | |
| 1994 | |
| 2010 | |
| 2021 |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| 2017 |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2009 |
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| 1998 | |
| 1998 |
| NIM |
National Institute of Metrology, China, APMP |
| 2018 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1998 | |
| 1998 | |
| 1998 | |
| 2010 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 2004 | |
| 2014 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 1997 | |
| 1997 | |
| 2007 | |
| 2017 |
| NRC |
National Research Council, Canada, SIM |
| 1966 | |
| 1966 | |
| 2007 | |
| 2018 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 1999 | |
| 1999 | |
| 2014 | |
| 2024 |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| 1998 | |
| 1998 | |
| 2011 |
| VSL |
VSL, Netherlands, EURAMET |
| 1996 | |
| 1996 | |
| 2012 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
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BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
For a comparison with Labi the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of Labi with respect to xR,i is given by a pair of terms: Di = xi - 1 where xi is the air kerma determined by Labi relative to the reference value determined by the BIPM standard and Ui = 2ui , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken of correlation between the relative standard uncertainty of air kerma determined by Labi , uLab i and uR,i (see the BIPM.RI(I)-K2 Summary Report dated September 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K2 Final Report).
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms:Dij = Di - Dj and Uij = 2uij , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating uij , account should be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K2 Final Report).
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
For a comparison with Labi the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of Labi with respect to xR,i is given by a pair of terms: Di = xi - 1 where xi is the air kerma determined by Labi relative to the reference value determined by the BIPM standard and Ui = 2ui , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken of correlation between the relative standard uncertainty of air kerma determined by Labi , uLab i and uR,i (see the BIPM.RI(I)-K2 Summary Report dated September 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K2 Final Report).
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms:Dij = Di - Dj and Uij = 2uij , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating uij , account should be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K2 Final Report).
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
For a comparison with Labi the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of Labi with respect to xR,i is given by a pair of terms: Di = xi - 1 where xi is the air kerma determined by Labi relative to the reference value determined by the BIPM standard and Ui = 2ui , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken of correlation between the relative standard uncertainty of air kerma determined by Labi , uLab i and uR,i (see the BIPM.RI(I)-K2 Summary Report dated September 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K2 Final Report).
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms:Dij = Di - Dj and Uij = 2uij , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating uij , account should be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K2 Final Report).
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
For a comparison with Labi the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of Labi with respect to xR,i is given by a pair of terms: Di = xi - 1 where xi is the air kerma determined by Labi relative to the reference value determined by the BIPM standard and Ui = 2ui , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken of correlation between the relative standard uncertainty of air kerma determined by Labi , uLab i and uR,i (see the BIPM.RI(I)-K2 Summary Report dated September 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K2 Final Report).
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms:Dij = Di - Dj and Uij = 2uij , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating uij , account should be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K2 Final Report).
BIPM.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
For a comparison with Labi the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of Labi with respect to xR,i is given by a pair of terms: Di = xi - 1 where xi is the air kerma determined by Labi relative to the reference value determined by the BIPM standard and Ui = 2ui , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken of correlation between the relative standard uncertainty of air kerma determined by Labi , uLab i and uR,i (see the BIPM.RI(I)-K2 Summary Report dated September 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K2 Final Report).
When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms:Dij = Di - Dj and Uij = 2uij , its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating uij , account should be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K2 Final Report).
BIPM.RI(I)-K2
Results from APMP.RI(I)-K2 are no longer listed here as they are older than 15 years and can be consulted in the corresponding Final report hereafter.
MEASURAND Air kerma
Radiation quality 10 kV
BIPM.RI(I)-K2 - Laboratory measurements
xi air kerma determined by Labi at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| LNE-LNHB | 0.9992 | 0.0020 | 2009 | |
| ENEA | 0.9978 | 0.0023 | 2011 | |
| VNIIM | 0.9968 | 0.0027 | 2011 | |
| VSL | 1.0078 | 0.0035 | 2012 | |
| BEV | 0.9980 | 0.0069 | 2014 | |
| NMIJ | 1.0032 | 0.0032 | 2014 | |
| CMI | 1.0055 | 0.0037 | 2015 | |
| KRISS | 0.9984 | 0.0022 | 2017 | |
| NPL | 0.9878 | 0.0024 | 2017 | |
| NRC | 1.0003 | 0.0036 | 2018 | |
| NIM | 0.9977 | 0.0039 | 2018 | |
| GUM | 0.9941 | 0.0029 | 2021 | |
| ARPANSA | 1.0112 | 0.0110 | 2022 | |
| PTB | 1.0002 | 0.0040 | 2024 |
APMP.RI(I)-K2 - Laboratory measurements
BIPM.RI(I)-K2
Results from APMP.RI(I)-K2 are no longer listed here as they are older than 15 years and can be consulted in the corresponding Final report hereafter.
MEASURAND Air kerma
Radiation quality 25 kV
BIPM.RI(I)-K2 - Laboratory measurements
xi air kerma determined by Labi at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| LNE-LNHB | 1.0007 | 0.0020 | 2009 | |
| NIST | 1.0000 | 0.0043 | 2010 | |
| ENEA | 0.9976 | 0.0023 | 2011 | |
| VNIIM | 0.9978 | 0.0027 | 2011 | |
| VSL | 1.0075 | 0.0035 | 2012 | |
| BEV | 0.9987 | 0.0049 | 2014 | |
| NMIJ | 0.9977 | 0.0032 | 2014 | |
| CMI | 1.0045 | 0.0037 | 2015 | |
| KRISS | 0.9984 | 0.0022 | 2017 | |
| NPL | 0.9889 | 0.0024 | 2017 | |
| NRC | 0.9986 | 0.0036 | 2018 | |
| NIM | 1.0005 | 0.0039 | 2018 | |
| GUM | 1.0019 | 0.0029 | 2021 | |
| BFKH | 0.9960 | 0.0034 | 2021 | |
| PTB | 0.9989 | 0.0040 | 2024 |
APMP.RI(I)-K2 - Laboratory measurements
BIPM.RI(I)-K2
Results from APMP.RI(I)-K2 are no longer listed here as they are older than 15 years and can be consulted in the corresponding Final report hereafter.
MEASURAND Air kerma
Radiation quality 30 kV
BIPM.RI(I)-K2 - Laboratory measurements
xi air kerma determined by Labi at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| LNE-LNHB | 1.0002 | 0.0020 | 2009 | |
| NIST | 0.9969 | 0.0043 | 2010 | |
| ENEA | 0.9968 | 0.0023 | 2011 | |
| VNIIM | 0.9979 | 0.0027 | 2011 | |
| VSL | 1.0069 | 0.0035 | 2012 | |
| BEV | 0.9992 | 0.0049 | 2014 | |
| NMIJ | 1.0010 | 0.0032 | 2014 | |
| CMI | 1.0039 | 0.0037 | 2015 | |
| KRISS | 0.9976 | 0.0022 | 2017 | |
| NPL | 0.9886 | 0.0024 | 2017 | |
| NRC | 0.9976 | 0.0036 | 2018 | |
| NIM | 0.9989 | 0.0039 | 2018 | |
| GUM | 1.0052 | 0.0029 | 2021 | |
| BFKH | 0.9957 | 0.0034 | 2021 | |
| ARPANSA | 0.9924 | 0.0046 | 2022 | |
| PTB | 0.9972 | 0.0040 | 2024 |
APMP.RI(I)-K2 - Laboratory measurements
BIPM.RI(I)-K2
Results from APMP.RI(I)-K2 are no longer listed here as they are older than 15 years and can be consulted in the corresponding Final report hereafter.
MEASURAND Air kerma
Radiation quality 50 kVa
BIPM.RI(I)-K2 - Laboratory measurements
xi air kerma determined by Labi at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| LNE-LNHB | 1.0007 | 0.0020 | 2009 | |
| NIST | 0.9974 | 0.0043 | 2010 | |
| ENEA | 0.9979 | 0.0023 | 2011 | |
| VNIIM | 0.9993 | 0.0027 | 2011 | |
| VSL | 1.0130 | 0.0035 | 2012 | |
| BEV | 0.9984 | 0.0049 | 2014 | |
| NMIJ | 0.9974 | 0.0032 | 2014 | |
| CMI | 1.0044 | 0.0037 | 2015 | |
| KRISS | 0.9981 | 0.0022 | 2017 | |
| NPL | 0.9904 | 0.0024 | 2017 | |
| NRC | 1.0004 | 0.0036 | 2018 | |
| NIM | 0.9968 | 0.0039 | 2018 | |
| GUM | 1.0019 | 0.0029 | 2021 | |
| BFKH | 1.0001 | 0.0034 | 2021 | |
| ARPANSA | 0.9952 | 0.0046 | 2022 | |
| PTB | 0.9946 | 0.0040 | 2024 |
APMP.RI(I)-K2 - Laboratory measurements
BIPM.RI(I)-K2
Results from APMP.RI(I)-K2 are no longer listed here as they are older than 15 years and can be consulted in the corresponding Final report hereafter.
MEASURAND Air kerma
Radiation quality 50 kVb
BIPM.RI(I)-K2 - Laboratory measurements
xi air kerma determined by Labi at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| LNE-LNHB | 1.0001 | 0.0020 | 2009 | |
| NIST | 1.0015 | 0.0043 | 2010 | |
| ENEA | 0.9980 | 0.0023 | 2011 | |
| VNIIM | 0.9987 | 0.0027 | 2011 | |
| VSL | 1.0115 | 0.0035 | 2012 | |
| BEV | 0.9992 | 0.0049 | 2014 | |
| NMIJ | 0.9991 | 0.0032 | 2014 | |
| CMI | 1.0042 | 0.0037 | 2015 | |
| KRISS | 0.9982 | 0.0022 | 2017 | |
| NPL | 0.9899 | 0.0024 | 2017 | |
| NRC | 1.0006 | 0.0036 | 2018 | |
| NIM | 0.9975 | 0.0039 | 2018 | |
| GUM | 1.0031 | 0.0029 | 2021 | |
| BFKH | 0.9996 | 0.0034 | 2021 | |
| ARPANSA | 0.9946 | 0.0046 | 2022 | |
| PTB | 0.9988 | 0.0040 | 2024 |
APMP.RI(I)-K2 - Laboratory measurements
