MEASURAND : SIR equivalent activity of 144Ce
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq
-k1.ce-144_g_feb06.gif)
Black squares: participant's results prior to 1985
Note: the right-hand axis shows approximate relative values only.
MEASURAND : SIR equivalent activity of 144Ce
| Lab i | Di | Ui |
| / MBq | / MBq | |
| CMI-IIR | 1.3 | 3.8 |
| NPL | -2.0 | 2.6 |
| LNE-LNHB | 0.9 | 2.2 |
| NIST | 2.1 | 2.4 |
| OMH | -1.0 | 2.9 |
Results are presented under A4 printable format in Summary Results (.PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Ce-144 |
| Time of measurements | 1978 - |
| 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 144Ce: |
| 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 |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 1988 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1990 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 1984 |
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" :
MEASURAND : SIR equivalent activity of 144Ce
| Key comparison reference value: The SIR reference value for this radionuclide is xR = 282.8 MBq, with a standard uncertainty uR = 0.7 MBq. xR is computed from the mean of the participant results including a result from Canada, see the Final Report. |
| 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,  when each laboratory has contributed to the computation of xR, see Metrologia, 42, 140-144. |
| 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 144Ce
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 |
| CMI-IIR | 284100 | 2200 | 78-06-20 |
| NPL | 280780 | 1430 | 84-06-21 |
| LNE-LNHB | 283760 | 1100 | 88-10-12 |
| NIST | 284940 | 1280 | 90-01-23 |
| OMH | 281850 | 1600 | 90-06-11 |
