BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
Degrees of equivalence represented by Di = (xI - xR) /xR 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 Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
For a graph with an enlarged scale, please click here.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
Degrees of equivalence represented by Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
For a graph with an enlarged scale, please click here.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
Degrees of equivalence represented by Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
For a graph with an enlarged scale, please click here.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
Degrees of equivalence represented by Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
For a graph with an enlarged scale, please click here.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
Degrees of equivalence represented by Di = (xI - xR) /xR 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 |
||
| METAS | 2.2 | 4.2 | ||
| ARPANSA | -1.5 | 14.2 | ||
| LNE-LNHB | -0.8 | 4.0 | ||
| ENEA | -2.2 | 4.5 | ||
| MKEH | -2.7 | 4.7 | ||
| VNIIM | -3.2 | 5.3 | ||
| VSL | 7.8 | 7.0 | ||
| PTB | 0.3 | 4.9 | ||
| BEV | -2.0 | 13.8 | ||
| 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 | ||
| MNA | 42.0 | 14.0 | ||
| INER | 2.8 | 13.4 | ||
| IAEA | 4.5 | 10.8 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
Degrees of equivalence represented by Di = (xI - xR) /xR 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 |
||
| METAS | 1.0 | 4.2 | ||
| ARPANSA | -2.5 | 7.9 | ||
| LNE-LNHB | 0.2 | 4.0 | ||
| NIST | -3.1 | 8.7 | ||
| ENEA | -3.2 | 4.5 | ||
| MKEH | -2.5 | 4.7 | ||
| VNIIM | -2.1 | 5.3 | ||
| VSL | 6.9 | 7.0 | ||
| PTB | -1.8 | 4.9 | ||
| 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 | ||
| MNA | 25.7 | 14.0 | ||
| BARC | 13.5 | 100.0 | ||
| INER | 8.6 | 13.4 | ||
| IAEA | 2.8 | 10.8 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
Degrees of equivalence represented by Di = (xI - xR) /xR 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 |
||
| METAS | 1.3 | 4.2 | ||
| ARPANSA | -2.6 | 7.9 | ||
| LNE-LNHB | 0.7 | 4.0 | ||
| NIST | 0.0 | 8.7 | ||
| ENEA | -2.4 | 4.5 | ||
| MKEH | -1.2 | 4.7 | ||
| VNIIM | -2.2 | 5.3 | ||
| VSL | 7.5 | 7.0 | ||
| PTB | -2.1 | 4.9 | ||
| 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 | ||
| MNA | 25.9 | 14.0 | ||
| BARC | 42.8 | 100.0 | ||
| INER | 8.3 | 13.4 | ||
| IAEA | 4.3 | 10.8 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
Degrees of equivalence represented by Di = (xI - xR) /xR 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 |
||
| METAS | 0.2 | 4.2 | ||
| ARPANSA | -1.0 | 7.9 | ||
| LNE-LNHB | 0.1 | 4.0 | ||
| NIST | 1.5 | 8.7 | ||
| ENEA | -2.0 | 4.5 | ||
| MKEH | -2.6 | 4.7 | ||
| VNIIM | -1.3 | 5.3 | ||
| VSL | 11.5 | 7.0 | ||
| PTB | -1.1 | 4.9 | ||
| 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 | ||
| MNA | 34.9 | 14.0 | ||
| BARC | 30.9 | 100.0 | ||
| INER | 6.4 | 13.4 | ||
| IAEA | 4.9 | 10.8 |
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
Degrees of equivalence represented by Di = (xI - xR) /xR 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 |
||
| METAS | 0.1 | 4.2 | ||
| ARPANSA | 0.2 | 7.9 | ||
| LNE-LNHB | 0.7 | 4.0 | ||
| NIST | -2.6 | 8.7 | ||
| ENEA | -2.1 | 4.5 | ||
| MKEH | -3.4 | 4.7 | ||
| VNIIM | -0.7 | 5.3 | ||
| VSL | 13.0 | 7.0 | ||
| PTB | -0.6 | 4.9 | ||
| 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 | ||
| MNA | 37.0 | 14.0 | ||
| BARC | 19.0 | 100.0 | ||
| INER | 10.2 | 13.4 | ||
| IAEA | 4.8 | 10.8 |
| 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 | Free air chamber |
| 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 11 July 2022 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 | D. T. Burns +33 (0) 1 45 07 70 80 |
| 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 |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| 2001 | |
| 2001 | |
| 2014 |
| 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 |
| 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 |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| 1998 | |
| 1998 | |
| 2011 |
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 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 10 kV
For a comparison with laboratory i, the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of laboratory i with respect to xR,i is given by a pair of terms: Di and Ui = 2ui ,its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken ofcorrelation between 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 , accountshould be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regionalcomparisons 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 laboratory i, the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of laboratory i with respect to xR,i is given by a pair of terms: Di and Ui = 2ui ,its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken ofcorrelation between 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 , accountshould be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regionalcomparisons 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 laboratory i, the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of laboratory i with respect to xR,i is given by a pair of terms: Di and Ui = 2ui ,its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken ofcorrelation between 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 , accountshould be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regionalcomparisons 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 laboratory i, the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of laboratory i with respect to xR,i is given by a pair of terms: Di and Ui = 2ui ,its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken ofcorrelation between 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 , accountshould be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regionalcomparisons 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 laboratory i, the key comparison reference value is the BIPM air-kerma determination xR,i and its standard uncertainty uR,i.
The degree of equivalence of laboratory i with respect to xR,i is given by a pair of terms: Di and Ui = 2ui ,its expanded uncertainty (k = 2), both expressed in mGy/Gy. In evaluating ui for BIPM comparisons, account is taken ofcorrelation between 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 , accountshould be taken of correlation between ui and uj (see the BIPM.RI(I)-K2 Summary Report dated September 2003). For regionalcomparisons 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
uLab i relative standard uncertainty of air kerma determined by Lab i
xi air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
-K2 LIM 10 kV 2022-07-06.png)
APMP.RI(I)-K2
Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 30 kV
BIPM.RI(I)-K2
uLab i relative standard uncertainty of air kerma determined by Lab i
xi air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
-K2 LIM 30 kV 2022-07-06.png)
APMP.RI(I)-K2
Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 25 kV
BIPM.RI(I)-K2
uLab i relative standard uncertainty of air kerma determined by Lab i
xi air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
-K2 LIM 25 kV 2022-07-06.png)
APMP.RI(I)-K2
Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVb
BIPM.RI(I)-K2
uLab i relative standard uncertainty of air kerma determined by Lab i
xi air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
-K2 LIM 50 kVb 2022-07-06.png)
APMP.RI(I)-K2
Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.
BIPM.RI(I)-K2 and APMP.RI(I)-K2
MEASURAND Air kerma
Radiation quality 50 kVa
BIPM.RI(I)-K2
uLab i relative standard uncertainty of air kerma determined by Lab i
xi air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
ui combined standard uncertainty of xi taking correlation into account
-K2 LIM 50 kVa 2022-07-06.png)
APMP.RI(I)-K2
Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.
