MEASURAND SIR equivalent activity of Ac-225
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui (k =2), both expressed in kBq.
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui (k =2), both expressed in kBq/MBq.
MEASURAND SIR equivalent activity of Ac-225
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui (k =2), both expressed in kBq.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
kBq |
kBq |
kBq |
||
| PTB | -280 | 560 | ||
| POLATOM | 280 | 560 |
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui (k =2), both expressed in kBq/MBq.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
kBq/MBq |
kBq/MBq |
kBq/MBq |
||
| PTB | -3.7 | 7.5 | ||
| POLATOM | 3.8 | 7.5 |
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Ac-225 |
| Time of measurements | 2019 - |
| Status | Continuous |
| 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 and most recent results published on 15 December 2022. The status for not yet completed comparisons is indicated in "Participants". |
| 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 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| 2023 |
Report in progress, draft A |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
| 2021 |
|
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| 2019 |
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MEASURAND SIR equivalent activity of Ac-225
The SIR reference value for this radionuclide is xR = 74 800 kBq, with a standard uncertainty uR = 280 kBq.
xR is calculated by using the power-moderated weighted mean of the SIR results (see Section 4.1 of the Final Report). The value xi is taken as the equivalent activity for a laboratory i.
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 kBq, 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.
MEASURAND SIR equivalent activity of Ac-225
xi equivalent activity measured by the SIR for a laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| PTB | 74520 | 200 | 2019-06-21 | |
| POLATOM | 75080 | 210 | 2021-07-06 |
