BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51
MEASURAND : SIR equivalent activity of 51Cr
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in MBq
-k1.cr-51_graph_feb09.gif)
Red diamonds and black squares: participants in BIPM.RI(II)-K1.Cr-51
Green triangle: participant in APMP.RI(II)-K2.Cr-51 (2004)
The black colour identifies participant's results prior to 1983
Note: the right-hand axis shows approximate relative values only
BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51
MEASURAND : SIR equivalent activity of 51Cr
| Lab i | Di | Ui |
| / MBq | / MBq | |
| IRMM | -4.1 | 2.5 |
| CMI-IIR | 0.7 | 2.7 |
| MKEH | -0.7 | 2.6 |
| PTB | -0.4 | 2.0 |
| NIST | 1.4 | 3.0 |
| NMIJ | -0.9 | 3.1 |
| NPL | -1.0 | 6.2 |
| LNE-LNHB | 1.2 | 2.3 |
| VNIIM | 0.3 | 2.6 |
In green: participant in APMP.RI(II)-K2.Cr-51
Results are presented under A4 printable format in Summary Results (.PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section II (Measurement of Radionuclides) |
| Description | ACTIVITY OF RADIONUCLIDE Cr-51 |
| Time of measurements | 2022 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Activity per mass kBq/g |
| Transfer device | Radioactive 51Cr solution |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| RMO Internal Identifier | EURAMET Project 1554 |
| Comments | The comparison is organized in a frame of EURAMET Mentoring Scheme Award MSA-002-2022_POLATOM-LNHB |
| Pilot institute |
POLATOM
Radioisotope Centre Polatom Poland |
| Contact person | Ryszard Broda +48 22 273 19 53 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51
MEASURAND : SIR equivalent activity of 51Cr
| Key comparison reference value: The SIR reference value for this radionuclide is xR = 488.0 MBq, with a standard uncertainty uR = 0.3 MBq, see section 4.1 of the Final Report dated January 2009. |
| The degree of equivalence of each laboratory 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. With n the number of laboratories,  when each laboratory has contributed to the computation of xR, see Metrologia, 42, 140-144. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in MBq. The approximation Uij ~ 2(ui2 + uj2)1/2 is used for the computation of the pair-wise degrees of equivalence. |
| The value xi is the equivalent activity for laboratory i participant in APMP.RI(II)-K2.Cr-51 having been normalized to the value of NMIJ as the linking laboratory (see Final Report dated October 2005). |
| The degree of equivalence of laboratory i participant in APMP.RI(II)-K2.Cr-51 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 in the Matrix of equivalence. |
| The degree of equivalence between two laboratories i and j is given by a pair of terms: Dij = Di - Dj and Uij, its expanded uncertainty (k = 2), both expressed in MBq, where the approximation Uij = 2(ui2 + uj2 - 2ful2)1/2 is used (l is the NMIJ and f the correlation coefficient). |
BIPM.RI(II)-K1.Cr-51 and APMP.RI(II)-K2.Cr-51
MEASURAND : SIR equivalent activity of 51Cr
xi : result of measurement carried out in the SIR for the sample submitted by laboratory i
ui : combined standard uncertainty of xi
| Lab i | xi / MBq |
ui / MBq |
Date of measurement |
| IRMM | 483.9 | 1.1 | 1981-06-17 |
| CMI-IIR | 488.7 | 1.4 | 1982-06-30 |
| MKEH | 487.3 | 1.3 | 1989-10-09 |
| PTB | 487.6 | 0.9 | 1998-04-24 |
| NIST | 489.4 | 1.4 | 1999-05-03 |
| NMIJ | 487.1 | 1.6 | 2004-03-15 |
| NPL | 487.0 | 3.4 | 2004-05-28 |
| LNE-LNHB | 489.2 | 1.1 | 2006-07-17 |
xi : result of measurement carried out at laboratory i, converted to the equivalent activity through the NMJ SIR measurement (see Final Report dated October 2005)
ui : combined standard uncertainty of xi
| Lab i | xi / MBq |
ui / MBq |
Date of measurement |
| VNIIM | 488.3 | 1.2 | 2004 |
