MEASURAND : SIR equivalent activity of 141Ce
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq
-k1.ce-141_graph.gif)
Black squares: participants' results prior to 1983
MEASURAND : SIR equivalent activity of 141Ce
| Lab i | Di | Ui |
| / MBq | / MBq | |
| ANSTO | 0.19 | 1.57 |
| CMI-IIR | -1.81 | 3.16 |
| PTB | 1.58 | 2.81 |
| BNM-LNHB | -0.07 | 1.28 |
| NIST | 0.11 | 1.97 |
The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Ce-141 |
| Time of measurements | 1979 - |
| 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 published on 14 November 2002 SIR equivalent activity of the radionuclide 141Ce: |
| 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 |
| 1979 |
| BNM-LNHB |
Bureau National de Métrologie - Laboratoire National Henri Becquerel, France, EURAMET |
| 1992 |
| CMI-IIR |
Czech Metrology Institute - Inspectorate for Ionizing Radiation, Czechia, EURAMET |
| 1979 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1999 |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 1992 |
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MEASURAND : SIR equivalent activity of 141Ce
| Key comparison reference value: The SIR reference value for this radionuclide is xR = 266.00 MBq, with a standard uncertainty uR = 0.54 MBq. xR is computed from the mean of the participant results. |
| The degree of equivalence of each laboratory 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,  , see Appendix 2 of the Final Report. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in MBq. The approximation Uij ~ 2(ui2 + uj2)1/2 is used for the computation of the pair-wise degrees of equivalence. |
MEASURAND : SIR equivalent activity of 141Ce
xi : result of measurement carried out in the SIR for the sample submitted by laboratory i
ui : combined standard uncertainty of xi
| Lab i | xi / kBq |
ui / kBq |
Date of measurement |
| ANSTO | 266200 | 700 | 79-05-16 |
| CMI-IIR | 264200 | 1900 | 79-07-06 |
| PTB | 267589 | 1659 | 92-04-02 |
| BNM-LNHB | 265941 | 382 | 92-07-08 |
| NIST | 266115 | 1036 | 99-05-04 |
