BIPM.RI(I)-K2 and APMP.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.
BIPM.RI(I)-K2 and APMP.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.
Enlarged graph
BIPM.RI(I)-K2 and APMP.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.
Enlarged graph
BIPM.RI(I)-K2 and APMP.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.
Enlarged graph
BIPM.RI(I)-K2 and APMP.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.
Enlarged graph
BIPM.RI(I)-K2 and APMP.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 | ||
| MNA | 42.0 | 14 | ||
| INER | 2.8 | 13 | ||
| IAEA | 4.5 | 11 |
BIPM.RI(I)-K2 and APMP.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 | ||
| MNA | 25.7 | 14 | ||
| BARC | 13.5 | 100 | ||
| INER | 8.6 | 13 | ||
| IAEA | 2.8 | 11 |
BIPM.RI(I)-K2 and APMP.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 | ||
| MNA | 25.9 | 14 | ||
| BARC | 42.8 | 100 | ||
| INER | 8.3 | 13 | ||
| IAEA | 4.3 | 11 |
BIPM.RI(I)-K2 and APMP.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 | ||
| MNA | 34.9 | 14 | ||
| BARC | 30.9 | 100 | ||
| INER | 6.4 | 13 | ||
| IAEA | 4.9 | 11 |
BIPM.RI(I)-K2 and APMP.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 | ||
| MNA | 37.0 | 14 | ||
| BARC | 19.0 | 100 | ||
| INER | 10.2 | 13 | ||
| IAEA | 4.8 | 11 |
| 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 |
| Final Reports of the comparisons | |
| References | |
| 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 comparsion is listed in the tab "Participants" Most recent update made on 18 October 2024 First results published on 25 September 2003 18 September 2009: update following a re-evaluation of the BIPM international standards for air kerma in x-rays - Metrologia, 2009, 46, L21. |
| 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 |
| 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 |
| LSDG |
Laboratorium voor Standaarddosimetrie Gent, Belgium, EURAMET |
| 2006 |
|
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| 1998 | |
| 1998 |
| MKEH |
Hungarian Trade Licensing Office; now BFKH, Hungary, EURAMET |
| 2001 | |
| 2001 | |
| 2011 |
| 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 |
| NMi-VSL |
Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET |
| 1996 | |
| 1996 | |
| 2012 |
| 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 |
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BIPM.RI(I)-K2 and APMP.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).
Linking APMP.RI(I)-K2 to BIPM.RI(I)-K2
The NMIJ/AIST (Japan) provides the link between the key comparison APMP.RI(I)-K2 and BIPM.RI(I)-K2, having participated in both comparisons. The linking process is described in Section 3 of the APMP.RI(I)-K2 Final report.
BIPM.RI(I)-K2 and APMP.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).
Linking APMP.RI(I)-K2 to BIPM.RI(I)-K2
The NMIJ/AIST (Japan) provides the link between the key comparison APMP.RI(I)-K2 and BIPM.RI(I)-K2, having participated in both comparisons. The linking process is described in Section 3 of the APMP.RI(I)-K2 Final report.
BIPM.RI(I)-K2 and APMP.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).
Linking APMP.RI(I)-K2 to BIPM.RI(I)-K2
The NMIJ/AIST (Japan) provides the link between the key comparison APMP.RI(I)-K2 and BIPM.RI(I)-K2, having participated in both comparisons. The linking process is described in Section 3 of the APMP.RI(I)-K2 Final report.
BIPM.RI(I)-K2 and APMP.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).
Linking APMP.RI(I)-K2 to BIPM.RI(I)-K2
The NMIJ/AIST (Japan) provides the link between the key comparison APMP.RI(I)-K2 and BIPM.RI(I)-K2, having participated in both comparisons. The linking process is described in Section 3 of the APMP.RI(I)-K2 Final report.
BIPM.RI(I)-K2 and APMP.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).
Linking APMP.RI(I)-K2 to BIPM.RI(I)-K2
The NMIJ/AIST (Japan) provides the link between the key comparison APMP.RI(I)-K2 and BIPM.RI(I)-K2, having participated in both comparisons. The linking process is described in Section 3 of the APMP.RI(I)-K2 Final report.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
BIPM.RI(I)-K2
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
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| MNA | 1.0420 | 0.0070 | 2008 | |
| INER | 1.0028 | 0.0067 | 2009 | |
| IAEA | 1.0045 | 0.0054 | 2010 | |
| NIM | 1.0147 | 0.0062 | 2010 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
BIPM.RI(I)-K2
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
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| MNA | 1.0257 | 0.0070 | 2008 | |
| BARC | 1.0135 | 0.0500 | 2009 | |
| INER | 1.0086 | 0.0067 | 2009 | |
| IAEA | 1.0028 | 0.0054 | 2010 | |
| NIM | 1.0117 | 0.0062 | 2010 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
BIPM.RI(I)-K2
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
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| MNA | 1.0259 | 0.0070 | 2008 | |
| BARC | 1.0428 | 0.0500 | 2009 | |
| INER | 1.0083 | 0.0067 | 2009 | |
| IAEA | 1.0043 | 0.0054 | 2010 | |
| NIM | 1.0107 | 0.0062 | 2010 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
BIPM.RI(I)-K2
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
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| MNA | 1.0349 | 0.0070 | 2008 | |
| BARC | 1.0309 | 0.0500 | 2009 | |
| INER | 1.0064 | 0.0067 | 2009 | |
| IAEA | 1.0049 | 0.0054 | 2010 | |
| NIM | 1.0078 | 0.0062 | 2010 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
BIPM.RI(I)-K2
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
| Labi | xi | ui | Year of | |
| mGy/Gy | mGy/Gy | measurement | ||
| MNA | 1.0370 | 0.0070 | 2008 | |
| BARC | 1.0190 | 0.0500 | 2009 | |
| INER | 1.0102 | 0.0067 | 2009 | |
| IAEA | 1.0048 | 0.0054 | 2010 | |
| NIM | 1.0061 | 0.0062 | 2010 |
