BIPM.RI(II)-K1.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131 and EURAMET.RI(II)-K2.I-131
MEASURAND : Equivalent activity of I-131
Degrees of equivalence relative to the BIPM.RI(II)-K1.I-131 key comparison reference value
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
BIPM.RI(II)-K1.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6 and EURAMET.RI(II)-K2
MEASURAND : Equivalent activity of I-131
Degrees of equivalence relative to the BIPM.RI(II)-K1.I-131 key comparison reference value
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.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131 and EURAMET.RI(II)-K2.I-131
MEASURAND : Equivalent activity of I-131
Degrees of equivalence relative to the BIPM.RI(II)-K1.I-131 key comparison reference value
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 |
||
| CIEMAT | -0.22 | 0.37 | ||
| PTB | -0.01 | 0.15 | ||
| CMI | 0.00 | 0.23 | ||
| IFIN-HH | 0.04 | 0.27 | ||
| NMIJ | 0.06 | 0.19 | ||
| NIST | -0.03 | 0.27 | ||
| LNE-LNHB | -0.19 | 0.18 | ||
| BEV | 0.34 | 0.35 | ||
| POLATOM | -0.10 | 0.31 | ||
| NMISA | 0.18 | 0.31 | ||
| ANSTO | 0.08 | 0.45 | ||
| BARC | -0.30 | 0.39 | ||
| INER | 0.82 | 0.35 | ||
| KRISS | 0.93 | 0.21 | ||
| OAP | 0.5 | 1.3 | ||
| PTKMR | -0.5 | 1.8 | ||
| LNMRI/IRD | -0.2 | 1.1 | ||
| ENEA-INMRI | -0.08 | 0.35 |
Results in absolute values
BIPM.RI(II)-K1.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131 and EURAMET.RI(II)-K2.I-131
MEASURAND : Equivalent activity of I-131
Degrees of equivalence relative to the BIPM.RI(II)-K1.I-131 key comparison reference value
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 |
||
| CIEMAT | -5.5 | 9.3 | ||
| PTB | -0.3 | 3.7 | ||
| CMI | 0.0 | 5.8 | ||
| IFIN-HH | 1.0 | 6.8 | ||
| NMIJ | 1.5 | 4.8 | ||
| NIST | -0.8 | 6.8 | ||
| LNE-LNHB | -4.6 | 4.4 | ||
| BEV | 8.4 | 8.6 | ||
| POLATOM | -2.5 | 7.8 | ||
| NMISA | 4.4 | 7.8 | ||
| ANSTO | 2 | 11 | ||
| BARC | -7.5 | 10 | ||
| INER | 20 | 9 | ||
| KRISS | 23 | 5 | ||
| OAP | 14 | 32 | ||
| PTKMR | -12 | 45 | ||
| LNMRI/IRD | -5 | 27 | ||
| ENEA-INMRI | -2 | 8.6 |
Results in relative values
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | Bilateral Comparison in activity measurements of a I-131 solution |
| Time of measurements | 2015 |
| Status | Approved |
| Final Reports of the comparisons | |
| References | |
| Measurand | Activity of I-131 source, in Bq |
| Transfer device | Same set of three LS sources, measured in TDCR and 4πβ(LS)-γ coincidence systems, and one vial, SIR-type, measured in Ionization Chambers both at ENEA-INMRI and POLATOM. |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| Comments | TDCR, efficiency extrapolation in β(LS)-γ system, Ionization Current. The sources were prepared at POLATOM from a I-131 batch by gravimetric method. A vial for BIPM-SIR is also prepared by POLATOM from the same batch above. |
| Pilot institute |
ENEA-INMRI
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti Italy |
| Contact person | M. Capogni +39 06 3048 6628 |
| Pilot laboratory | |
|---|---|
| ENEA-INMRI |
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET |
| POLATOM |
Radioisotope Centre Polatom, Poland, EURAMET |
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BIPM.RI(II)-K1.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131 and EURAMET.RI(II)-K2.I-131
BIPM.RI(II)-K1.I-131
MEASURAND : Equivalent activity of I-131
Key comparison reference value: the SIR key comparison reference value xR for this radionuclide is xR = 40 371 kBq with a standard uncertainty uR = 34 kBq
(see Section 4.1 of the BIPM.RI(II)-K1.I-131Final 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.I-131 to BIPM.RI(II)-K1.I-131
The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.I-131 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.I-131 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 CCRI(II)-S6.I-131 to BIPM.RI(II)-K1.I-131
The value xi is the equivalent activity for laboratory i participant in CCRI(II)-S6.I-131 having been normalized using the value of the CMI as the linking laboratory.
The degree of equivalence of laboratory i participant in CCRI(II)-S6.I-131 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.I-131 to BIPM.RI(II)-K1.I-131
The value xi is the equivalent activity for laboratory i participant in EURAMET.RI(II)-K2.I-131 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.I-131 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.I-131 matrices of equivalence to all participants in the APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131, and EURAMET.RI(II)-K2.I-131 comparisons
BIPM.RI(II)-K1.I-131, APMP.RI(II)-K2.I-131, CCRI(II)-S6.I-131 and EURAMET.RI(II)-K2.I-131
MEASURAND : Equivalent activity of I-131
Degrees of equivalence relative to the BIPM.RI(II)-K1.I-131 key comparison reference value
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
BIPM.RI(II)-K1.I-131
| Labi | xi | ui | Date of measurement | |
| kBq | kBq | |||
| CIEMAT | 40 150 | 190 | 2002-06-26 | |
| PTB | 40 357 | 77 | 2004-04-30 | |
| CMI | 40 370 | 120 | 2006-08-22 | |
| IFIN-HH | 40 410 | 140 | 2008-01-03 | |
| NMIJ | 40 430 | 100 | 2009-03-09 | |
| NIST | 40 340 | 140 | 2012-03-28 | |
| LNE-LNHB | 40 184 | 92 | 2012-11-16 | |
| BEV | 40 710 | 170 | 2015-06-02 | |
| POLATOM | 40 270 | 160 | 2015-10-22 | |
| NMISA | 40 550 | 160 | 2017-09-13 |
APMP.RI(II)-K2.I-131
| Labi | xi | ui | Date of measurement |
| kBq | kBq | ||
| ANSTO | 40 450 | 220 | March 2009 |
| BARC | 40 070 | 190 | March 2009 |
| INER | 41 190 | 170 | March 2009 |
| KRISS | 41 300 | 100 | March 2009 |
| OAP | 40 920 | 640 | March 2009 |
| PTKMR | 39 900 | 900 | March 2009 |
CCRI(II)-S6.I-131
| Labi | xi | ui | Date of measurement |
| kBq | kBq | ||
| LNMRI/IRD | 40 160 | 540 | July 2006 |
|
|
EURAMET.RI(II)-K2.I-131
| Labi | xi | ui | Date of measurement |
| kBq | kBq | ||
| ENEA-INMRI | 40 290 | 170 | December 2015 |
