EUROMET.RI(II)-K2.Np-237 was placed in the KCDB archives on 12 March 2024
BIPM.RI(II)-K1.Np-237 and EUROMET.RI(II)-K2.Np-237
MEASURAND : Equivalent activity of 237Np
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq
Red diamonds : participants in BIPM.RI(II)-K1.Np-237
Green triangles : participants in EUROMET.RI(II)-K2.Np-237
Note: the right-hand axis shows approximate relative values only.
EUROMET.RI(II)-K2.Np-237 was placed in the KCDB archives on 12 March 2024
BIPM.RI(II)-K1.Np-237 and EUROMET.RI(II)-K2.Np-237
MEASURAND : Equivalent activity of 237Np
| Lab i | Di | Ui |
| / MBq | / MBq | |
| BIPM | 0.6 | 1.6 |
| PTB | -0.1 | 0.3 |
| IRMM | 0.1 | 0.3 |
| LNE-LNHB | 0.4 | 0.5 |
| CIEMAT | 0.7 | 0.8 |
| NPL | -0.6 | 0.9 |
| NRC | -0.8 | 1.7 |
In green: participants in EUROMET.RI(II)-K2.Np-237
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 Np-237 |
| Time of measurements | 1997 - 2001 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Activity |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| RMO Internal Identifier | EUROMET Project No 416 |
| Comments | Results of this key comparison are older than 15 years and were thus placed in the KCDB Archives following the decision of the CCRI(II) at its 17th meeting in 2003 (see pages 37 and 38 of the CCRI Report of its 18th meeting in 2003) to gradually phase out old data to ensure that the KCDB maintains its currency. For the same reason, this comparison was placed in the KCDB archives on 12 March 2024. |
| Pilot institute |
NPL
National Physical Laboratory United Kingdom |
| Contact person | M.J. Woods +44 (0) 20 8943 6425 |
| Pilot laboratory | |
|---|---|
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| BNM-LNHB |
Bureau National de Métrologie - Laboratoire National Henri Becquerel, France, EURAMET |
| CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
| IRMM |
Institute for Reference Materials and Measurements, European Union, EURAMET |
| NRC |
National Research Council, Canada, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
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" :
EUROMET.RI(II)-K2.Np-237 was placed in the KCDB archives on 12 March 2024
BIPM.RI(II)-K1.Np-237 and EUROMET.RI(II)-K2.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,  when each laboratory has contributed to the computation of xR. |
| 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 in the Matrix of equivalence. |
|
The value xi is the equivalent activity for laboratory i participant in EUROMET.RI(II)-K2.Np-237 having been normalized using the SIR measurements of the BIPM, PTB, and the IRMM as linking laboratories. |
| The degree of equivalence of laboratory i participant in EUROMET.RI(II)-K2.Np-237 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. |
| The degree of equivalence between two laboratories i and j, one participant in BIPM.RI(II)-K1.Np-237 and one in EUROMET.RI(II)-K2.Np-237, or both participants in EUROMET.RI(II)-K2.Np-237, is given by a pair of terms expressed in MBq: Dij = Di - Dj and Uij, its expanded uncertainty (k = 2), approximated by Uij = 2(ui2 + uj2 - 2ful2)1/2 with ul being the standard uncertainty of the link when each laboratory is from EUROMET and f is the correlation coefficient. |
| These statements make it possible to extend the BIPM.RI(II)-K1.Np-237 matrix of equivalence to all participants in EUROMET.RI(II)-K2.Np-237. |
EUROMET.RI(II)-K2.Np-237 was placed in the KCDB archives on 12 March 2024
BIPM.RI(II)-K1.Np-237 and EUROMET.RI(II)-K2.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
| Lab i | xi / kBq |
ui / kBq |
Date of measurement |
| BIPM | 75440 | 790 | 12-06-1998 |
| PTB | 74740 | 220 | 02-02-2006 |
| IRMM | 74950 | 180 | 27-02-2007 |
xi : result of measurement carried out at laboratory i converted to the equivalent activity through the linking laboratories BIPM, PTB and the IRMM
ui : combined standard uncertainty of xi
| Lab i | xi / kBq |
ui / kBq |
Year of measurement |
| LNE-LNHB | 75210 | 230 | 1998 |
| CIEMAT | 75510 | 380 | 1999 |
| NPL | 74210 | 450 | 1998 |
| NRC | 74060 | 820 | 1998 |
