BIPM.RI(II)-K1.Ho-166m, APMP.RI(II)-K2.Ho-166m and EURAMET.RI(II)-K2.Ho-166m
MEASURAND Equivalent activity of 166mHo
Degrees of equivalence relative to the key comparison reference value: Di and Ui, expressed in MBq
-K1.Ho-166m-G.PNG)
BIPM.RI(II)-K1.Ho-166m, APMP.RI(II)-K2.Ho-166m and EURAMET.RI(II)-K2.Ho-166m
MEASURAND Equivalent activity of 166mHo
Degrees of equivalence relative to the key comparison reference value: Di and Ui, expressed in MBq
-K1.Ho-166m-DoE.PNG)
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Activity of radionuclide Ho-166m |
| Time of measurements | 2024 |
| Status | Planned |
| Measurand | Activity of Ho-166m per unit mass |
| Transfer device | Ampoules of Holmium chloride |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Comments | Ho-166m is long-lived isotope useful for various instrument calibration. The solution provided by IRA is free of gamma emitting impurities, and can be used for both activity determination and half-life measurement. Participants will be provided with ampoules of Holmium chloride of about 1 MBq. |
| Pilot institute |
IRA
Institut Universitaire de Radiophysique Appliquée Switzerland |
| Contact person | Frederic Juget +41 21 31 48 162 |
| Additional |
| Pilot laboratory | |
|---|---|
| IRA |
Institut Universitaire de Radiophysique Appliquée, Switzerland, EURAMET |
| ANSTO |
Australian Nuclear Science and Technology Organisation, Australia, APMP |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| 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 |
| ININ |
Instituto Nacional de Investigaciones Nucleares, Mexico, SIM |
| JRC |
Joint Research Centre, European Union, 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 |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| NRC |
National Research Council, Canada, SIM |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| TENMAK-NUKEN |
Nuclear Energy Research Institute, Türkiye, EURAMET |
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BIPM.RI(II)-K1.Ho-166m, APMP.RI(II)-K2.Ho-166m and EURAMET.RI(II)-K2.Ho-166m
MEASURAND Equivalent activity of 166mHo
Key comparison reference value xR is the SIR reference value for this radionuclide where xR = 9.959 MBq, with a standard uncertainty uR = 0.022 MBq (see section 4.1 of the Final Report). xi is the equivalent activity for 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 MBq. With n the number of laboratories, Ui = 2[ (1 - 2wi )ui2 + uR2 ]1/2 when each laboratory has contributed to the calculation of xR.
The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.Ho-166m or EURAMET.RI(II)-K2.Ho-166m, having been normalized to the value of the NMIJ for APMP, or the PTB for EURAMET, as the linking laboratory.
The degree of equivalence of laboratory i participant in the APMP or EURAMET key comparison 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 as none of these laboratories contributed to the computation of the key comparison reference value xR.
These statements make it possible to extend the BIPM.RI(II)-K1.Ho-166m table of equivalence to participants in APMP.RI(II)-K2.Ho-166m and EURAMET.RI(II)-K2.Ho-166m.
BIPM.RI(II)-K1.Ho-166m, APMP.RI(II)-K2.Ho-166m and EURAMET.RI(II)-K2.Ho-166m
MEASURAND Equivalent activity of 166mHo
xi : result of measurement carried out in the SIR for the sample submitted by laboratory i
ui : combined standard uncertainty of xi
-K1.Ho-166m-LIM.PNG)
xi : result of measurement carried out by laboratory i converted to the equivalent activity through the NMIJ
ui : combined standard uncertainty of xi
-K2.Ho-166m-LIM.PNG)
xi : result of measurement carried out by laboratory i converted to the equivalent activity through the PTB
ui : combined standard uncertainty of xi
-K2.Ho-166m-LIM.PNG)
