BIPM.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.1 and EURAMET.RI(I)-K1.2
MEASURAND Air kerma
Radiation quality Co-60 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.
Only the most recent degree of equivalence is retained for those laboratories which participated in two key comparisons.
Results generated from SIM.RI(I)-K1, APMP.RI(I)-K1 and COOMET.RI(I)-K1 are no longher listed here as they are older than 15 years. Nevertheless, these results can be consulted via the left margin of the "Information" tab.
BIPM.RI(I)-K1, EUROMET.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.1 and EURAMET.RI(I)-K1.2
MEASURAND Air kerma
Radiation quality Co-60 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 | ||
NIST | 3.9 | 6.8 | ||
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 | ||
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 | ||
BFKH | 2.9 | 4.4 | ||
NMIJ | 1.3 | 4.4 | ||
KRISS | 0.6 | 3.6 | ||
LNMRI | 2.4 | 13.7 | ||
CNEA | 1.8 | 10.0 | ||
INER | 0.5 | 6.9 | ||
DMSC | -4.5 | 7.8 | ||
NIS | -12.1 | 14.6 | ||
METAS | 0.1 | 10.5 | ||
CIEMAT | 0.6 | 7.6 | ||
VINS | 2.4 | 10.2 |
Only the most recent degree of equivalence is retained for those laboratories which participated in two key comparisons.
Results generated from SIM.RI(I)-K1, APMP.RI(I)-K1 and COOMET.RI(I)-K1 are no longher listed here as they are older than 15 years. Nevertheless, these results can be consulted via the left margin of the "Information" tab.
Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
Description | MEASUREMENT OF AIR KERMA FOR COBALT 60 |
Time of measurements | 2021 - 2022 |
Status | Approved for equivalence |
Final Reports of the comparisons | |
References | |
Measurand | Air kerma |
Transfer device | ionization chamber |
Comparison type | Key Comparison |
Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
Conducted by | EURAMET (European Association of National Metrology Institutes) |
RMO Internal Identifier | EURAMET 1541 |
Comments | Carried out simultaneously with comparison of absorbed dose to water in Co-60 radiation beam for radiation therapy |
Pilot institute |
STUK
Radiation and Nuclear Safety Authority Finland |
Contact person | Reetta Nylund +358401520941 |
Additional |
Pilot laboratory | |
---|---|
STUK |
Radiation and Nuclear Safety Authority, Finland, EURAMET |
CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
DSA |
Norwegian Radiation and Nuclear Safety Authority, Norway, EURAMET |
DTU |
Technical University of Denmark, Denmark, EURAMET |
IAEA |
International Atomic Energy Agency, IAEA - International Organization, SIM |
SSM |
Swedish Radiation Safety Authority, Sweden, EURAMET |
VSL |
VSL, Netherlands, EURAMET |
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BIPM.RI(I)-K1, SIM.RI(I)-K1, APMP.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.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 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 Reports (available from the "Participant" tab).
Linking SIM.RI(I)-K1 to BIPM.RI(I)-K1
The relative value x_{i}_{ }is the comparison result for laboratory i participant in SIM.RI(I)-K1 and is linked to the BIPM.RI(I)-K1 via NIST and NRC (see SIM.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 SIM.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 SIM.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 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: 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 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, 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: 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)-K1.1 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 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: 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, 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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
BIPM.RI(I)-K1, SIM.RI(I)-K1, APMP.RI(I)-K1, COOMET.RI(I)-K1, EUROMET.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
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}
Lab_{i} | x_{i} | u_{i} | year of measurement | |
VNIIM | 1.0008 | 0.0018 | 2009 | |
NIST | 1.0039 | 0.0034 | 2011 | |
ININ | 1.0035 | 0.0021 | 2012 | |
LNE-LNHB | 0.9994 | 0.0018 | 2013 | |
PTB | 1.0036 | 0.0017 | 2014 | |
ENEA-INMRI | 0.9999 | 0.0022 | 2015 | |
NIM | 0.9997 | 0.0027 | 2015 | |
IST/ITN | 1.0026 | 0.0017 | 2015 | |
SCK-CEN | 1.0021 | 0.0026 | 2016 | |
SMU | 1.0042 | 0.0027 | 2017 | |
NPL | 0.9996 | 0.0030 | 2017 | |
VSL | 0.9963 | 0.0021 | 2017 | |
BEV | 1.0030 | 0.0025 | 2020 | |
GUM | 1.0039 | 0.0030 | 2020 | |
ARPANSA | 0.9986 | 0.0027 | 2020 | |
NRC | 1.0022 | 0.0022 | 2020 | |
BFKH | 1.0029 | 0.0022 | 2021 | |
NMIJ | 1.0013 | 0.0022 | 2022 | |
KRISS | 1.0006 | 0.0018 | 2022 |
SIM.RI(I)-K1 - Laboratory measurements
See SIM.RI(I)-K1 Final Report.
APMP.RI(I)-K1 - Laboratory measurements
See APMP.RI(I)-K1 Final Report.
COOMET.RI(I)-K1 - Laboratory measurements
See COOMET.RI(I)-K1 Final Report.
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, ENEA-INMRI, LNE-LNHB, MKEH, NRC and VSL measurements at the BIPM.
u_{i} : combined standard uncertainty of x_{i}
Lab_{i} | x_{i} | u_{i} | year of measurement | |
METAS | 0.9987 | 0.0023 | 2007 | |
NIST | 1.0034 | 0.0032 | 2007 | |
LNMRI | 1.0024 | 0.0069 | 2007 | |
CNEA | 1.0018 | 0.0050 | 2008 |
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}
Lab_{i} | x_{i} | u_{i} | year of measurement | |
INER | 1.0005 | 0.0034 | 2009 | |
DMSC | 0.9955 | 0.0044 | 2010 | |
NIS | 0.9879 | 0.0075 | 2010 |
EURAMET.RI(I)-K1.1 - Laboratory measurements
See Section 4 of the EURAMET.RI(I)-K1.1 Final Report.
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}
Lab_{i} | x_{i} | u_{i} | year of measurement | |
VINS | 1.0024 | 0.0051 | 2017 |