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) /xand its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.

TPR20,10[0.63 ; 0.71)
Di / (mGy/Gy)
Participating institutes

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) /xand its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.

TPR20,10[0.71 ; 0.77)
Di / (mGy/Gy)
Participating institutes

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) /xand its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.

TPR20,10[0.77 ; 0.81]
Di / (mGy/Gy)
Participating institutes

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) /xand 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
ARPANSA -3.5 11.0
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
Participating institutes
BIPM.RI(I)-K6

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) /xand 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
ARPANSA -7.6 12.0
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
Participating institutes
BIPM.RI(I)-K6

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) /xand 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
ARPANSA -6.8 11.8
NPL -4.3 16.2
VSL -0.9 15.0
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
Participating institutes
BIPM.RI(I)-K6
Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(I)-K6
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

BIPM.RI(I)-K6 Technical Protocol

Metrologia 2013 50 Tech. Suppl. 06016

Measurand Absorbed dose to water relative to the BIPM evaluation
Parameters Radiation type: accelerator beams - high energy photons
Transfer device Calorimeters
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 14 April 2022
Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person C. Kessler

+33 (0) 1 45 07 70 84
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

ARPANSA

Australian Radiation Protection and Nuclear Safety Agency, Australia, APMP

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE-LNHB

Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

NIM

National Institute of Metrology, China, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

VSL

VSL, Netherlands, EURAMET

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.

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

 

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)

 

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 0.71 (included) and 0.77 (excluded), which approximately corresponds to PDD(10) between 71 % (included) and 78 % (excluded)

 

*  Average of comparison results of TPR20,10 at 0.729 and 0.758.

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)