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 | 2000 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Activity |
| Transfer device | Radioactive solution |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | APMP (Asia Pacific Metrology Programme) |
| Comments | Results of this key comparison are older than 20 years and were thus deleted from the KCDB in June 2024 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 25 June 2024. |
| Pilot institute |
NMIJ AIST
National Metrology Institute of Japan Japan |
| Contact person | Y. Hino +81 298 61 5667 |
| Pilot laboratory | |
|---|---|
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| CNEA |
National Commission of Atomic Energy, Argentina, SIM |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNMRI |
Laboratorio Nacional de Metrologia das Radiaçoes Ionizantes, IRD, Brazil, SIM |
| NIM |
National Institute of Metrology, China, APMP |
| NML-SIRIM |
National Metrology Laboratory, SIRIM Berhad (became NMIM), Malaysia, APMP |
| NRSL/INER |
Institute of Nuclear Energy Research, Chinese Taipei, APMP |
| OAP |
Office of Atoms for Peace, Thailand, APMP |
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
