MEASURAND : Thermal neutron fluence
Graph of equivalence
MEASURAND : Thermal neutron fluence
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
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 |
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 |
LNE-IRSN |
Institut de Radioprotection et de Sûreté Nucléaire, France, EURAMET |
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 |
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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 |