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 Co60 beam
Degrees of equivalence represented by D_{i} = (x_{I}  x_{R})/x_{R} and its expanded uncertainty U_{i} at a 95 % level of confidence, both expressed in mGy/Gy.
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 Co60 beam
Degrees of equivalence represented by D_{i} = (x_{I}  x_{R})/x_{R} and its expanded uncertainty U_{i} at a 95 % level of confidence, both expressed in mGy/Gy.
LAB_{i}  D_{i}  U_{neg,i}  U_{pos,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  
LNELNHB  0.6  3.6  
PTB  3.6  3.4  
ENEAINMRI  0.1  4.4  
NIM  0.3  5.4  
ISTLPSR  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 
Metrology area, Subfield  Ionizing Radiation, Section I (x and gamma rays, electrons) 
Description  Measurement of air kerma for Cobalt 60 
Time of measurements  2005  2008 
Status  Approved for equivalence 
Final Reports of the comparisons  
References  
Measurand  Air kerma rate in mGy/nC 
Parameters  Radiation type: Co60 gamma rays 
Transfer device  Two ionization chambers and electrometers 
Comparison type  Key Comparison 
Consultative Committee  CCRI (Consultative Committee for Ionizing Radiation) 
Conducted by  EURAMET (European Association of National Metrology Institutes) 
RMO Internal Identifier  EUROMET Project No 813 
Comments  Last update of results: 14 November 2018 COOMET.RI(I)K1, EUROMET.RI(I)K1, APMP.RI(I)K1, APMP.RI(I)K1.1.2010 and EURAMET.RI(I)K1.2 results are linked to those of BIPM.RI(I)K1 Air kerma in Cobalt60

Pilot institute 
IAEA
International Atomic Energy Agency IAEA  International Organization 
Contact person  I. Csete +43 2600 28328 
Pilot laboratory  

IAEA 
International Atomic Energy Agency, IAEA  International Organization, EURAMET 
ARPANSA 
Australian Radiation Protection and Nuclear Safety Agency, Australia, APMP 
BEV 
Bundesamt für Eich und Vermessungswesen, Austria, EURAMET 
BIM 
Bulgarian Institute of Metrology, Bulgaria, EURAMET 
CIEMAT 
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET 
CMI 
Czech Metrology Institute, Czechia, EURAMET 
CNEA 
National Commission of Atomic Energy, Argentina, SIM 
ENEAINMRI 
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET 
GUM 
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET 
HIRCL 
Helenic Ionizing Radiation Calibration Laboratory, Greece, EURAMET 
IRB 
Rudjer Boskovic Institute; became: Secondary Standard Dosimetry Laboratory of the Ruder Boskovic Institute, HMI/IRBSSDL, Croatia, EURAMET 
IST/ITN 
Instituto Tecnológico e Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa (became ISTLPSR), Portugal, EURAMET 
LNELNHB 
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 
NIST 
National Institute of Standards and Technology, United States, SIM 
NRC 
National Research Council, Canada, SIM 
NRPA 
Norvegian Radiation Protection Authority, Norway, EURAMET 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
RMTC 
Radiation Metrology and Testing Centre, Latvia, EURAMET 
SMU 
Slovensky Metrologicky Ustav, Slovakia, EURAMET 
SSM 
Swedish Radiation Safety Authority, Sweden, EURAMET 
STUK 
Radiation and Nuclear Safety Authority, Finland, EURAMET 
VNIIM 
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET 
VSL 
VSL, Netherlands, EURAMET 
This page proposes printout 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)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 Co60 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 D_{i} and U_{i}, its expanded uncertainty (k = 2), with U_{i}_{ }= 2u_{i}.
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:
D_{ij }= D_{i}  D_{j}_{ }and U_{ij} , its expanded uncertainty (k = 2). The approximation for U_{ij} is explained in section 5 of the Final Report.
Linking COOMET.RI(I)K1 to BIPM.RI(I)K1
The relative value x_{i}_{ }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: D_{i} = (x_{i}  1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
See COOMET.RI(I)K1 Final Report for the approximation used for U_{i} 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:
D_{ij} = D_{i}  D_{j} and U_{ij}, its expanded uncertainty (k = 2). The approximation for U_{ij} is given in COOMET.RI(I)K1 Final Report.
Linking EUROMET.RI(I)K1 to BIPM.RI(I)K1
The relative value x_{i}_{ }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, ENEAINMRI, LNELNHB, 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: D_{i} = (x_{i}  1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
See EUROMET.RI(I)K1 Final Report for the approximation used for U_{i} 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:
D_{ij} = D_{i}  D_{j} and U_{ij}, its expanded uncertainty (k = 2). The approximation for U_{ij} is given in EUROMET.RI(I)K1 Final Report.
Linking APMP.RI(I)K1 to BIPM.RI(I)K1
The relative value x_{i}_{ }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 NMIJAIST (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: D_{i} = (x_{i}  1) x 1000 and U_{i}, 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:
D_{ij} = D_{i}  D_{j} and U_{ij}, its expanded uncertainty (k = 2). The approximation for U_{ij} is given in APMP.RI(I)K1 Final Report.
Linking APMP.RI(I)K1.1 to BIPM.RI(I)K1
The relative value x_{i}_{ }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 NMIJAIST (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: D_{i} = (x_{i}  1) x 1000 and U_{i}, 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:
D_{ij} = D_{i}  D_{j} and U_{ij}, its expanded uncertainty (k = 2). The approximation for U_{ij} is given in APMP.RI(I)K1.1 Final Report.
Linking EURAMET.RI(I)K1.2 to BIPM.RI(I)K1
The relative value x_{i}_{ }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: D_{i} = (x_{i}  1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
Linking EURAMET.RI(I)K1.1 to BIPM.RI(I)K1
The relative value x_{i}_{ }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, LNELNHB 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: D_{i} = (x_{i}  1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
Following decision of the CCRI in 2011, the pairwise 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.
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 Co60 beam
BIPM.RI(I)K1  Laboratory measurements
x_{i} : air kerma determined by Lab i at the BIPM, relative to the reference value determined by the BIPM standard
u_{i} : combined standard uncertainty of x_{i}
_{}
COOMET.RI(I)K1  Laboratory measurements
x_{i} : 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)
u_{i} : combined standard uncertainty of x_{i}
_{}
EUROMET.RI(I)K1  Laboratory measurements
MEASURAND : Air kerma
x_{i} : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through the ARPANSA, BEV, ENEAINMRI, LNELNHB, MKEH, NRC and VSL measurements at the BIPM.
u_{i} : combined standard uncertainty of x_{i}
_{}
APMP.RI(I)K1  Laboratory measurements
x_{i} : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through ARPANSA and NMIJ AIST measurements at the BIPM
u_{i} : combined standard uncertainty of x_{i}
_{}
APMP.RI(I)K1 measurements were carried out between August 2004 and May 2006
APMP.RI(I)K1.1  Laboratory measurements
x_{i} : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through ARPANSA and NMIJ AIST measurements at the BIPM
u_{i} : combined standard uncertainty of x_{i}
_{}
EURAMET.RI(I)K1.2  Laboratory measurements
x_{i} : air kerma detrmined by Lab i , relative to the reference value determined by the BIPM standard through BEV measurements at the BIPM
u_{i} : combined standard uncertainty of x_{i}
EURAMET.RI(I)K1.1  Laboratory measurements
See Section 4 of the EURAMET.RI(I)K1.1 Final Report.