BIPM.RI(II)-K1.Cr-51, APMP.RI(II)-K2.Cr-51 and EURAMET.RI(II)-K2.Cr-51
MEASURAND : Equivalent activity of Cr-51
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in MBq.
Results in absolute values
Degrees of equivalence represented by Di = (xI - xR)/xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.
Results in relative values
BIPM.RI(II)-K1.Cr-51, APMP.RI(II)-K2.Cr-51 and EURAMET.RI(II)-K2.Cr-51
MEASURAND : Equivalent activity of Cr-51
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 |
||
| NMIJ | -0.9 | 3.1 | ||
| NPL | -1.0 | 6.7 | ||
| KRISS | 0.4 | 4.7 | ||
| POLATOM | -4.4 | 5.9 | ||
| VNIIM | 0.8 | 2.5 | ||
| LNE-LNHB | -1.6 | 3.2 |
Results in absolute values
Degrees of equivalence represented by Di = (xI - xR)/xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
kBq/MBq |
kBq/MBq |
kBq/MBq |
||
| NMIJ | -1.9 | 6.3 | ||
| NPL | -2 | 14 | ||
| KRISS | 0.7 | 9.7 | ||
| POLATOM | -9 | 12 | ||
| VNIIM | 1.6 | 5.1 | ||
| LNE-LNHB | -3.2 | 6.6 |
Results in relative values
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Cr-51 |
| Time of measurements | 1977 - |
| 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 First results published on 7 March 2003 Most recent results published on 16 February 2024 SIR equivalent activity of the radionuclide 51Cr: |
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Carine Michotte +33 (0) 1 45 07 70 85 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| 1994 |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| 2012 |
Report in progress, Draft B |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| 2006 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 1999 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| 2004 |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| 2004 |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
| 2022 |
report in progress draft B |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 1998 |
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BIPM.RI(II)-K1.Cr-51, APMP.RI(II)-K2.Cr-51 and EURAMET.RI(II)-K2.Cr-51
MEASURAND : Equivalent activity of Cr-51
BIPM.RI(II)-K1.Cr-51
Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is xR = 488.05 MBq with a standard uncertainty uR = 0.41 MBq
(see Section 4.1 of the BIPM.RI(II)-K1.I-Cr-51 Final Report). The value xi is taken as the equivalent activity for a laboratory i.
The degree of equivalence of each laboratory i 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, and
Ui = 2((1 - 2wi)ui2 + u2R)1/2, where wi is the weight of laboratory i contributing to the calculation of xR.
The degrees of equivalence are also given in relative terms by Di = (xI - xR) /xR and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq/MBq.
Linking APMP.RI(II)-K2.Cr-51 to BIPM.RI(II)-K1.Cr-51
The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.Cr-51 having been normalized using the value of the NMIJ as the linking laboratory.
The degree of equivalence of laboratory i participant in APMP.RI(II)-K2.Cr-51 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. The approximation Ui = 2(ui2 + uR2)1/2 is used in the following table as none of these Di contributed to the key comparison reference value.
Linking EURAMET.RI(II)-K2.Cr-51 to BIPM.RI(II)-K1.Cr-51
The value xi is the equivalent activity for laboratory i participant in EURAMET.RI(II)-K2.Cr-51 having been normalized to the value of the POLATOM as the linking laboratory.
The degree of equivalence of laboratory i participant in EURAMET.RI(II)-K2.Cr-511 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. The approximation Ui = 2(ui2 + uR2)1/2 is used in the following table as none of these Di contributed to the key comparison reference value..
These statements make it possible to extend the BIPM.RI(II)-K1.Cr-51 matrices of equivalence to all participants in the APMP.RI(II)-K2.Cr-51 and EURAMET.RI(II)-K2.Cr-51 comparisons
BIPM.RI(II)-K1.Cr-51, APMP.RI(II)-K2.Cr-51 and EURAMET.RI(II)-K2.Cr-51
MEASURAND : Equivalent activity of Cr-51
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.Cr-51
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| NMIJ | 487.1 | 1.6 | 2004-03-15 | |
| NPL | 487.0 | 3.4 | 2004-05-28 | |
| KRISS | 488.4 | 2.4 | 2012-01-27 | |
| POLATOM | 483.6 | 3.0 | 2022-06-03 |
APMP.RI(II)-K2.Cr-51
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| VNIIM | 488.8 | 1.2 | 2004 |
EURAMET.RI(II)-K2.Cr-51
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| LNE-LNHB | 486.5 | 1.6 | 2022 |
