BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 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.
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 28 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)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 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.
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 35 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)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 kV,
W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 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)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 23 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.
Radiation qualities W/Mo 28 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.
Radiation qualities W/Mo 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.
Radiation qualities W/Mo 35 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.
Radiation qualities W/Mo 50 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)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 kV,
W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 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)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 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 |
||
PTB | -0.9 | 7.4 | ||
NIST | -2.6 | 6.4 | ||
VNIIM | -3.7 | 4.8 | ||
VSL | -5.6 | 12 | ||
BEV | -4.0 | 6.8 | ||
CMI | 2.8 | 7.0 | ||
NIM | 0.1 | 5.6 | ||
NMIJ | -5.5 | 7.2 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 28 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 |
||
PTB | -0.6 | 7.4 | ||
NIST | -3.2 | 6.4 | ||
VNIIM | -3.0 | 4.8 | ||
VSL | -4.6 | 12.0 | ||
BEV | -3.5 | 7 | ||
CMI | 2.4 | 7.0 | ||
NIM | -0.4 | 5.6 | ||
NMIJ | -4.4 | 7.2 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 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 |
||
PTB | -0.9 | 7.4 | ||
NIST | -3.4 | 6.4 | ||
VNIIM | -2.7 | 4.8 | ||
VSL | -5.3 | 12.0 | ||
BEV | -3.5 | 7 | ||
CMI | 2.7 | 7.0 | ||
NIM | 0.0 | 5.6 | ||
NMIJ | -4.8 | 7.2 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation quality Mo/Mo 35 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 |
||
PTB | -0.5 | 7.4 | ||
NIST | -3.8 | 6.4 | ||
VNIIM | -2.8 | 4.8 | ||
VSL | -4.7 | 12.0 | ||
BEV | -2.5 | 7 | ||
CMI | 2.5 | 7.0 | ||
NIM | 0.2 | 5.6 | ||
NMIJ | -4.3 | 7.2 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 kV,
W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 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)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 23 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 |
||
ENEA-INMRI | -3.8 | 9.6 | ||
NRC | -0.7 | 6.4 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 28 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 |
||
ENEA-INMRI | -3.2 | 9.6 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 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 |
||
ENEA-INMRI | -2.9 | 9.6 | ||
NRC | -1.4 | 6.4 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 35 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 |
||
ENEA-INMRI | -2.8 | 9.6 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 50 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 |
||
NRC | -2.1 | 6.4 |
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 kV,
W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 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.
Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
Description | Measurement of air kerma in mammography beams |
Time of measurements | 2007 - |
Status | Continuous, approved for equivalence |
References | |
Measurand | Air kerma (in mGy) relative to the BIPM evaluation |
Parameters | Radiation type: mammography radiation beams |
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" First results published on 17 November 2011 Last update on 24 November 2021 |
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 |
2014 |
CMI |
Czech Metrology Institute, Czechia, EURAMET |
2015 |
ENEA-INMRI |
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET |
2015 |
NIM |
National Institute of Metrology, China, APMP |
2018 |
- |
NIST |
National Institute of Standards and Technology, United States, SIM |
2010 |
NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
2009 | |
2020 |
NRC |
National Research Council, Canada, SIM |
2007 | |
2018 |
PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
2010 |
VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
2012 |
VSL |
VSL, Netherlands, EURAMET |
2012 |
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BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 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 = 2 ui, its expanded uncertainty (k = 2), both expressed in mGy/Gy.
In evaluating ui for BIPM comparisons, account is taken of correlation between uLab i and uR,i (see the relevant 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.
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 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 = 2 ui, its expanded uncertainty (k = 2), both expressed in mGy/Gy.
In evaluating ui for BIPM comparisons, account is taken of correlation between uLab i and uR,i (see the relevant 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.
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities Mo/Mo 25 kV, Mo/Mo 28 kV, Mo/Mo 30 kV, Mo/Mo 35 kV
u Lab 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 correlations into account
Radiation quality Mo/Mo 25 kV
Radiation quality Mo/Mo 28 kV
Radiation quality Mo/Mo 30 kV
Radiation quality Mo/Mo 35 kV
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities W/Mo 23 kV, W/Mo 28 kV, W/Mo 30 kV, W/Mo 35 kV and W/Mo 50 kV
u Lab 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 correlations into account
Radiation quality W/Mo 23 kV
Radiation quality W/Mo 28 kV
Radiation quality W/Mo 30 kV
Radiation quality W/Mo 35 kV
Radiation quality W/Mo 50 kV