BIPM.RI(I)-K8 and APMP.RI(I)-K8
MEASURAND Air kerma
SOURCE HDR Ir-192 brachytherapy sources
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.
Note:
(a) results obtained using a thimble-type chamber
(b) results obtained using a well-type chamber
BIPM.RI(I)-K8 and APMP.RI(I)-K8
MEASURAND Air kerma
SOURCE HDR Ir-192 brachytherapy sources
Degrees of equivalence represented by Di = (xI - 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 |
||
| NRC (a) | 0.9 | 10.0 | ||
| NMIJ (b) | 4.0 | 10.8 | ||
| VSL (a) | -7.4 | 11.0 | ||
| NPL (b) | 4.5 | 8.6 | ||
| PTB (b) | 2.2 | 20.2 | ||
| LNE-LNHB (b) | -1.0 | 14.2 | ||
| NIM (b) | 2.7 | 9.0 | ||
| IAEA | 9.4 | 30.4 | ||
| INER | 10.1 | 19.6 | ||
| KRISS | 4.2 | 16.4 | ||
| NMISA | 7.3 | 30.4 | ||
| Nuclear Malaysia | -6.4 | 30.8 | ||
| PTKMR-BATAN | 40.8 | 34.4 |
Note:
(a) results obtained using a thimble-type chamber
(b) results obtained using a well-type chamber
| Metrology area, Sub-field | Ionizing Radiation, Section I (x and gamma rays, electrons) |
| Description | Measurement of reference air kerma rate for HDR Ir-192 brachytherapy sources |
| Time of measurements | 2009 - |
| Status | Continuous, approved for equivalence |
| References |
BIPM.RI(I)-K8 Technical protocol International framework of traceability for radiation dosimetry quantities |
| Measurand | Reference air kerma rate (in mGy/h) relative to the BIPM evaluation |
| Parameters | Radiation type: HDR Ir-192 sealed brachytherapy sources |
| Transfer device | BIPM ionization chambers: well-type and thimble-type |
| 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 of results made on 03 April 2025 Results older than 15 years are no longer considered valid |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | C. Kessler +33 (0) 1 45 07 70 84 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2024 |
| NIM |
National Institute of Metrology, China, APMP |
| 2024 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 2015 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 2010 | |
| 2022 |
| NRC |
National Research Council, Canada, SIM |
| 2014 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 2011 | |
| 2023 |
| VSL |
VSL, Netherlands, EURAMET |
| 2009 | |
| 2019 |
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)-K8 and APMP.RI(I)-K8
MEASURAND Air kerma
SOURCE HDR Ir-192 brachytherapy sources
The key comparison reference value is the BIPM evaluation of reference air kerma rate.
The degree of equivalence of each laboratory i with respect to the key comparison refernce value is given by a pair of terms both expressed in mGy/Gy: the relative difference Di and Ui = 2 ui, its expanded uncertainty (k = 2).
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).
Linking APMP.RI(I)-K8 to BIPM.RI(I)-K8
The NRC and NMIJ provide the link between the key comparison APMP.RI(I)-K8 to BIPM.RI(I)-K8, having participated in both comparisons. The linking process is described in Section 2.6 of the APMP.RI(I)-K8 Final report.
BIPM.RI(I)-K8 and APMP.RI(I)-K8
MEASURAND Air kerma
SOURCE HDR Ir-192 brachytherapy sources
xi measurement result obtained by laboratory i relative to the KCRV
ui combined standard uncertainty of xi
BIPM.RI(I)-K8
| Labi | xi | ui | year of measurement | |
| NRC | 1.0009 | 0.0050 | 2014 | |
| NMIJ | 1.0040 | 0.0054 | 2015 | |
| VSL | 0.9926 | 0.0055 | 2019 | |
| NPL | 1.0045 | 0.0043 | 2022 | |
| PTB | 1.0022 | 0.0101 | 2023 | |
| LNE-LNHB | 0.9990 | 0.0071 | 2024 | |
| NIM | 1.0027 | 0.0045 | 2024 |
APMP.RI(I)-K8
| Labi | xi | ui | year of measurement | |
| IAEA | 1.0094 | 0.0152 | 2018 | |
| INER | 1.0101 | 0.0098 | 2018 | |
| KRISS | 1.0042 | 0.0082 | 2018 | |
| NMISA | 1.0073 | 0.0152 | 2018 | |
| Nuclear Malaysia | 0.9936 | 0.0154 | 2018 | |
| PTKMR-BATAN | 1.0408 | 0.0172 | 2017 |
