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.
-K7 GRAPH for ALL nov-2021.png)
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities 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 qualities 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 qualities 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 qualities 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 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.
-K7 DoE for ALL nov-2021_1.png)
BIPM.RI(I)-K7
MEASURAND Air kerma
Radiation qualities 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 | ||
| KRISS | -3.5 | 4.0 | ||
| NIM | 0.1 | 5.6 | ||
| NMIJ | -5.5 | 7.2 |
MEASURAND Air kerma
Radiation qualities 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 | ||
| KRISS | -3.6 | 4.0 | ||
| NIM | -0.4 | 5.6 | ||
| NMIJ | -4.4 | 7.2 |
MEASURAND Air kerma
Radiation qualities 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 | 6.8 | ||
| CMI | 2.7 | 7.0 | ||
| KRISS | -3.2 | 4.0 | ||
| NIM | 0.0 | 5.6 | ||
| NMIJ | -4.8 | 7.2 |
MEASURAND Air kerma
Radiation qualities 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 | 7.0 | ||
| CMI | 2.5 | 7.0 | ||
| KRISS | -3.7 | 4.0 | ||
| NIM | 0.2 | 5.6 | ||
| NMIJ | -4.3 | 7.2 |
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of air kerma in mammography beams |
| Time of measurements | 2021 - 2023 |
| Status | Measurements in progress |
| References | |
| Measurand | Air kerma in Mo/Mo mammography beams From 25 kV to 35 kV |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | APMP (Asia Pacific Metrology Programme) |
| Pilot institute |
NIM
National Institute of Metrology China |
| Contact person | Siming GUO |
| Additional |
| Pilot laboratory | |
|---|---|
| NIM |
National Institute of Metrology, China, APMP |
| IAEA |
International Atomic Energy Agency, IAEA - International Organization, EURAMET |
| NIS |
National Institute for Standards, Egypt, AFRIMETS |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NRSL/INER |
Institute of Nuclear Energy Research, Chinese Taipei, APMP |
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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
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
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
-K7 LIM WMo23kV nov-2021.png)
Radiation quality W/Mo 28 kV
-K7-WMo-28.PNG)
Radiation quality W/Mo 30 kV
-K7-WMo-30-NRC.PNG)
Radiation quality W/Mo 35 kV
-K7-WMo-35.PNG)
Radiation quality W/Mo 50 kV
-K7-WMo-50-NRC.PNG)
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
| Labi | uLabi | xi | u(xi) | year of measurement | |
| PTB | 0.0035 | 0.9991 | 0.0037 | 2010 | |
| NIST | 0.0026 | 0.9974 | 0.0032 | 2010 | |
| VNIIM | 0.0024 | 0.9963 | 0.0024 | 2012 | |
| VSL | 0.0058 | 0.9944 | 0.0060 | 2012 | |
| BEV | 0.0038 | 0.9960 | 0.0034 | 2014 | |
| CMI | 0.0047 | 1.0028 | 0.0035 | 2015 | |
| KRISS | 0.0041 | 0.9965 | 0.0020 | 2017 | |
| NIM | 0.0034 | 1.0001 | 0.0028 | 2018 | |
| NMIJ | 0.0049 | 0.9945 | 0.0036 | 2020 |
Radiation quality Mo/Mo 28 kV
| Labi | uLabi | xi | u(xi) | year of measurement | |
| PTB | 0.0035 | 0.9994 | 0.0037 | 2010 | |
| NIST | 0.0026 | 0.9968 | 0.0032 | 2010 | |
| VNIIM | 0.0024 | 0.9970 | 0.0024 | 2012 | |
| VSL | 0.0058 | 0.9954 | 0.0060 | 2012 | |
| BEV | 0.0038 | 0.9965 | 0.0034 | 2014 | |
| CMI | 0.0047 | 1.0024 | 0.0035 | 2015 | |
| KRISS | 0.0041 | 0.9964 | 0.0020 | 2017 | |
| NIM | 0.0034 | 0.9996 | 0.0028 | 2018 | |
| NMIJ | 0.0049 | 0.9956 | 0.0036 | 2020 |
Radiation quality Mo/Mo 30 kV
| Labi | uLabi | xi | u(xi) | year of measurement | |
| PTB | 0.0035 | 0.9991 | 0.0037 | 2010 | |
| NIST | 0.0026 | 0.9966 | 0.0032 | 2010 | |
| VNIIM | 0.0024 | 0.9973 | 0.0024 | 2012 | |
| VSL | 0.0058 | 0.9947 | 0.0060 | 2012 | |
| BEV | 0.0038 | 0.9965 | 0.0034 | 2014 | |
| CMI | 0.0047 | 1.0027 | 0.0035 | 2015 | |
| KRISS | 0.0041 | 0.9968 | 0.0020 | 2017 | |
| NIM | 0.0034 | 1.0000 | 0.0028 | 2018 | |
| NMIJ | 0.0049 | 0.9952 | 0.0036 | 2020 |
Radiation quality Mo/Mo 35 kV
| Labi | uLabi | xi | u(xi) | year of measurement | |
| PTB | 0.0035 | 0.9995 | 0.0037 | 2010 | |
| NIST | 0.0026 | 0.9962 | 0.0032 | 2010 | |
| VNIIM | 0.0024 | 0.9972 | 0.0024 | 2012 | |
| VSL | 0.0058 | 0.9953 | 0.0060 | 2012 | |
| BEV | 0.0038 | 0.9975 | 0.0034 | 2014 | |
| CMI | 0.0047 | 1.0025 | 0.0035 | 2015 | |
| KRISS | 0.0041 | 0.9963 | 0.0020 | 2017 | |
| NIM | 0.0034 | 1.0002 | 0.0028 | 2018 | |
| NMIJ | 0.0049 | 0.9957 | 0.0036 | 2020 |
