Commissariat a L'energie Atomique

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

Loïck Verger

Eric Gros D'Aillon

Guillaume Montemont

Patrice Ouvrier-Buffet

Olivier Monnet

Lucie Guerin

Jacques Rustique

Veronique Rebuffel

Francis Glasser

Jean-Paul Bonnefoy-Claudet

Marie-Claude Gentet

Véronique Rebuffel

Marie Ruat

Arnaud Drezet

Murali Rosaz

Gerard Sanchez

Francedillacoise Mathy

Eric Gros D'aillon

Techniques for controlling a stability of response of a semi-conductor matrix imager composed of pixels, including a first phase of characterizing the stability of the pixels and a second phase of correcting the signals arising from the pixels during the measurements. The pixels are classed into stable pixels and unstable pixels according to a predetermined criterion, the unstable pixels being associated individually with a stable pixel whose characteristics serve as base for correcting signals arising from the unstable pixels.

Method for determining and correcting the stability of response of a semi-conductor matrix detector

A method for manufacturing an ionizing radiation detection device having a block of a semiconductor material adapted to undergo local separations of charges between positive and negative charges under the effect of ionizing radiation. The device including a first series of at least two collecting electrodes formed on the surface of the semiconductor block, and a second series of at least two non-collecting electrodes formed on a support and separated from the semiconductor block by an insulating layer. During processing, after forming the insulating layer on the support so as to cover the non-collecting electrodes, the block of semiconductor material bearing the collecting electrodes and the support bearing the non-collecting electrodes and the insulating layer are assembled.

Method of manufacturing an ionizing radiation detection device

This device for the detection of ionizing radiation includes a stack integrating a first set of electrodes (), a solid detector material sensitive to ionizing radiation (), capable of interacting therewith by releasing electron and electron hole mobile charge carriers, and a second set of electrodes (), said first and second sets of electrodes being polarized in such a way that an electric field is applied through the detector material (), thereby allowing the charge carriers generated by the interaction between the detector material and the ionizing radiation to migrate. It further includes electrically insulated electrodes (-), known as non-collecting electrodes, and positioned in the volume of the detector material () subjected to the electric field, and capable, by capacitive effect, of detecting the charges induced by the migration of the charge carriers in the volume of the detector subjected to the electric field.

Radiation detection device

A method for underwater packaging of radioactive materials includes creating a vacuum in a cavity of a cleaning device to automatically cause a portion of the cleaning device to move upward to actuate the cleaning device from an open position to a closed position; mounting the cleaning device inside a safe containment area of a transportation and/or storage device; placing the transportation and/or storage device in a pool after filling the safe containment area with water; loading a radioactive material into the safe containment area; closing the transportation and/or storage device using at least one cover; extracting the transportation and/or storage device from the pool; draining the water inside the safe containment area; and creating a pressure differential in the safe containment area to dry the safe containment area, wherein the pressure differential causes the cleaning device to automatically actuate from the closed position to the open position.

Gamma-camera utilizing the interaction depth in a detector

A method for reconstructing an image of a source (S) of photons from interactions of photons emitted by this source with a detector () of a gamma-camera, positioned behind a collimator (), the method including associating with each photon interaction with the detector, a piece of information relating to the depth in the detector, of this interaction, and reconstructing an image of the source (S) of photons from said depth information in the detector.

A radiation detection device, including a detector in semi-conductor material, a first electrode, and a second electrode. The first electrode has a form of pixels, with a first pitch, on one of the sides of the detector. The device further includes a mechanism for identifying the energy of an incident photon in the detector as a function of signals coming uniquely from the second electrode.

Device and method for measuring the energy and position of an incident ionising particle in a detector

A detecting device comprises at least one 2-dimensional set of elementary sensors of the semiconductor type for transforming energy of radiation to be detected into electric signals. Each elementary sensor is provided on one side with an anode and on the opposite side with a cathode adapted to be electrically connected on a circuit for reading and operating on the signals. The anodes are electrically interconnected to constitute a plurality of anode subsets electrically connected at least in pairs to a measuring anode path looped on said reading and operating circuit. Each anode is connected to two separate measuring anode pats. The cathodes are electrically interconnected to constitute adjacent cathode subsets, each cathode subset being electrically connected to a measuring cathode path. The anodes belonging to two anode subsets and connected to a common anode path are associated with sensors whereof the cathodes belong to separate cathode subsets.

Electromagnetic and particle detector with reduced number of connections

A tomograph type detection device including a plurality of detection elements arranged in a form of a ring and electrodes on each face of the elements. Each electrode includes a connector, all the connectors being located on the external periphery of the ring of detection elements.

Tomograph comprising detectors having a specific shape

This is a processing circuit for a spectrometry chain including a particle radiation detector (), including a charge preamplifier stage () receiving a current (I) from the detector, representative of the amount of charges emitted by a particle which has interacted with the detector, and an integrator stage (). A differentiator stage () is connected between the charge preamplifier stage () and the integrator stage (), the differentiator stage () receiving a signal (V) from the charge preamplifier stage () and delivering to the integrator stage (), a signal (V), image of the detector current (I), the integrator stage () delivering, an image (V) of the amount of charges emitted by a particle which has interacted with the detector. Application notably to the high energy single channel probes.

Enhanced processing circuit for spectrometry system and spectrometry system using same

This method for optimizing the performance of a semiconductor detector intended to detect electromagnetic radiation, especially X-rays or &#x3b3; rays, equipped with electrodes separately mounted on two opposite surfaces of said detector, namely a cathode and a pixelated anode respectively, involves (i) determining the signal that is representative of the sum of the charges detected by all or some of the anodes; and (ii) using the signal that is representative of said sum of the charges to establish one or more biparametric spectra as a function of this signal so as to determine any charge collection loss if charge sharing occurred on the pixelated anodes and, consequently, performing appropriate processing depending on the type of result desired.

Method for optimizing the performance of a semiconductor detector

A method for exploiting a signal provided by a detector is disclosed. For one embodiment, the time spent by at least one part of the signal above a value Sof a first threshold is determined. The charge corresponding to the part of the signal during the time spent above the value Sof the first threshold is determined. A new value S'of the first threshold as a function of the charge and the time spent above the value Sof the first threshold is determined. The steps of determining the time spent by at least one part of the signal above a value Sof a first threshold and determining the charge corresponding to the part of the signal during the time spent above the value Sof the first threshold are reiterated at least once using the new value of the first threshold.

Spectra acquisition system with threshold adaptation integrator

The present invention relates to a low- and high-energy ionizing radiation detection apparatus composed of a semiconductor material provided with a cathode, an anode and at least one grid to form a radiation detector with a very high energy resolution rate that operates at ambient temperature.

Ionizing radiation detection apparatus using high-resistivity

The invention relates to a method and device for using a signal, or a set of data representative of the time variation of a signal output by a semiconductor detector (52), in response to the interaction of a .gamma. photon with the semiconductor material in which a signal or data is produced, being representative of the rise time of the electronic component of the signal output by the detector. The total detected charge may also be measured. Charge-rise time correlation curves are created.

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Grenoble, France

Loïck Verger