BIPM.RI(II)-K1.Am-241 and 2006 COOMET.RI(II)-K2.Am-241
MEASURAND SIR equivalent activity of 241Am
Degrees of equivalence represented by Di = (xI - xR ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
Results in absolute values
BIPM.RI(II)-K1.Am-241 and 2006 COOMET.RI(II)-K2.Am-241
MEASURAND SIR equivalent activity of 241Am
Degrees of equivalence represented by Di = (xI - xR ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
MBq |
MBq |
MBq |
||
| VNIIM | -3 | 14 | ||
| POLATOM | 4 | 25 | ||
| MKEH | -18 | 11 | ||
| LNE-LNHB | -13 | 13 | ||
| BelGIM | 4 | 48 | ||
| CENTIS-DMR | -13 | 27 |
Results in absolute values
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Am-241 |
| Time of measurements | 1977 - |
| Status | Continuous, approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | SIR equivalent activity |
| Transfer device | Radioactive solution |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | BIPM (Bureau International des Poids et Mesures) |
| Comments | SIR: Système International de Référence, International Reference System Results last updated on 04 July 2024 Earlier reports and the status of not yet completed resulsts can be found in the participants list. Results older than 20 years are no longer considered valid (see pages 37 and 38 of the CCRI Report of its 18th meeting in 2003). |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Carine Michotte +33 (0) 1 45 07 70 85 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| 1977 |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| 1979 |
comparison carried out with MKEH (Hungarian Trade Licensing Office) |
| 2009 |
comparison carried out with MKEH (Hungarian Trade Licensing Office) |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| 1979 |
comparison carried out with CMI-IIR (Czech Metrology Institute - Inspectorate for Ionizing Radiation) |
| CNEA |
National Commission of Atomic Energy, Argentina, SIM |
| 2011 |
Report in progress, Draft B |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2011 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 1980 | |
| 2002 |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
| 2009 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 1978 |
| PTKMR-BATAN |
Center for Technology of Radiation Safety and Metrology, National Nuclear Energy Agency, Indonesia, APMP |
| 1989 |
comparison carried out with P3KRBiN (Pusat Penelitian & Pengembangan Keselamatan Radiasi & Biomedika Nuklir) |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| 2006 |
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BIPM.RI(II)-K1.Am-241 and 2006 COOMET.RI(II)-K2.Am-241
MEASURAND SIR equivalent activity of 241Am
BIPM.RI(II)-K1.Am-241
Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is xR = 2055.8 MBq, with a standard uncertainty uR = 2.8 MBq
(see Section 4.1 of the BIPM.RI(II)-K1.Am-241 Final report dated November 2007).
The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms:
Di = (xi - xR) and Ui its expanded uncertainty (k = 2) both expressed in MBq. With n the number of laboratories,
Ui = 2[(1 - 2/n)ui2 + (1/n2)Σui2]1/2 when each laboratory has contributed to the calculation of xR.
Linking COOMET.RI(II)-K2.Am-241 to BIPM.RI(II)-K1.Am-241
The value xi is the equivalent activity for laboratory i participant in COOMET.RI(II)-K2.Am-241 having been normalized using the SIR measurement of the VNIIM solution of the COOMET.RI(II)-K2 comparison.
The degree of equivalence of laboratory i participant in COOMET.RI(II)-K2.Am-241 with respect to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) and Ui , its expanded uncertainty (k = 2), both expressed in MBq.
The approximation Ui = 2(ui2 + uR2)1/2 is used in the Matrix of equivalence as none of these laboratories contributed to the key comparison reference value.
These statements make it possible to extend the BIPM.RI(II)-K1.Am-241 graph of equivalence to all participants in the COOMET.RI(II)-K2.Am-241 comparison.
BIPM.RI(II)-K1.Am-241 and 2006 COOMET.RI(II)-K2.Am-241
MEASURAND SIR equivalent activity of 241Am
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.Am-24
| Labi | xi | ui | Date of measurement | |
| MBq | MBq | |||
| VNIIM | 2052.6 | 7.7 | 2006-08-03 | |
| POLATOM | 2060.0 | 12.0 | 2009-01-28 | |
| MKEH | 2038.0 | 4.3 | 2009-02-25 | |
| LNE-LNHB | 2042.7 | 5.8 | 2011-05-05 |
COOMET.RI(II)-K2.Am-241
| Labi | xi | ui | Date of measurement | |
| MBq | MBq | |||
| BelGIM | 2060 | 24 | 2006-06-01 | |
| CENTIS-DMR | 2043 | 13 | 2006-06-01 |
