BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68
MEASURAND : Equivalent activity of Ge-68
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.Ge-68 and CCRI(II)-K2.Ge-68
MEASURAND : Equivalent activity of Ge-68
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 |
||
| IRA | 0.02 | 0.16 | ||
| LNE-LNHB | 0.08 | 0.15 | ||
| TENMAK-NUKEN | 0.19 | 0.48 | ||
| NIM | -0.11 | 0.12 | ||
| ANSTO | -0.05 | 0.18 | ||
| BARC | -0.12 | 0.10 | ||
| CIEMAT | -0.09 | 0.13 | ||
| IFIN-HH | -0.22 | 0.31 | ||
| INER | -0.10 | 0.12 | ||
| KRISS | 0.19 | 0.21 | ||
| LNMRI-IRD | 0.00 | 0.18 | ||
| NMIJ | 0.05 | 0.23 | ||
| NPL | 0.09 | 0.23 | ||
| POLATOM | 0.09 | 0.21 | ||
| PTB | 0.11 | 0.27 | ||
| SMU | 1.71 | 0.15 |
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 |
||
| NIST | 4 | 12 | ||
| IRA | 2 | 10 | ||
| LNE-LNHB | 5 | 9 | ||
| TENMAK-NUKEN | 12 | 31 | ||
| NIM | -7.0 | 7.7 | ||
| ANSTO | -3 | 12 | ||
| BARC | -7.5 | 6.6 | ||
| CIEMAT | -5.8 | 8.1 | ||
| IFIN-HH | -14 | 19 | ||
| INER | -6.1 | 7.3 | ||
| KRISS | 12 | 13 | ||
| LNMRI-IRD | 0 | 11 | ||
| NMIJ | 3 | 14 | ||
| NPL | 5 | 14 | ||
| POLATOM | 5 | 13 | ||
| PTB | 7 | 17 | ||
| SMU | 109 | 10 |
Results in relative values
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity concentration of the same Ge-68 chloride solution |
| Time of measurements | 2014 - 2015 |
| Status | Approved |
| Final Reports of the comparisons | |
| References |
Uncertainty budget for the CCRI(II)-K2.Ge-68 comparison CCRI(II)-K2.Ge-68 Technical Protocol Results linked to BIPM.RI(II)-K1.Ge-68: Metrologia 2020 57 Tech. Suppl. 06014 |
| Measurand | Activity per unit mass, nominally 1 MBq/g |
| Transfer device | Nuclide solution of Ge-68 + Ga-68 chloride in carrier containing 0.5 mol/L HCl and approximately 45 µg/g of solution each nonactive Ge+4 and Ga+3 ions; approximately 5 g in a NIST-style 5 mL ampoule |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Comments | Linking results published on 6 August 2020. Most recent results published on 16 February 2024 |
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | Jeffrey T. Cessna +1 301 975 5539 |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| CIEMAT |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET |
| IFIN-HH |
"Horia Hulubei" National Institute of Research and Development for Physics and Nuclear Engineering, Romania, EURAMET |
| IRA |
Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNE-LNHB |
Commissariat à l'énergie atomique / Laboratoire National Henri Becquerel, France, EURAMET |
| LNMRI/IRD |
Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD, Brazil, SIM |
| NIM |
National Institute of Metrology, China, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| NRSL/INER |
Institute of Nuclear Energy Research, Chinese Taipei, APMP |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| TAEK |
Turkish Atomic Energy Authority, Türkiye, EURAMET |
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BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68
MEASURAND : Equivalent activity of Ge-68
BIPM.RI(II)-K1.Ge-68
Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is xR = 15773 kBq with a standard uncertainty uR = 30 kBq
(see Section 4.1 of the BIPM.RI(II)-K1.I-Ge-58 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 CCRI(II)-K2.Ge-68 to BIPM.RI(II)-K1.Ge-68
The value xi is the equivalent activity for laboratory i participant in CCRI(II)-K2.Ge-68 having been normalized using the value of the NMIJ as the linking laboratory.
The degree of equivalence of laboratory i participant in CCRI(II)-K2.Ge-68 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.Ge-68 matrix of equivalence to all participants in the CRI(II)-K2.Ge-68 comparison.
BIPM.RI(II)-K1.Ge-68 and CCRI(II)-K2.Ge-68
MEASURAND : Equivalent activity of Ge-68
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.Ge-68
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| NIST | 15 829 | 98 | 2014-12-15 | |
| IRA | 15 797 | 86 | 2015-04-22 | |
| LNE-LNHB | 15 855 | 81 | 2015-05-28 | |
| TENMAK-NÜKEN | 15 960 | 240 | 2018-01-04 | |
| NIM | 15 663 | 37 | 2021-05-10 |
CCRI(II)-K2.Ge-68
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| ANSTO | 15 725 | 86 | 2018 | |
| BARC | 15 655 | 42 | 2018 | |
| CIEMAT | 15 682 | 56 | 2018 | |
| IFIN-HH | 15 550 | 150 | 2018 | |
| INER | 15 677 | 49 | 2018 | |
| KRISS | 15 960 | 100 | 2018 | |
| LNMRI-IRD | 15 777 | 84 | 2018 | |
| NMIJ | 15 820 | 110 | 2018 | |
| NPL | 15 860 | 110 | 2018 | |
| POLATOM | 15 860 | 100 | 2018 | |
| PTB | 15 880 | 130 | 2018 | |
| SMU | 17 487 | 71 | 2018 |
