5 results about "Coincidence circuit" patented technology

A method for increasing the detection field of view of a SPECT arrangement, which is implemented by using a SPECT system (1) comprising one or more detection groups (11), each detection group comprising a detector (21), coincidence circuit (22), computer (23), the detector is arranged in a circumferentially uniform manner with the detection surface facing the detection area, first in a first position; the center of the detection surface of each detector is displaced laterally by a distance of not less than 3 cm or not less than 10% of the width of the detection surface of the detector to reach a second position; under the premise that the distance between the center of the detection surface of each detector and the center of the detection area is d, all detectors are rotated by a plurality of turns under the drive of the gantry, and the received detection signals are transmitted to the computer through the coincidence circuit, and the SPECT system controls all computers to complete image reconstruction. The detector is composed of a collimator layer (211), a scintillation crystal layer (212), a light guide layer (213), and a PMT array layer (214).

The utility model relates to a high-sensitivity radioactive gas activity measuring device which comprises a set of double-beta plastic scintillator detector, two sets of gamma detectors, an anti-cosmic ray detector group and a digital coincidence circuit. The double-beta plastic scintillator detector and the gamma detectors are arranged in the lead shielding chamber, the double-beta plastic scintillator detector is arranged between the two gamma detectors, and mutual interference among radioactive gases in the double-beta plastic scintillator detector can be eliminated through coincidence and anticoincidence among four paths of signals; and the anti-cosmic ray detector group is used for shielding coincidence signals generated by cosmic rays in the double-beta plastic scintillator detector and the gamma detector. According to the utility model, a gamma detector original spectrum, an anti-cosmic ray gamma spectrum, a beta-gamma coincidence spectrum and an anti-cosmic ray beta-gamma coincidence spectrum, wherein the beta-gamma coincidence spectrum and the anti-cosmic ray beta-gamma coincidence spectrum are used for eliminating mutual influence among different radioactive gases. According to the utility model, synchronous measurement of different radioactive gases can be realized, and the detection sensitivity of the radioactive gases can be greatly improved.

The invention discloses a detection device capable of directly measuring surface pollution in a high background environment. The detection device comprises a shell; the thin plastic flash probe, the thick plastic flash crystal probe, the signal acquisition and amplification module, the threshold discrimination circuit, the anticoincidence circuit, the signal analysis and counting processing module, the display module and the power supply are arranged on the shell, the thin plastic flash probe is used for responding to alpha / beta rays, and the thick plastic flash crystal probe is used for responding to gamma rays. The threshold discrimination circuit is used for discriminating noise in output signals of the two probes and converting nuclear pulses into square signals, the anti-coincidence circuit receives the square signals of the threshold discrimination circuit, and the signal analysis and counting processing module counts, calculates, stores and compares pulse signals output by the anti-coincidence circuit and outputs a display result. The result is displayed on a display screen of the display module; and a power supply. The structure is simple, high-precision micromachining is avoided, machining and manufacturing are simple and easy to achieve, and corresponding later maintenance is also convenient and simple.

Exemplary methods of the present disclosure are directed to: growing a diamond layer by using a mold that is used to structure the diamond layer so that it conforms to a circuit device. The circuit device has a heat-sink side and another side to connect with a signal and power routing redistribution region, and the method further includes: planarizing one or two surfaces of the diamond layer to realize a surface roughness (on one or both sides) that is sufficient to set a thermal boundary resistance (e.g., less than 20 m2K / GW and / or less than 50 nm RMS); applying a gap-filling thermal interface material (TIM) layer to fill gaps along the surface(s); and positioning a heat sink on the heat-sink side of the circuit device, wherein the surface roughness of the diamond layer and the gap-filling TIM layer are cooperatively arranged to facilitate transfer of heat from the circuit device into the heat sink.

The invention provides a double-GM tube fault detection system and method, electronic equipment and a storage medium, and relates to the technical field of ionizing radiation detection, and the system comprises a single-chip microcomputer, a coincidence circuit and an anti-coincidence circuit. The single-chip microcomputer sends a first preset level signal to the anti-coincidence circuit within a preset time, so that the coincidence circuit stops working, and the anti-coincidence circuit starts working; the anticoincidence circuit obtains the first GM signal and the second GM signal, and sends a first fault detection signal or a second fault detection signal to the single-chip microcomputer according to the first GM signal and the second GM signal; when a first fault detection signal is received, the single-chip microcomputer determines the first GM tube as an abnormal GM tube, and when a second fault detection signal is received, the single-chip microcomputer determines the second GM tube as an abnormal GM tube; and when a second preset level signal is received and the gas collection card is inserted into the measurement chamber, the coincidence circuit starts to work. According to the invention, automatic diagnosis and rapid positioning of faults of the double GM tubes are realized, and the troubleshooting efficiency is improved.