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.

Mo/Mo 25 kV
Di  (mGy/Gy)
Participating institutes

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.

Mo/Mo 28 kV
Di  (mGy/Gy)
Participating institutes

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.

Mo/Mo 30 kV
Di  (mGy/Gy)
Participating institutes

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.

Mo/Mo 35 kV
Di  (mGy/Gy)
Participating institutes

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.

W/Mo 23 kV
Di  (mGy/Gy)
Participating institutes

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.

W/Mo 28 kV
Di  (mGy/Gy)
Participating institutes

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.

W/Mo 30 kV
Di  (mGy/Gy)
Participating institutes

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.

W/Mo 35 kV
Di  (mGy/Gy)
Participating institutes

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.

W/Mo 50 kV
Di  (mGy/Gy)
Participating institutes

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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
Participating institutes
BIPM.RI(I)-K7

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.

 

Comparison
Comparison close
BIPM comparison
Linked comparison
APMP.RI(I)-K7
Metrology area, Sub-field Ionizing Radiation, Section I (x and gamma rays, electrons)
Description Measurement of air kerma in mammography beams
Status Measurements in progress
References

Protocol

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

National Institute of Metrology, China, APMP

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

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

 

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

 

 

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