MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.63 (included) and 0.71 (excluded), which approximately corresponds to PDD(10) between 63 % (included) and 71 % (excluded)
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.
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.71 (included) and 0.77 (excluded), which approximately corresponds to PDD(10) between 71 % (included) and 78 % (excluded)
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.
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.77 (included) and 0.81 (included), which approximately corresponds to PDD(10) between 78 % (included) and 85 % (included)
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.
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.63 (included) and 0.71 (excluded), which approximately corresponds to PDD(10) between 63 % (included) and 71 % (excluded)
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 |
||
| NIST | 3.5 | 11.4 | ||
| NPL | -2.7 | 12.4 | ||
| VSL | -4.1 | 10.8 | ||
| NMIJ | -3.4 | 9.4 | ||
| NIM | -8.3 | 12.0 | ||
| KRISS | 7.8 | 12.0 | ||
| METAS | -1.7 | 13.2 | ||
| LNE-LNHB | -2.3 | 11.8 | ||
| NRC | 4.0 | 11.6 | ||
| PTB | 2.6 | 11.4 | ||
| ARPANSA | -4.5 | 12.4 |
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.71 (included) and 0.77 (excluded), which approximately corresponds to PDD(10) between 71 % (included) and 78 % (excluded)
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 |
||
| NPL | -0.5 | 13.2 | ||
| VSL | -4.2 | 12.8 | ||
| NMIJ | -4.1 | 11.0 | ||
| NIM | -5.9 | 11.8 | ||
| KRISS | 5.6 | 12.0 | ||
| METAS | -3.2 | 13.2 | ||
| LNE-LNHB | -3.8 | 11.8 | ||
| NRC | 3.0 | 11.6 | ||
| PTB | -0.6 | 11.4 | ||
| ARPANSA | -5.1 | 12.4 |
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
Beam quality corresponding to measured TPR20,10 between 0.77 (included) and 0.81 (included), which approximately corresponds to PDD(10) between 78 % (included) and 85 % (included)
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 |
||
| NIST | -4.2 | 11.8 | ||
| NPL | -4.3 | 16.2 | ||
| VSL | 1.0 | 14.8 | ||
| KRISS | 8.5 | 12.0 | ||
| METAS | -1.2 | 13.2 | ||
| LNE-LNHB | -4.4 | 11.8 | ||
| NRC | 3.9 | 11.6 | ||
| PTB | -0.3 | 11.4 | ||
| ARPANSA | -4.9 | 12.4 |
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of absorbed dose to water for high-energy photon beams |
| Time of measurements | 2009 - |
| Status | Continuous, approved for equivalence |
| References | |
| Measurand | Absorbed dose to water relative to the BIPM evaluation |
| Parameters | Radiation type: accelerator beams - high energy photons |
| 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 8 July 2013 Most recent update on 26 May 2023 |
| 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 |
| ARPANSA |
Australian Radiation Protection and Nuclear Safety Agency, Australia, APMP |
| 2012 | |
| 2022 |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| 2017 |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2012 | |
| 2020 |
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| 2018 |
| NIM |
National Institute of Metrology, China, APMP |
| 2016 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 2010 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 2015 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 2013 | |
| 2014 |
| NRC |
National Research Council, Canada, SIM |
| 2009 | |
| 2020 |
|
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 2010 | |
| 2021 |
| VSL |
VSL, Netherlands, EURAMET |
| 2014 |
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" :
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
The key comparison reference value is the BIPM determination of absorbed dose to water in an accelerator beam.
The degree of equivalence of each laboratory i with respect to the key comparison reference value xR is given by a pair of terms: the relative difference Di and Ui = 2ui, its expanded uncertainty (k = 2), both expressed in mGy/Gy.
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.
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
The key comparison reference value is the BIPM determination of absorbed dose to water in an accelerator beam.
The degree of equivalence of each laboratory i with respect to the key comparison reference value xR is given by a pair of terms: the relative difference Di and Ui = 2ui, its expanded uncertainty (k = 2), both expressed in mGy/Gy.
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.
EASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
The key comparison reference value is the BIPM determination of absorbed dose to water in an accelerator beam.
The degree of equivalence of each laboratory i with respect to the key comparison reference value xR is given by a pair of terms: the relative difference Di and Ui = 2ui, its expanded uncertainty (k = 2), both expressed in mGy/Gy.
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.
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
xi : ratio of the measurement result of the laboratory i to that of the BIPM
ui : combined standard uncertainty of the ratio xi
Beam quality corresponding to measured TPR20,10 between 0.63 (included) and 0.71 (excluded), which approximately corresponds to PDD(10) between 63 % (included) and 71 % (excluded)
| Labi | TPR20,10 | xi | ui | year of measurement | |
| NIST | 0.674 | 1.0035 | 0.0057 | 2010 | |
| NPL | 0.682 | 0.9973 | 0.0062 | 2013 | |
| VSL | 0.682 | 0.9959 | 0.0054 | 2014 | |
| NMIJ | 0.679 | 0.9966 | 0.0047 | 2015 | |
| NIM | 0.687 | 0.9917 | 0.0060 | 2016 | |
| KRISS | 0.686 | 1.0078 | 0.0060 | 2017 | |
| METAS | 0.686 | 0.9983 | 0.0066 | 2018 | |
| LNE-LNHB | 0.665 | 0.9977 | 0.0059 | 2020 | |
| NRC | 0.686 | 1.0040 | 0.0058 | 2020 | |
| PTB | 0.686 | 1.0026 | 0.0057 | 2021 | |
| ARPANSA | 0.686 | 0.9955 | 0.0062 | 2022 |
EASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
xi : ratio of the measurement result of the laboratory i to that of the BIPM
ui : combined standard uncertainty of the ratio xi
Beam quality corresponding to measured TPR20,10 between 0.71 (included) and 0.77 (excluded), which approximately corresponds to PDD(10) between 71 % (included) and 78 % (excluded)
| Labi | TPR20,10 | xi | ui | year of measurement | |
| NPL | 0.733 | 0.9995 | 0.0066 | 2013 | |
| VSL | 0.733 | 0.9958 | 0.0064 | 2014 | |
| NMIJ | 0.744 | 0.9959 | 0.0055 | 2015 | |
| NIM | 0.740 | 0.9941 | 0.0059 | 2016 | |
| KRISS | 0.733 | 1.0056 | 0.0060 | 2017 | |
| METAS | 0.733 | 0.9968 | 0.0066 | 2018 | |
| LNE-LNHB | 0.737 | 0.9962 | 0.0059 | 2020 | |
| NRC | 0.733 | 1.0030 | 0.0058 | 2020 | |
| PTB | 0.733 | 0.9994 | 0.0057 | 2021 | |
| ARPANSA | 0.733 | 0.9949 | 0.0062 | 2021 |
MEASURAND Absorbed dose to water
Radiation quality Accelerator photon beams
xi : ratio of the measurement result of the laboratory i to that of the BIPM
ui : combined standard uncertainty of the ratio xi
Beam quality corresponding to measured TPR20,10 between 0.77 (included) and 0.81 (included), which approximately corresponds to PDD(10) between 78 % (included) and 85 % (included)
| Labi | TPR20,10 | xi | ui | year of measurement | |
| NIST | 0.783 | 0.9958 | 0.0059 | 2010 | |
| NPL | 0.800 | 0.9957 | 0.0081 | 2013 | |
| VSL | 0.800 | 1.0010 | 0.0074 | 2014 | |
| KRISS | 0.774 | 1.0085 | 0.0060 | 2017 | |
| METAS | 0.774 | 0.9988 | 0.0066 | 2018 | |
| LNE-LNHB | 0.790 | 0.9956 | 0.0059 | 2020 | |
| NRC | 0.774 | 1.0039 | 0.0058 | 2020 | |
| PTB | 0.774 | 0.9997 | 0.0057 | 2021 | |
| ARPANSA | 0.774 | 0.9951 | 0.0062 | 2022 |
