BIPM.RI(II)-K1.Np-237
MEASURAND : Equivalent activity of 237Np
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
BIPM.RI(II)-K1.Np-237
MEASURAND : Equivalent activity of 237Np
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 |
||
| BIPM | 0.6 | 1.6 | ||
| PTB | -0.1 | 0.3 | ||
| IRMM | 0.1 | 0.3 |
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Np-237 |
| Time of measurements | 1998 - |
| 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 were published on 28 June 2007. SIR equivalent activity of the radionuclide 237Np |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Carine Michotte +33 (0) 1 45 07 70 85 |
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BIPM.RI(II)-K1.Np-237
MEASURAND : Equivalent activity of 237Np
Key comparison reference value: the SIR reference value for this radionuclide is xR = 74.85 MBq, with a standard uncertainty uR = 0.11 MBq (see section 4.1 of 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,
Ui = 2[(1 - 2n)ui 2 + (1/n 2) Σui 2)]1/2 when each laboratory has contributed to the computation of xR.
Where appropriate the degree of equivalence between two laboratories may be computed by a pair of terms, both expressed in MBq:
Dij =(Di - Dj) = (xi - xj) and Uij, its expanded uncertainty (k = 2) where the approximation Uij ~ 2(ui2 + uj2)1/2 is used.
BIPM.RI(II)-K1.Np-237
MEASURAND : Equivalent activity of 237Np
xi result of measurement carried out in the SIR for the sample submitted by laboratory i
ui combined standard uncertainty of xi
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| BIPM | 75 440 | 790 | 1998-06-12 | |
| PTB | 74 440 | 220 | 2006-02-02 | |
| IRMM | 79 950 | 180 | 2007-02-27 |
