Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Romain Coulon

Sylvain Magne

Matthieu Hamel

Vladimir Kondrasovs

Karim Boudergui

Stéphane Normand

Guillaume Laffont

Guillaume Bertrand

Mounir Bakkali

Jonathan Dumazert

Frédérick Carrel

Quentin Lecomte

Sara Garti

Fabien Sguerra

A measuring system includes a detector having an optical waveguide including a primary dopant capable of transmuting, by neutron capture, into a stable secondary dopant that is less neutron-absorbent than the primary dopant, a moderation layer suitable for slowing down fast neutrons, and an analysis device connected to the detector. The analysis device is configured to inject, into the waveguide, an interrogation wave having a wavelength corresponding to an absorption peak of the secondary dopant, detect a response wave emitted by the waveguide, calculate, from the detected response wave, a piece of information relating to a concentration of secondary dopant in the waveguide, and, based on the information relating to the calculated concentration of secondary dopant, determine a fluence of fast neutrons during a predetermined secondary period.

System for measuring fast neutron fluence for a nuclear reactor, associated installation, measurement method and computer program product

The invention relates to a scintillator for detecting neutrons and/or gamma photons, characterized in that it comprises a structure consisting of two undoped plastic materials for detecting neutrons and which contain different fluorescent complexes, a first plastic material containing at least one fluorescent complex able to produce a fluorescence light having a first relaxation time and the second plastic material containing at least one fluorescent complex able to produce a fluorescence light having a second relaxation time higher than the first relaxation time.

Scintillator for detecting neutrons and/or gamma photons and associated detector

A method for detecting a radioactive source moving on a linear path substantially parallel to an alignment of N detectors. The method includes: forming N&#xd7;Npulse counting values M(i=1, 2, . . . , N and t=1, 2, . . . , N) from N&#xd7;Ndetection signals delivered by the N detectors in the form of a succession over time of Nsets of N signals simultaneously detected by the N detectors over a same duration &#x394;t, a pulse counting value representing a number of pulses detected by a detector over a duration &#x394;t; and computing, using a computer: a set of Ncorrelation products R, a static meanof the N&#xd7;Ncounting values, a correlation condition for each correlation product R.

Method for detecting a moving radioactive source and associated device

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Chaulgnes, France

Romain Coulon