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.
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 | EUROMET.RI(II)-K2.Np-237 results are linked to those of BIPM.RI(II)-K1.Np-237 BIPM.RI(II)-K1.Np-237 and EUROMET.RI(II)-K2.Np-237 results were published on 28 June 2007. SIR equivalent activity of the radionuclide 237Np |
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 |
CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
NRC |
National Research Council, Canada, SIM |
PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
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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, ![]() |
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. |
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
/ kBqui
/ kBqDate 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
/ kBqui
/ kBqYear of measurement
LNE-LNHB
75210
230
1998
CIEMAT
75510
380
1999
NPL
74210
450
1998
NRC
74060
820
1998