BIPM.RI(II)-K1.Co-58 and APMP.RI(II)-K2.Co-58
MEASURAND : Equivalent activity of 58Co
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq
-k1.co-58_graph.gif)
Red diamonds and black square: participants in BIPM.RI(II)-K1.Co-58 (the black square identifies the participant result prior to 1983)
Blue circles: participants in APMP.RI(II)-K2.Co-58 only
The APMP.RI(II)-K2.Co-58 results were reported in year 2000.
BIPM.RI(II)-K1.Co-58 and APMP.RI(II)-K2.Co-58
MEASURAND : Equivalent activity of 58Co
| Lab i | Di | Ui |
| / MBq | / MBq | |
| CMI-IIR | -0.14 | 0.21 |
| OMH | -0.05 | 0.11 |
| NPL | 0.01 | 0.21 |
| BNM-LNHB | 0.14 | 0.08 |
| PTB | 0.02 | 0.11 |
| NMIJ | 0.03 | 0.13 |
| BARC | 0.29 | 0.34 |
| CNEA | 0.13 | 0.31 |
| INER | 0.09 | 0.29 |
| KRISS | 0.07 | 0.10 |
| LNMRI | 0.50 | 0.25 |
| NIM | -0.04 | 0.20 |
In blue: participants in APMP.RI(II)-K2.Co-58 only
The full matrix of equivalence is available in Summary Results (summary of the results of both comparisons as a .PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Co-58 |
| 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 APMP.RI(II)-K2.Co-58 results are linked to those of BIPM.RI(II)-K1.Co-58 BIPM.RI(II)-K1.Co-58 and APMP.RI(II)-K2.Co-58 results were published on 04 March 2003. SIR equivalent activity of the radionuclide 58Co |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Carine Michotte +33 (0) 1 45 07 70 85 |
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" :
BIPM.RI(II)-K1.Co-58 and APMP.RI(II)-K2.Co-58
MEASURAND : Equivalent activity of 58Co
|
Key comparison reference value: |
| 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 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 in for the computation of the pair-wise degrees of equivalence. |
|
The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.Co-58 having been normalized to the value of the NMIJ as the linking laboratory. |
| The degree of equivalence of laboratory i participant in APMP.RI(II)-K2.Co-58 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 as none of these laboratories contributed to the computation of the key comparison reference value xR. |
| The degree of equivalence between two laboratories i and j, one participant in BIPM.RI(II)-K1.Co-58 and one in APMP.RI(II)-K2.Co-58, or both participants in APMP.RI(II)-K2.Co-58, 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 l being the linking laboratory when each laboratory is from APMP and f is the correlation coefficient. |
| These statements make it possible to extend the BIPM.RI(II)-K1.Co-58 Matrix of equivalence to all participants in APMP.RI(II)-K2.Co-58. |
BIPM.RI(II)-K1.Co-58 and APMP.RI(II)-K2.Co-58
MEASURAND : Equivalent activity of 58Co
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
CMI-IIR
16108
123
80-01-07
OMH
16197
51
86-06-30
NPL
16257
119
91-06-20
BNM-LNHB
16393
25
92-04-21
PTB
16266
51
95-05-09
NMIJ
16281
69
00-03-14
xi : result of measurement carried out by laboratory i converted to the equivalent activity through the NMIJ
ui : combined standard uncertainty of xi
* not all laboratories were eligible to be linked to the corresponding BIPM key comparison (see Final Report)
Lab i*
xi
/ kBqui
/ kBqMeasurement
report date
NMIJ
16281
69
00-04-24
BARC
16544
166
00-07-21
CNEA
16378
148
00-07-09
INER
16342
139
00-06-26
KRISS
16325
34
00-07-19
LNMRI
16749
119
00-07-04
NIM
16208
91
00-06-23
