Commissariat a L'energie Atomique Et Aux Energies Alternatives

Vladimir Kondrasovs

Stéphane Normand

Karim Boudergui

Stephane Normand

Gwenole Corre

Romain Coulon

Guillaume Sannie

Hassen Hamrita

Matthieu Hamel

Hamid Makil

Mounir Bakkali

Loïc Barbot

Jonathan Dumazert

Chrystele Pittance

Jean-michel Bourbotte

Licinio Rocha

Mathieu Trocme

Jean-Michel Bourbotte

Anne-Marie Frelin

Chrystèle Pittance

An amplification device including: a switch including an output that is suitable for being connected to a first or a second input; a first branch that is connected to the first input, which applies a first gain to generate a first amplified signal; a second branch that is connected to the second input, which applies a second gain to generate a second amplified signal; a controller for controlling the switching of the switch to apply the first or the second amplified signal to the output, depending on whether or not the value of a predetermined quantity of the first amplified signal falls within a predetermined range. The first gain and the second gain being non-zero real numbers of opposite sign.

Electronic amplification device, measurement apparatus and associated measurement method

A method and system to identify an isotope provided in a medium to be characterized by an instrumentation system. The identification method includes: measuring at least one reference spectrum for at least two reference isotopes; defining measurement windows for each reference isotope; measuring a measured spectrum on the medium to be characterized; for each reference isotope, calculating for each of the measurement windows a deviation value representing the deviation between the measured spectrum and that of the reference isotope in the measurement window; for each reference isotope, determining from the calculated deviation values a dissimilarity coefficient; and identifying the isotope from the determined dissimilarity coefficients.

Method for identifying an isotope, program for identifying an isotope and device for identifying isotopes

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

A radiation detecting system, including: plastics scintillators juxtaposed to form at least one pair of contiguous plastics scintillators; a photomultiplier associated with each plastics scintillator to provide an electrical signal representative of the light signal generated in the plastics scintillator; a calculator connected to the photomultipliers and configured to: detect pulse coincidences between two electrical pulses provided by the photomultipliers associated with a pair of contiguous plastics scintillators; for each pulse coincidence, determine the time offset between the coincidence pulses relative to the pulse having the greatest amplitude taken as a zero reference; determine the number of pulse coincidences the time offset of which is included in a time offset window.

System and method for detecting neutron, gamma and muon radiations with contiguous plastics scintillators

A method for processing electrical signals from a phoswich scintillator including an upstream scintillator and a downstream scintillator, the method including, for each electrical signal: digitization of the electrical signal; determination of an amplitude and an integral surface area of the digitized electrical signal; and representation of an event associated with an electrical signal by a pair of data items.

Method for processing a signal from a phoswich scintillator, and associated scintillation detector

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.

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Palaiseau, France

Vladimir Kondrasovs