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

Stéphane Normand

Vladimir Kondrasovs

Karim Boudergui

Matthieu Hamel

Gwenole Corre

Romain Coulon

Stéphane Darbon

Mounir Bakkali

Hassen Hamrita

Guillaume Sannie

Jean-michel Bourbotte

Loïc Barbot

Pauline Blanc

Chrystele Dehe-Pittance

Licinio Rocha

Mathieu Trocme

Vesna Simic

Anne-Marie Frelin

Grégory Turk

Chrystèle Pittance

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

The invention relates to the use of 1,8-naphthalimide derivatives and of their salts as scintillation agents and more specifically as agents for discriminating between fast neutrons and gamma rays. It also relates to liquid scintillators comprising these scintillation agents in solution in a solvent and to novel 1,8-naphthalimide derivates of use as scintillation agents, in particular for discriminating between fast neutrons and gamma rays. Applications: all the fields of use of scintillators and in particular industry, geophysics, fundamental physics, in particular nuclear physics, the safety of goods and people, protection from radiation of workers in the industrial, nuclear and medical sectors, medical imaging, and the like.

1,8-naphthalimide derivatives as scintillation agents, in particular for discriminating between fast neutrons and gamma rays

A system for controlling photomultiplier gain drift is disclosed. According to one aspect, the system includes first means for measuring a noise signal of the photomultiplier, the first means configured emit a measurement signal representative of the photomultiplier's noise signal. The system further includes second means for maintaining the measured noise signal at a constant level, based on the measurement signal. The disclosed embodiments apply to stabilization of the gain of photomultipliers and, more specifically, to stabilization of neutron measurement systems using photomultipliers.

System for controlling photomultiplier gain drift and associated method

A system for transmitting an electrical signal, notably a frequency-related electrical signal, includes two conducting lines each having a central conductor surrounded by a conducting sheath, the lines being coupled and isolated from one another at each end by a transformer. The central conductor of a line is linked at the input of the system to a coil of a first transformer and at the output of the system to a coil of the second transformer. The invention is applied for example for the transmission of strongly disturbed environment measurement signals.

System for transmitting an electrical signal, in particular frequency-related, and radiation measurement device equipped with such a system

Growing community of inventors

Mantes la Jolie, France

Stéphane Normand