CCRI(III)-K9.AmBe, CCRI(III)-K9.AmBe.2 and CCRI(III)-K9.AmBe.1
MEASURAND Neutron source emission rate
SOURCE 241Am-Be(α,n)
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in s-1.
CCRI(III)-K9.AmBe, CCRI(III)-K9.AmBe.2 and CCRI(III)-K9.AmBe.1
MEASURAND Neutron source emission rate
SOURCE 241Am-Be(α,n)
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in s-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
s-1 |
s-1 |
s-1 |
||
| CIAE | -6.47E+04 | 3.34E+04 | ||
| CMI | -1.27E+04 | 3.68E+04 | ||
| KRISS | -2.71E+03 | 2.65E+04 | ||
| LNE-LNHB | -1.46E+05 | 6.52E+04 | ||
| LNMRI | -4.71E+03 | 2.50E+04 | ||
| NIST | -3.57E+04 | 5.25E+04 | ||
| NPL | -1.27E+04 | 2.72E+04 | ||
| VNIIM | 2.53E+04 | 2.04E+04 | ||
| ENEA-INMRI | 3.41E+05 | 8.00E+04 | ||
| LNE-LNHB | -7.19E+04 | 7.06E+04 | ||
| NIM | -6.12E+03 | 5.87E+04 |
| Metrology area, Sub-field | Ionizing Radiation, Section III (Neutron Measurements) |
| Description | Comparison of emission rate |
| Time of measurements | 1999 - 2005 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Emission rate |
| Transfer device | AmBe source |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Comments | Results published on 06 October 2011 Comparison of emission rate |
| Pilot institute |
NPL
National Physical Laboratory United Kingdom |
| Contact person | Neil Roberts +44 (0) 20 8943 6869 |
| Pilot laboratory | |
|---|---|
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| CMI |
Czech Metrology Institute, Czechia, 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 |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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CCRI(III)-K9.AmBe, CCRI(III)-K9.AmBe.2 and CCRI(III)-K9.AmBe.1
MEASURAND Neutron source emission rate
SOURCE 241Am-Be(α,n)
CCRI(III)-K9.AmBe
The key comparison reference value xR and its standard uncertainty uR have been calculated from the participants' results, excluding CIAE and LNE-LNHB data (see details in Section 5.1.1 and Appendix A of the Final Report).
xR = 2.445 x 106 s-1
uR = 0.006 x 106 s-1
The degree of equivalence of laboratory i with respect to xR is given by a pair of terms: Di and Ui its expanded uncertainty (k = 2), both expressed in s-1.
Linking CCRI(III)-K9.AmBe.2 to CCRI(III)-K9.AmBe
The results obtained in CCRI(III)-K9.AmBe.2 were linked to CCRI(III)-K9.AmBe via NPL (United Kingdom) who participated in both comparisons.
Linking CCRI(III)-K9.AmBe.2 to CCRI(III)-K9.AmBe
The results obtained in CCRI(III)-K9.AmBe.1 were linked to CCRI(III)-K9.AmBe via NPL (United Kingdom) who participated in both comparisons.
CCRI(III)-K9.AmBe, CCRI(III)-K9.AmBe.2 and CCRI(III)-K9.AmBe.1
MEASURAND Neutron source emission rate
SOURCE 241Am-Be(α,n)
xi emission rate submitted by each institute i at the reference date of 1 January 2000
ui combined standard uncertainty of xi
CCRI(III)-K9.AmBe
-K9.AmBe LIM.png)
(a) The NPL value is an average of the measurements made in 1999 and 2004.
(b) The VNIIM value is an average of results obtained for the manganese bath and associated particle measurements.
CCRI(III)-K9.AmBe.2
-K9.AmBe.2 LIM.png)
CCRI(III)-K9.AmBe.1
-K9.AmBe.1 LIM.png)
