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).

Comparison
Comparison close
CC comparison
Linked comparison
CCRI(III)-K8.2024
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
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
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

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