Comparison
Comparison close

BIPM.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.1

 

MEASURAND                 Air kerma

Radiation quality        Co-60 beam

 

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.

Air kerma
Di  (mGy/Gy)
Participating institutes
Comparison
Comparison close

BIPM.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.1

 

MEASURAND                 Air kerma

Radiation quality        Co-60 beam

 

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
VNIIM 0.8 3.6
KRISS -0.5 3.2
NIST 3.9 6.8
NMIJ 1.2 4.4
ININ 3.5 4.2
LNE-LNHB -0.6 3.6
PTB 3.6 3.4
ENEA-INMRI -0.1 4.4
NIM -0.3 5.4
IST-LPSR 2.6 3.4
MKEH 4.7 3.8
SCK·CEN 2.1 5.2
SMU 4.2 5.4
NPL -0.4 6.0
VSL -3.7 4.2
BEV 3.0 5.0
GUM 3.9 6.0
ARPANSA -1.4 5.5
NRC 2.2 4.4
BELGIM 12.5 21.8
CPHR 1.1 9.6
RMTC -3.6 9.6
CMI -5.8 14.1
SSM 1.0 7.5
STUK -2.3 7.3
NRPA 5.1 7.1
IAEA 0.0 7.5
HIRCL 4.2 11.9
BIM -4.5 13.0
LNMRI 2.4 13.7
CNEA 1.8 10.0
BARC 0.7 7.6
Nuclear Malaysia -0.1 7.4
NMISA 0.9 6.9
INER 0.5 6.9
DMSC -4.5 7.8
NIS -12.1 14.6
VINS 2.4 10.2
METAS 0.1 10.5
CIEMAT 0.7 7.6
Participating institutes
BIPM.RI(I)-K1 (older that 10 y)
BIPM.RI(I)-K1
COOMET.RI(I)-K1
EUROMET.RI(I)-K1
APMP.RI(I)-K1
APMP.RI(I)-K1.1
EURAMET.RI(I)-K1.2
EURAMET.RI(I)-K1.1
BIPM.RI(I)-K1
Metrology area, Sub-field Ionizing Radiation, Section I (x and gamma rays, electrons)
Description Measurement of air kerma for Cobalt 60
Time of measurements 1975 -
Status Continuous, approved for equivalence
Final Reports of the comparisons
References

Technical Protocol for ongoing BIPM Dosimetry comparisons

Measurand Air kerma rate relative to the BIPM evaluation
Parameters Radiation type: Co-60 gamma rays
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: 16 December 2021
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

BARC

Bhabha Atomic Research Centre, India, APMP

Abandoned

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

BIM

Bulgarian Institute of Metrology, Bulgaria, EURAMET

DMDM

Directorate of Measures and Precious Metals, Serbia, EURAMET

ENEA-INMRI

Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET

GUM

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

ININ

Instituto Nacional de Investigaciones Nucleares, Mexico, SIM

IST-LPSR

Laboratório de Proteção e Segurança Radiológica, Instituto Superior Técnico, Portugal, EURAMET

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

LNMRI

Laboratorio Nacional de Metrologia das Radiaçoes Ionizantes, IRD, Brazil, SIM

METAS

Federal Institute of Metrology, Switzerland, EURAMET

MKEH

Hungarian Trade Licensing Office; now BFKH, Hungary, 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

SCK.CEN/LNK

Nuclear Calibration Laboratory, Belgian Nuclear Research Centre, Belgium, EURAMET

SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

UDZ

Ustav Dozimetrie Zàreni, Czechia, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

VSL

VSL, Netherlands, EURAMET

Comparison
Comparison close

BIPM.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.1

 

MEASURAND                 Air kerma

Radiation quality        Co-60 beam

 

The key comparison reference value is the BIPM evaluation of air kerma.

 

BIPM.RI(I)-K1

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 COOMET.RI(I)-K1 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in COOMET.RI(I)-K1 and is linked to the BIPM.RI(I)-K1 via PTB and SMU (see COOMET.RI(I)-K1 Final Report).

The degree of equivalence of each laboratory i participant in COOMET.RI(I)-K1 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).

See COOMET.RI(I)-K1 Final Report for the approximation used for Ui in the table of degrees of equivalence.

The degree of equivalence between two laboratories i and j is given 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 given in COOMET.RI(I)-K1 Final Report.

 

Linking EUROMET.RI(I)-K1 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in EUROMET.RI(I)-K1 and is linked to the BIPM.RI(I)-K1 via the seven linking laboratories ARPANSA, BEV, ENEA-INMRI, LNE-LNHB, MKEH, NRC and VSL (see EUROMET.RI(I)-K1 Final Report).

The degree of equivalence of each laboratory i participant in EUROMET.RI(I)-K1 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).

See EUROMET.RI(I)-K1 Final Report for the approximation used for Ui in the table of degrees of equivalence.

The degree of equivalence between two laboratories i and j is given 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 given in EUROMET.RI(I)-K1 Final Report.

 

Linking APMP.RI(I)-K1 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in APMP.RI(I)-K1 and is linked to the BIPM.RI(I)-K1 via ARPANSA and NMIJ-AIST (see APMP.RI(I)-K1 Final Report).

The degree of equivalence of each laboratory i participant in APMP.RI(I)-K1 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). (see Section 5 of the APMP.RI(I)-K1 Final Report).

The degree of equivalence between two laboratories i and j is given 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 given in APMP.RI(I)-K1 Final Report.

 

Linking APMP.RI(I)-K1.1 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in APMP.RI(I)-K1.1 and is linked to the BIPM.RI(I)-K1 via ARPANSA and NMIJ-AIST (see APMP.RI(I)-K1.1 Final Report).

The degree of equivalence of each laboratory i participant in APMP.RI(I)-K1.1 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) (see Section 5 of the APMP.RI(I)-K1 Final Report).

The degree of equivalence between two laboratories i and j is given 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 given in APMP.RI(I)-K1.1 Final Report.

 


Linking EURAMET.RI(I)-K1.2 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in EURAMET.RI(I)-K1.2 and is linked to the BIPM.RI(I)-K1 via BEV (see EURAMET.RI(I)-K1.2 Final Report).

The degree of equivalence of each laboratory i participant in EURAMET.RI(I)-K1.2 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 EURAMET.RI(I)-K1.1 to BIPM.RI(I)-K1

The relative value xi is the comparison result for laboratory i participant in EURAMET.RI(I)-K1.1 and is linked to the BIPM.RI(I)-K1 via BEV, LNE-LNHB and VSL (see EURAMET.RI(I)-K1.1 Final Report).

The degree of equivalence of each laboratory i participant in EURAMET.RI(I)-K1.1 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).


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

In general, only the most recent degree of equivalence is retained for those laboratories which participated in two key comparisons.

Degrees of equivalence obtained in SIM.RI(I)-K1 are superseeded by more recent results.

Comparison
Comparison close

BIPM.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.1

 

MEASURAND                 Air kerma

Radiation quality        Co-60 beam

 

BIPM.RI(I)-K1 - Laboratory measurements

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

 

 

COOMET.RI(I)-K1 - Laboratory measurements

xi : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard through the PTB and SMU measurements at the BIPM (see COOMET.RI(I)-K1 Final Report)

ui : combined standard uncertainty of xi

 

 

 

EUROMET.RI(I)-K1 - Laboratory measurements

MEASURAND : Air kerma

xi : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through the ARPANSA, BEV, ENEA-INMRI, LNE-LNHB, MKEH, NRC and VSL measurements at the BIPM.

ui : combined standard uncertainty of xi

 

 

APMP.RI(I)-K1 - Laboratory measurements

xi : air kerma detrmined by Lab , relative to the reference value determined by the BIPM standard through ARPANSA and NMIJ AIST measurements at the BIPM

ui : combined standard uncertainty of xi

APMP.RI(I)-K1 measurements were carried out between August 2004 and May 2006

 

 

 

APMP.RI(I)-K1.1 - Laboratory measurements

xi : air kerma detrmined by Lab , relative to the reference value determined by the BIPM standard through ARPANSA and NMIJ AIST measurements at the BIPM

ui : combined standard uncertainty of xi

 

 

EURAMET.RI(I)-K1.2 - Laboratory measurements

xi : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through BEV measurements at the BIPM

ui : combined standard uncertainty of xi

 

 

EURAMET.RI(I)-K1.1 - Laboratory measurements

See Section 4 of the EURAMET.RI(I)-K1.1 Final Report.