CCRI(II)-K2.Pa-231
MEASURAND Activity per unit mass of 231Pa solution
NOMINAL VALUE 35 kBq.g-1 to 45 kBq.g-1
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq.g-1.
CCRI(II)-K2.Pa-231
MEASURAND Activity per unit mass of 231Pa solution
NOMINAL VALUE 35 kBq.g-1 to 45 kBq.g-1
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in kBq.g-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
kBq.g-1 |
kBq.g-1 |
kBq.g-1 |
||
| JRC | 0.10 | 0.11 | ||
| LNE-LNHB | 0.01 | 0.25 | ||
| NIM | -0.16 | 0.23 | ||
| NRC | -0.28 | 0.59 | ||
| PTB | -0.05 | 0.19 | ||
| NPL | 0.02 | 0.21 |
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity measurement of Pa-231 in aqueous solution |
| Time of measurements | 2017 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Pa-231 activity concentration around 45 000 Bq/g |
| Parameters | Separation date defined as 2017-05-22 at 09:55 UTC; DDEP decay data. |
| Transfer device | Aliquots of the same Pa-231 solution were distributed to the participants and the BIPM (for linking to BIPM.RI(II)-K1.Pa-231) |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Pilot institute |
NPL
National Physical Laboratory United Kingdom |
| Contact person | Robert Shearman |
| Pilot laboratory | |
|---|---|
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| JRC |
Joint Research Centre, European Union, EURAMET |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NRC |
National Research Council, Canada, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
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CCRI(II)-K2.Pa-231
MEASURAND Activity per unit mass of 231Pa solution
NOMINAL VALUE 35 kBq.g-1 to 45 kBq.g-1
The key comparison reference value xR and its associated standard uncertainty uR are computed using the power-moderated mean, as described in Section 4.1 of the CCRI(II)-K2.Pa-231 Final report, with an additional uncertainty included in the calculation of xR.
xR = 41.461 kBq.g-1 uR = 0.048 kBq.g-1
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in kBq.g-1:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence determined according to Section 4 of the CCRI(II)-K2.Pa-231 Final report .
CCRI(II)-K2.Pa-231
MEASURAND Activity per unit mass of 231Pa solution
NOMINAL VALUE 35 kBq.g-1 to 45 kBq.g-1
xi measurement value submitted by institute i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| kBq.g-1 | kBq.g-1 | ||
| JRC | 41.56 | 0.05 | |
| LNE-LNHB | 41.47 | 0.13 | |
| NIM | 41.30 | 0.12 | |
| NPL | 41.48 | 0.11 | |
| NRC | 41.18 | 0.30 | |
| PTB | 41.41 | 0.10 |
