Abstract: A device for measuring exposure to radiations including at least a component for detecting photons including at least a component for detecting photons or particles associated with at least one circuit for acquiring and counting detection events. The response curve of the number of counted events versus the number of photons or particles sensed by each detection component is a monotonous increasing curve.

Abstract: The particle detection circuit comprises a plurality of basic circuits. Each basic circuit comprises a particle detector element connected to an associated counter and a summing circuit having a first input connected to the output of the counter. Basic circuits, each forming a subpixel, are grouped together by series connection of their summing circuits to form a pixel. The output of the pixel, formed by the output of the summing circuit of a last basic circuit of the pixel, supplies counting signals representative of the number of particles detected by the set of basic circuits of the pixel. Disabling certain basic circuits of the pixel, by selective zero resetting of the first input of their summing circuit, can enable only the particles detected by certain zones of the pixel to be counted.

Abstract: This device for detecting an electromagnetic radiation, comprises a matrix of juxtaposed elementary sensors (1), each associated with a common substrate in which a sequential addressing read circuit is prepared, specific to each of the sensors, thereby constituting as many pixels, the interaction of the radiation with the sensors generating electric charges to be converted to voltage for their subsequent processing, each of the said sensors being biased via an injection transistor (2), of which one of the terminals is connected to an integration capacitance (3), storing the electric charges generated by the sensor during an integration phase, and whereof the quantity of charges is then processed for conversion to voltage. Each of the pixels of the said matrix is associated with a current limiting device (5), for limiting the current generated by each of the elementary sensors to a maximum called reference current, regardless of the radiation flux received by the pixel concerned.

Abstract: An apparatus adapted to measure of current pulses that are very brief (a few nanoseconds) and of very low amplitude (a few microamps), such as those that can emanate from a photodetector used for the optical transmission of data at very high speed, or from a photodetector (photodiode or photoconductor) subject to a radiation that is of pulsed nature (in particular: X, gamma and other radiations). The circuit includes an integration stage (IT), a differentiation stage (DR), and a subtraction stage (SS). The time constants Rp.Cint and R2.C2 of the integration and differentiation stages are preferably equal.

Abstract: A device for measuring exposure to radiations including at least a component for detecting photons including at least a component for detecting photons or particles associated with at least one circuit for acquiring and counting detection events. The response curve of the number of counted events versus the number of photons or particles sensed by each detection component is a monotonous increasing curve.

Abstract: The invention concerns a radiation detection device comprising a plurality of detector elements (DET1, DET2), each detector element (DET1) being associated with a circuit (AMP1-CMP1) for acquiring pulse signals (H1) and for counting (CNT1) detection events. The invention provides for means (COR) of correlating detection events corresponding to at least two detector elements (DET1/DET2).

Abstract: The invention relates to the measurement of current pulses that are very brief (a few nanoseconds) and of very low amplitude (a few microamps), such as those that can emanate from a photodetector used for the optical transmission of data at very high speed, or from a photodetector (photodiode or photoconductor) subject to a radiation that is of pulsed nature (in particular: X, gamma and other radiations). The circuit according to the invention comprises an integration stage (IT), a differentiation stage (DR), and a subtraction stage (SS). The time constants Rp.Cint and R2.C2 of the integration and differentiation stages are preferably equal.

Abstract: A charge pump including n cells in series, each cell comprising a shift capacitor (Cdi) and a storage capacitor (Cmi), respectively having a shift parasitic capacitor (Cpi) and a storage parasitic capacitor (Cqi). The presence of the parasitic capacitors (Cpi, Cqi) leads to a loss of charge transmitted to the cell. Each cell comprises charge injection means (Cdinji, Cminji) for partially or totally compensating, or even overcompensating, the lost charge quantity. The charge pump may be implemented in silicon-on-insulator technology.

Abstract: The invention concerns a radiation detection device comprising a plurality of detector elements (DET1, DET2), each detector element (DET1) being associated with a circuit (AMP1-CMP1) for acquiring pulse signals (H1) and for counting (CNT1) detection events. The invention provides for means (COR) of correlating detection events corresponding to at least two detector elements (DET1/DET2).

Abstract: The invention relates to a charge pump.

Abstract: A compact detection device for a gamma camera comprises: several detectors (4a, 4b, . . . ) adjacent to each other to form a detection plane (4); a first ceramic substrate (1); a second substrate (3) on which the detectors are arranged; means (10b) of polarizing the detection plane and the signal processing means (10c) for the signal detected by the said detection plane, located in the first substrate; and a ground plane (2) placed between the first and the second substrates.

Abstract: The invention relates to a spectrometric detection system comprising a block (6) of semi conducting material, a cathode (7) fixed on the first face of the block of semi conducting material, and an anode (8) fixed on a second face of the block of semi conducting material, the first and second faces being opposite to each other.

Abstract: A micro gamma camera having several gamma radiation detection devices adjacent to each other. The detection devices are laid out above an information processing device that processes information output by the detection devices. Each of the detection devices includes: a plurality of detectors positioned adjacent to each other to form a detection plane; a first substrate including a detection plane polarizer and a first signal processor for processing the signal detected by the detection plane; a second substrate placed between the detection plane and the first substrate; a ground plane placed between the first and second substrates; and a third substrate including second and third signal processors.

Abstract: A semiconductor base device for the detection of gamma radiation. The semiconductor base device includes a semiconductor base detector with a resistivity exceeding 109 &OHgr;·cm. An operational amplifier is located directly at the detector output, without a decoupling capacitor between the detector and the preamplifier. A data processing device makes use of the rise time of the electronic component of a signal output by the detector.

Abstract: The invention relates to a device for measuring the rise time of the electronic component of a signal disturbed by electronic noise and whose signal-to-noise ratio is mediocre. It incorporates a differentiating circuit (C12, C11) having at least one resistor (r) and one capacitor (c) implementing a high pass filter for filtering the low frequency background noise of the signal from the detector and a discriminating circuit (C21, C22) incorporating a comparator (k) for performing a comparison with the filtered signal from the differentiating circuit and an offset voltage selected as a function of the noise level interfering with the signal from the detector.