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, D_{i} and expanded uncertainty U_{i} (k = 2)
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, D_{i} and expanded uncertainty U_{i} (k = 2)
LAB_{i} | D_{i} | U_{neg,i} | U_{pos,i} | |
---|---|---|---|---|
mGy/Gy |
mGy/Gy |
mGy/Gy |
||
MKEH | -0.7 | 9.6 | ||
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 | ||
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 | ||
NIM | 1.0 | 10 | ||
PTKMR-BATAN | 2.3 | 19 | ||
NRSL/INER | -1.9 | 8.2 | ||
NIS | 0.3 | 14 |
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 | 2013 - 2014 |
Status | Approved for equivalence |
Final Reports of the comparisons | |
References | |
Measurand | Absorbed dose rate to water 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 | Published on 30 July 2020 |
Pilot institute |
METAS
Federal Institute of Metrology Switzerland |
Contact person | Christian KOTTLER |
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 |
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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 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 SIM.RI(I)-K4 to BIPM.RI(I)-K4
The relative value x_{i}_{ }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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, its expanded uncertainty (k = 2).
Linking EUROMET.RI(I)-K4 to BIPM.RI(I)-K4
The relative value x_{i}_{ }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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, 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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, 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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, 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: D_{i} = (x_{i} - 1) x 1000 and U_{i}, 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
x_{i} : ratio of the measurement made at the BIPM by laboratory i to that of the BIPM
u_{i} : combined standard uncertainty of the ratio x_{i}
SIM.RI(I)-K4 - Laboratory measurements
x_{i} : 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)
u_{i} : combined standard uncertainty of x_{i}
_{}
EUROMET.RI(I)-K4 - Laboratory measurements
x_{i} : 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.
u_{i} : combined standard uncertainty of x_{i}
EURAMET.RI(I)-K4.2 - Laboratory measurements
x_{i} : result of measurement carried out at laboratory i linked via BEV, LNE-LNHB and METAS.
u_{i} : combined standard uncertainty of x_{i}
_{}
EURAMET.RI(I)-K4.1 - Laboratory measurements
x_{i} : result of measurement carried out at laboratory i linked via BEV.
u_{i} : combined standard uncertainty of x_{i}
APMP.RI(I)-K4 - Laboratory measurements
x_{i} : result of measurement carried out at laboratory i linked via ARPANSA, NMIJ-AIST and PTB.
u_{i} : combined standard uncertainty of x_{i}
_{}