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.

Air kerma 10 kV
Di  (mGy/Gy)
Participating institutes

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.

Air kerma 30 kV
Di  (mGy/Gy)
Participating institutes

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.

Air kerma 25 kV
Di  (mGy/Gy)
Participating institutes

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.

Air kerma 50 kVb
Di  (mGy/Gy)
Participating institutes

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.

Air kerma 50 kVa
Di  (mGy/Gy)
Participating institutes

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
Participating institutes
BIPM.RI(I)-K2
APMP.RI(I)-K2

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
Participating institutes
BIPM.RI(I)-K2
APMP.RI(I)-K2

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
Participating institutes
BIPM.RI(I)-K2
APMP.RI(I)-K2

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
Participating institutes
BIPM.RI(I)-K2
APMP.RI(I)-K2

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
Participating institutes
BIPM.RI(I)-K2
APMP.RI(I)-K2
Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(I)-K2
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

Technical Protocol for ongoing BIPM Dosimetry comparisons

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
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

ARPANSA

Australian Radiation Protection and Nuclear Safety Agency, Australia, APMP

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

CMI

Czech Metrology Institute, Czechia, EURAMET

ENEA-INMRI

Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET

GUM

Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE-LNHB

Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET

LSDG

Laboratorium voor Standaarddosimetrie Gent, Belgium, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

MKEH

Hungarian Trade Licensing Office; now BFKH, Hungary, EURAMET

NIM

National Institute of Metrology, China, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMi-VSL

Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

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 = 2u,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 = 2u,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 = 2u,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 = 2u,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 = 2u,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

 

 

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

 

 

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

 

 

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

 

 

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

 

 

APMP.RI(I)-K2

Measurement data are listed in Section 4 and Appendices of the APMP.RI(I)-K2 Final Report.