MEASURAND : Thermal neutron fluence
Graph of equivalence
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MEASURAND : Thermal neutron fluence
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
-k8_does.gif)
Results are presented under A4 printable format in Summary Results (PDF file).
| Metrology area, Sub-field | Ionizing Radiation, Section III (Neutron Measurements) |
| Description | Neutron fluence in thermal neutron fields |
| Time of measurements | 2024 - 2026 |
| Status | Protocol complete |
| References | |
| Measurand | Neutron fluence |
| Transfer device | He-3 counter, naked and surrounded with a small diameter Bonner Sphere |
| Comparison type | Key Comparison |
| Consultative Committee | CCRI (Consultative Committee for Ionizing Radiation) |
| Conducted by | CCRI (Consultative Committee for Ionizing Radiation) |
| Pilot institute |
NIM
National Institute of Metrology China |
| Contact person | Hui Zhang +861064525006 |
| Additional |
| Pilot laboratory | |
|---|---|
| NIM |
National Institute of Metrology, China, APMP |
| BARC |
Bhabha Atomic Research Centre, India, APMP |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| ENEA-INMRI |
Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, Italy, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNMRI/IRD |
Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD, Brazil, SIM |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SCK.CEN/LNK |
Nuclear Calibration Laboratory, Belgian Nuclear Research Centre, Belgium, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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" :
MEASURAND : Thermal neutron fluence
|
The key comparison reference value, xR, is taken as 1. |
| The degree of equivalence of each laboratory i 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 cm2/cm2. Ui = 2ui. |
| When required, 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 cm2/cm2. Pair-wise degrees of equivalence are given in Table 3 of the Final Report. |
MEASURAND : Thermal neutron fluence
xi : measurement result obtained by laboratory i expressed as the mean ratio of measured instrument response by laboratory i to the reference instrument response
ui : combined standard uncertainty of xi
Measurements were performed between October 2006 and July 2010
|
Lab i |
xi |
ui |
| NMIJ | 0.993 | 0.019 |
| NPL | 0.918 | 0.025 |
| PTB | 0.987 | 0.036 |
