BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 100 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-g-100kev_jul17.gif)
Diamonds: participants in BIPM.RI(I)-K3 (in black: results that are more than 15 years old)
Blue triangles: participants in APMP.RI(I)-K3
Green circles: participants in SIM.RI(I)-K3
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 135 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-g-135kev_jul17.gif)
Diamonds: participants in BIPM.RI(I)-K3 (in black: results that are more than 15 years old)
Blue triangles: participants in APMP.RI(I)-K3
Green circles: participants in SIM.RI(I)-K3
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 180 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-g-180kev_jul17.gif)
Diamonds: participants in BIPM.RI(I)-K3 (in black: results that are more than 15 years old)
Blue triangles: participants in APMP.RI(I)-K3
Green circles: participants in SIM.RI(I)-K3
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 250 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-g-250kev_jul17.gif)
Diamonds: participants in BIPM.RI(I)-K3 (in black: results that are more than 15 years old)
Blue triangles: participants in APMP.RI(I)-K3
Green circles: participants in SIM.RI(I)-K3
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 100 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-doe-100kev_jul17.gif)
Blue: participants in APMP.RI(I)-K3
Green: participants in SIM.RI(I)-K3
Results are presented under A4 printable format in Summary Results (PDF file).
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 135 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-doe-135kev_jul17.gif)
Blue: participants in APMP.RI(I)-K3
Green: participants in SIM.RI(I)-K3
Results are presented under A4 printable format in Summary Results (PDF file).
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 180 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-doe-180kev_jul17.gif)
Blue: participants in APMP.RI(I)-K3
Green: participants in SIM.RI(I)-K3
Results are presented under A4 printable format in Summary Results (PDF file).
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 250 kV
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in mGy/Gy
-k3-doe-250kev_jul17.gif)
Blue: participants in APMP.RI(I)-K3
Green: participants in SIM.RI(I)-K3
Results are presented under A4 printable format in Summary Results (PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of air kerma for medium energy X-rays |
| Time of measurements | 2007 - 2008 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Air kerma |
| Parameters | Radiation type: X-rays Radiation quality: 100 kV to 250 kV |
| Transfer device | Ionization chambers |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | SIM (Inter-American Metrology System) |
| Comments | The results of this comparison were no longer linked to the continuous comparison BIPM.RI(I)-K3 on 20 April 2026 as the measurements are older than 15 years stated by the CCRI rules. |
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | Michelle O'Brien +1 301 975 2014 |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| CNEA |
National Commission of Atomic Energy, Argentina, SIM |
| ININ |
Instituto Nacional de Investigaciones Nucleares, Mexico, SIM |
| LNMRI |
Laboratorio Nacional de Metrologia das Radiaçoes Ionizantes, IRD, Brazil, SIM |
| NRC |
National Research Council, Canada, SIM |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 100 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 BIPM.RI(I)-K3 Summary Report dated November 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 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 (see the BIPM.RI(I)-K3 Summary Report dated November 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 Final Report). |
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 135 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 BIPM.RI(I)-K3 Summary Report dated November 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 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 (see the BIPM.RI(I)-K3 Summary Report dated November 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 Final Report). |
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 180 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 BIPM.RI(I)-K3 Summary Report dated November 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 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 (see the BIPM.RI(I)-K3 Summary Report dated November 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 Final Report). |
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 250 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 BIPM.RI(I)-K3 Summary Report dated November 2003 or the relevant Final Report). For regional comparisons, additional linking uncertainties are included (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 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 (see the BIPM.RI(I)-K3 Summary Report dated November 2003). For regional comparisons involving secondary standards, this includes correlation related to traceability (see the APMP.RI(I)-K3 Final Report, and SIM.RI(I)-K3 Final Report). |
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 100 kV
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
-k3-lim1-100kev_jul17.gif)
MEASURAND : Air kerma
Radiation quality 100 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories (ARPANSA and PTB) as detailed in the APMP.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim2-100kev_oct16.gif)
"Nuc. Mal." stands for "Nuclear Malaysia"
MEASURAND : Air kerma
Radiation quality 100 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories as detailed in the SIM.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim3-100kev_oct16.gif)
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 135 kV
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
-k3-lim1-135kev_jul17.gif)
MEASURAND : Air kerma
Radiation quality 135 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories (ARPANSA and PTB) as detailed in the APMP.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim2-135kev_oct16.gif)
"Nuc. Mal." stands for "Nuclear Malaysia"
MEASURAND : Air kerma
Radiation quality 135 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories as detailed in the SIM.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim3-135kev_oct16.gif)
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 180 kV
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
-k3-lim1-180kev_jul17.gif)
MEASURAND : Air kerma
Radiation quality 180 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories (ARPANSA and PTB) as detailed in the APMP.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim2-180kev_oct16.gif)
"Nuc. Mal." stands for "Nuclear Malaysia"
MEASURAND : Air kerma
Radiation quality 180 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories as detailed in the SIM.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim3-180kev_oct16.gif)
BIPM.RI(I)-K3, APMP.RI(I)-K3, and SIM.RI(I)-K3
MEASURAND : Air kerma
Radiation quality 250 kV
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
-k3-lim1-250kev_jul17.gif)
MEASURAND : Air kerma
Radiation quality 250 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories (ARPANSA and PTB) as detailed in the APMP.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim2-250kev_oct16.gif)
"Nuc. Mal." stands for "Nuclear Malaysia"
MEASURAND : Air kerma
Radiation quality 250 kV
uLab i : relative standard uncertainty of air-kerma calibration coefficients determined by Lab i
xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard, derived from the calibration coefficients through the results of the linking laboratories as detailed in the SIM.RI(I)-K3 Final Report.
ui : combined standard uncertainty of xi taking correlation into account
-k3-lim3-250kev_oct16.gif)
