BIPM.RI(I)-K4, SIM.RI(I)-K4, EUROMET.RI(I)-K4, EURAMET.RI(I)-K4.2, EURAMET.RI(I)-K4.1 and APMP.RI(I)-K4

 

MEASURAND                 Absorbed dose to water

Radiation quality        Co-60 beam

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)

Absorbed dose to water
Di  (mGy/Gy)
Participating institutes

The SIM.RI(I)-K4 results data are no longer included for Degrees of Equivalence being older than 15 years.

BIPM.RI(I)-K4, SIM.RI(I)-K4, EUROMET.RI(I)-K4, EURAMET.RI(I)-K4.2, EURAMET.RI(I)-K4.1 and APMP.RI(I)-K4

 

MEASURAND                 Absorbed dose to water

Radiation quality        Co-60 beam

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)

LABi Di Uneg,i Upos,i
mGy/Gy
mGy/Gy
mGy/Gy
ENEA -0.1 8.8
VNIIFTRI -1.4 8.6
NMIJ -3.0 9.2
LNE-LNHB -1.9 7.8
METAS 1.1 10
PTB -1.3 7.6
NPL 2.3 14
VSL -3.0 9.6
BEV -0.3 8.2
GUM 3.0 7.0
ARPANSA -0.5 10
NRC -0.5 6.8
NIM 2.7 7.2
CMI -4.0 24
RMTC -5.3 12
SSM -1.4 10
STUK -3.9 8.5
NRPA 3.2 8.8
SMU -4.7 25
IAEA -0.4 10
HIRCL 3.0 12
ITN -7.1 13
NIST -0.6 11
LNMRI 1.0 15
CNEA 12 18
SCK-CEN -1.5 16
CIEMAT 2.3 11
VINS 0.0 14
Nuc. Malaysia -1.7 14
AECS-NRLM 0.7 24
KRISS -3.3 8.0
NMISA -0.1 11
BRMD, DMSc 1.8 11
BARC 3.2 11
PTKMR-BATAN 2.3 19
NRSL/INER -1.9 8.2
NIS 0.3 14
Participating institutes
BIPM.RI(I)-K4 (older that 10 y)
BIPM.RI(I)-K4
EUROMET.RI(I)-K4
EUROMET.RI(I)-K4.1
EUROMET.RI(I)-K4.2
APMP.RI(I)-K4

The SIM.RI(I)-K4 results data are no longer included for Degrees of Equivalence being older than 15 years.

BIPM.RI(I)-K4
Metrology area, Sub-field Ionizing Radiation, Section I (x and gamma rays, electrons)
Description Measurement of absorbed dose to water for Cobalt 60
Time of measurements 1993 -
Status Continuous, approved for equivalence
References

Technical Protocol for ongoing BIPM Dosimetry comparisons

Re-evaluation of the BIPM.RI(I)-K4 key comparison (2018)

Measurand Absorbed dose to water relative to the BIPM evaluation
Parameters Radiation type: Co-60
Therapy
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"
Most recent update of results made on 27 June 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

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

ENEA-INMRI

Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET

GUM

Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

LNE-LNHB

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

LSDG

Laboratorium voor Standaarddosimetrie Gent, Belgium, 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

NMi-VSL

Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

OMH

Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

VNIIFTRI

Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET

VSL

VSL, Netherlands, EURAMET

BIPM.RI(I)-K4, SIM.RI(I)-K4, EUROMET.RI(I)-K4, EURAMET.RI(I)-K4.2, EURAMET.RI(I)-K4.1 and APMP.RI(I)-K4

 

MEASURAND                 Absorbed dose to water

Radiation quality        Co-60 beam

 

The key comparison reference value is the BIPM evaluation of absrobed dose to water.

 

BIPM.RI(I)-K4

The degree of equivalence of each laboratory i with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy:
the relative difference Di and Ui, its expanded uncertainty (k = 2), with Ui = 2ui.

When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms both expressed in mGy/Gy:

Dij = Di - Dj  and Uij  , its expanded uncertainty (k = 2). The approximation for Uij is explained in section 5 of the Final Report.

 

 

Linking SIM.RI(I)-K4 to BIPM.RI(I)-K4

The relative value xi is the comparison result for laboratory i participant in SIM.RI(I)-K4 and was normalized to the value of NRC acting as the linking laboratory (see SIM.RI(I)-K4 Final Report).

The degree of equivalence of each laboratory i participant in SIM.RI(I)-K4 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di = (xi - 1) x 1000 and Ui, its expanded uncertainty (k = 2).

 

 

Linking EUROMET.RI(I)-K4 to BIPM.RI(I)-K4

The relative value xi is the comparison result for laboratory i participant in EUROMET.RI(I)-K4 and is linked to the BIPM.RI(I)-K4 via the nine linking laboratories ARPANSA, BEV, ENEA-INMRI, LNE-LNHB, METAS, MKEH, NRC, PTB and VSL (see EUROMET.RI(I)-K4 Final Report).

The degree of equivalence of each laboratory i participant in EUROMET.RI(I)-K4 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di = (xi - 1) x 1000 and Ui, its expanded uncertainty (k = 2).

 


Linking EURAMET.RI(I)-K4.1 to BIPM.RI(I)-K4

The linking of EURAMET.RI(I)-K4.1 to BIPM.RI(I)-K4 was made via BEV, LNE-LNHB and METAS, having participated in both comparisons.

The degree of equivalence of each laboratory i participant in EURAMET.RI(I)-K4.1 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di = (xi - 1) x 1000 and Ui, its expanded uncertainty (k = 2).

 

Linking EURAMET.RI(I)-K4.2 to BIPM.RI(I)-K4

The linking of EURAMET.RI(I)-K4.2 to BIPM.RI(I)-K4 was made via BEV having participated in both comparisons.

The degree of equivalence of each laboratory i participant in EURAMET.RI(I)-K4.2 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di = (xi - 1) x 1000 and Ui, its expanded uncertainty (k = 2).

 

Linking APMP.RI(I)-K4 to BIPM.RI(I)-K4

The linking of APMP.RI(I)-K4 to BIPM.RI(I)-K4 was made via ARPANSA, NMIJ-AIST and PTB having participated in both comparisons.

The degree of equivalence of each laboratory i participant in APMP.RI(I)-K4 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di = (xi - 1) x 1000 and Ui, its expanded uncertainty (k = 2).


Following decision of the CCRI in 2011, the pair-wise degrees of equivalence are not explicitely published in the KCDB.

BIPM.RI(I)-K4, SIM.RI(I)-K4, EUROMET.RI(I)-K4, EURAMET.RI(I)-K4.2, EURAMET.RI(I)-K4.1 and APMP.RI(I)-K4

 

MEASURAND                 Absorbed dose to water

Radiation quality        Co-60 beam

 

BIPM.RI(I)-K4 - Laboratory measurements

xi : ratio of the measurement made at the BIPM by laboratory i to that of the BIPM
ui : combined standard uncertainty of the ratio xi

 

 

SIM.RI(I)-K4 - Laboratory measurements

xi : result of measurement carried out at laboratory i converted to absorbed dose through the NRC measurements at the BIPM (See SIM.RI(I)-K4 Final Report)
ui : combined standard uncertainty of xi

 

EUROMET.RI(I)-K4 - Laboratory measurements

xi : result of measurement carried out at laboratory i converted to absorbed dose through nine NMI measurements at the BIPM (See EUROMET.RI(I)-K4 Final Report)
The linking laboratories are MKEH, LNE-LNHB, PTB, ENEA, ARPANSA, NRC, BEV, METAS and VSL.
ui : combined standard uncertainty of xi

 

EURAMET.RI(I)-K4.2 - Laboratory measurements

xi : result of measurement carried out at laboratory i  linked via BEV, LNE-LNHB and METAS.
ui : combined standard uncertainty of xi

 

EURAMET.RI(I)-K4.1 - Laboratory measurements

xi : result of measurement carried out at laboratory i  linked via BEV.
ui : combined standard uncertainty of xi

 

 

APMP.RI(I)-K4 - Laboratory measurements

xi : result of measurement carried out at laboratory i  linked via ARPANSA, NMIJ-AIST and PTB.
ui : combined standard uncertainty of xi