BIPM.RI(I)-K1, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.3
MEASURAND Air kerma
Radiation quality Co-60 beam
Degrees of equivalence represented by Di = (xI - 1) and its expanded uncertainty Ui 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, COOMET.RI(I)-K1 and EUROMET.RI(I)-K1 are no longer 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, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.3
MEASURAND Air kerma
Radiation quality Co-60 beam
Degrees of equivalence represented by Di = (xI - 1) 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 | ||
| 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 | ||
| 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 | ||
| SSM | 0.0 | 5.7 | ||
| DSA | -0.1 | 6.2 | ||
| STUK | 0.5 | 6.0 | ||
| DTU | 0.6 | 6.9 | ||
| CIEMAT | 0.8 | 7.3 | ||
| IAEA | -0.1 | 7.1 |
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, COOMET.RI(I)-K1 and EUROMET.RI(I)-K1 are no longer 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 | 2013 - 2014 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Air kerma rate in mGy/nC |
| Parameters | Radiation type: Co-60 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 | EURAMET Project no 1285 |
| Comments | Results published on 30 July 2020 |
| Pilot institute |
METAS
Federal Institute of Metrology Switzerland |
| Contact person | Christian KOTTLER +41583870572 |
| Pilot laboratory | |
|---|---|
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| SCK.CEN/LNK |
Nuclear Calibration Laboratory, Belgian Nuclear Research Centre, Belgium, EURAMET |
| VSL |
VSL, Netherlands, EURAMET |
This page proposes print-out 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, APMP.RI(I)-K1.1, EURAMET.RI(I)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.3
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 = (xi -1) x 1000 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 Reports (available from the "Participant" tab).
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)-K1.1 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) (See section 4.4 of the EURAMET.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) (See section 6 of the EURAMET.RI(I)-K1.2 Final Report).
Linking EURAMET.RI(I)-K1.3 to BIPM.RI(I)-K1
VSL provides the link between the key comparison BIPM.RI(I)-K1 and EURAMET.RI(I)-K1.3, having participated in both comparisons. The linking process is described in Section 2.6 of the EURAMET.RI(I)-K1.3 Final Report.
The degree of equivalence of each laboratory i participant in EURAMET.RI(I)-K1.3 with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy: Di and Ui, its expanded uncertainty (k = 2) (See section 3.3 of the EURAMET.RI(I)-K1.3 Final Report).
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)-K1.1, EURAMET.RI(I)-K1.2 and EURAMET.RI(I)-K1.3
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
| Labi | xi | ui | 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
See EUROMET.RI(I)-K1 Final Report.
APMP.RI(I)-K1.1 - Laboratory measurements
xi : 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
ui : combined standard uncertainty of xi
| Labi | xi | ui | 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
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
| Labi | xi | ui | year of measurement | |
| VINS | 1.0024 | 0.0051 | 2017 |
EURAMET.RI(I)-K1.3 - Laboratory measurements
The measurement results are listed in Table 4 of the EURAMET.RI(I)-K1.3 Final Report.
