111 results about "High energy resolution" patented technology

New sensors, pixel detectors and different embodiments of multi-channel integrated circuit are disclosed. The new high energy and spatial resolution sensors use solid state detectors. Each channel or pixel of the readout chip employs low noise preamplifier at its input followed by other circuitry. The different embodiments of the sensors, detectors and the integrated circuit are designed to produce high energy and/or spatial resolution two-dimensional and three-dimensional imaging for different applications. Some of these applications may require fast data acquisition, some others may need ultra high energy resolution, and a separate portion may require very high contrast. The embodiments described herein addresses these issues and also other issues that may be useful in two and three dimensional medical and industrial imaging. The applications of the new sensors, detectors and integrated circuits addresses a broad range of applications such as medical and industrial imaging, NDE and NDI, security, baggage scanning, astrophysics, nuclear physics and medicine.

New sensors and different embodiments of multi-channel integrated circuit are provided. The new high energy and spatial resolution sensors use both solid state and scintillator detectors. Each channel of the readout chip employs low noise charge sensitive preamplifier(s) at its input followed by other circuitry. The different embodiments of the sensors and the integrated circuit are designed to produce high energy and/or spatial resolution two-dimensional and three-dimensional imaging for widely different applications. Some of these applications may require fast data acquisition, some others may need ultra high energy resolution, and a separate portion may require very high contrast. The embodiments described herein addresses all these issues and also other issues that may be useful in two and three dimensional medical and industrial imaging. The applications of the new sensors and integrated circuits addresses a broad range of applications such as medical and industrial imaging, NDE and NDI, security, baggage scanning, astrophysics, nuclear physics and medicine.

A design and readout of a xenon detection medium based device, which provides improved spectroscopic performance compared to currently commercially available devices. To achieve energy resolution improvement, a method to accurately measure radial spatial position for interacting events within a HPXe cylindrical detector is described using the plan as shown in FIG. 4. This is accomplished by utilization of light generated both at the gamma interaction site and at the collection point near the anode wire of the cylindrical detector. These light flashes are detected by a VUV photon detector. Light transmission is facilitated by incorporating a vacuum ultraviolet (VUV) light transparent window at least one end of the cylindrical ionization detector. With the known electron drift velocity in HPXe, the time between these two photopulses is sufficient to accurately determine the radial coordinate. Consequently, correction by electronic means for the electrostatic pulse dispersion using the expression graphed in FIG. 2 can be achieved in order to approach the true intrinsic energy resolution limit for HPXe.

The radiological imaging system which can improve an energy resolution and perform a diagnosis with high accuracy includes a bed for carrying an examinee H, first and second imaging apparatuses and disposed along the longitudinal direction of the bed. The first imaging apparatus has a plurality of semiconductor radiation detectors for detecting γ-rays emitted from the examinee H, arranged around the bed, the second imaging apparatus has an X-ray source for emitting X-rays to the examinee H and a radiation detector for detecting X-rays which have been emitted from the X-ray source and passed through the examinee H, and the bed is shared by the first imaging apparatus and the second imaging apparatus.

The invention discloses a low-temperature scanning tunneling microscope using a closed-cycle refrigerator to achieve refrigeration. The low-temperature scanning tunneling microscope comprises a closed-cycle refrigerator system, a helium heat exchange gas refrigeration vibration isolation interface system, a low-temperature scanning tunneling microscope scanning head system, a vacuum system, a vibration reduction platform and a scanning tunnel microscope control system. According to the low-temperature scanning tunneling microscope, under the condition that no liquid helium is consumed, atomic-scale resolution low-temperature ultrahigh-vacuum scanning tunnel microscopy space imaging and high-energy resolution scanning tunnel spectrum accurate measurement can be achieved like a liquid helium refrigeration system. The technical scheme of closed-cycle refrigeration can also be used for other applications needing lower temperature and low-vibration environments like other members of scanning probe microscope families. Large-range temperature changes can also be achieved through feedback combination of heating elements and temperature measuring elements.

A scintillator composition includes a matrix material, where the matrix material includes an alkaline earth metal and a lanthanide halide. The scintillator composition further includes an activator ion, where the activator ion is a trivalent ion. In one embodiment, the scintillator composition includes a matrix material represented by A₂LnX₇, where A includes an alkaline earth metal, Ln includes a lanthanide ion, and X includes a halide ion. In another embodiment, the scintillator composition includes a matrix material represented by ALnX₅, where A includes an alkaline earth metal, Ln includes a lanthanide ion, and X includes a halide ion. In these embodiments, the scintillator composition includes an activator ion, where the activator ion includes cerium, or bismuth, or praseodymium, or combinations thereof.

The invention relates to a LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument. The instrument comprises a probe part, an operating platform, a cable and a winch, wherein the probe part comprises a LaBr3(Ce) crystal gamma ray detector formed by combining LaBr3(Ce) and a photomultiplier, a spectroscope amplifier, a peak holding circuit, a pulse amplitude analyzer and a high and low voltage power supply; the operating platform comprises a power supply converter and a computer; and the spectroscope amplifier receives a pulse signal from the detector, the pulse signal is input into the pulse amplitude analyzer through the peak holding circuit after passing through the spectroscope amplifier, and digital information output by the pulse amplitude analyzer is connected with a 485 communication interface of the computer through a 485 communication interface of the probe, and the cable. The logging instrument can directly measure the characteristic energy spectra of various radionuclides such as a uranium family, a thorium family, potassium and the like in nuclear resource logging, and has the characteristics of high energy resolution, measuring efficiency and stability, and the like.

A gamma ray detector assembly for a borehole logging system that requires the measure of gamma radiation with optimized gamma ray energy resolution and with fast emission times required to obtain meaningful measurements in high radiation fields. The detector assembly comprises a lanthanum bromide (LaBr3) scintillation crystal and a digital spectrometer that cooperates with the crystal to maximize pulse processing throughput by digital filtering and digital pile-up inspection of the pulses. The detector assembly is capable of digital pulse measurement and digital pile-up inspection with dead-time less than 600 nanoseconds per event. Pulse height can be accurately measured (corrected for pile-up effects) for 2 pulses separated by as little as 150 nanoseconds. Although the invention is applicable to virtually any borehole logging methodology that uses the measure of gamma radiation in harsh borehole conditions, the invention is particularly applicable to carbon/oxygen logging.

The invention provides an X-ray and charged particle detector based on graphene electric field effect and a detection method thereof, belongs to the technical field of radiation detection and relates to a novel X-ray and charged particle detector structure. The X-ray and charged particle detector based on graphene electric field effect comprises a semiconductor substrate, a gate electrode, an insulating buffer layer, a source electrode, a drain electrode, a graphene detection layer, a graphene voltage measuring electrode and a constant-current supply electrode. The detector has relatively high energy resolution and time resolution simultaneously, and is applicable to the application fields of X-ray pulsar navigation and traditional radiation detectors and is used for detecting X-rays and charged particles such as alpha rays and beta rays.

The invention discloses a flight mode CdZnTe inspection system and inspection method and belongs to the radiation detection field. The inspection system includes a CdZnTe spectrometer and an aircraft; the aircraft flies with the CdZnTe spectrometer, and therefore, a flight inspection function can be realized, and work efficiency of nuclear radiation monitoring can be improved. Since the CdZnTe spectrometer has the advantages of high energy resolution, small size, light weight and excellent portability, after the CdZnTe spectrometer is combined with the aircraft, the aircraft can have high measuring accuracy and long flight time, can fly over a nuclear accident site to perform on-site operation and inspect the accident site, and therefore, radiation doses accepted by workers who enter the site can be decreased, and support can be provided for rescue.

A superconducting radiation detector uses the abruptness of a superconducting transition edge, converts a slight heat generated by an X-ray into a high signal current, and uses an electrothermal self-feedback mechanism, thereby having a high energy resolution and a high counting rate. In a calorimeter that includes an absorber for absorbing X-rays, a resistor provided under the absorber, a resistance value thereof being changed by heat generated in the absorber, superconducting wires connecting the resistor and an external current detector, and a membrane on which the resistor is superimposed, the resistor being constituted by a superconductor, the calorimeter allowing Joule heat generated by steadily flowing a current in the resistor and the heat generated in the absorber to be thermally balanced and transfer in the membrane, an insulating film is provided between the resistor and the absorber, the film having a hole penetrating the film in the thickness direction.

The invention relates to the field of semiconductor sensors and discloses a semiconductor radiation sensing device and a manufacturing method thereof. The sensing device comprises at least one radiation sensing unit, wherein each radiation sensing unit comprises a first substrate, a first columnar electrode and a second columnar electrode; the first substrate comprises a first surface and a second surface; the first columnar electrode comprises first metal posts and N-type doped silicon surrounding the first metal posts; the second columnar electrode comprises more than two second metal postsand P-type doped silicon surrounding the second metal posts; the first columnar electrode and the second columnar electrode are embedded into the first substrate and pass through the first surface and the second surface of the substrate; the more than two metal posts are arranged in an equilateral polygon mode; and the first columnar electrode is arranged at the geometric center of the equilateral polygon. According to the invention, the thin dead layer thickness of the sensing device, the smaller equivalent capacitance and the shorter signal drifting process can be realized, thus improving the energy resolution, reducing the response time and decreasing the lower limit of energy detection.

The invention discloses a low-background spectrum unscrambling method based on a sodium iodide detector. The method comprises the following steps: (1) a gamma detector after energy calibration actually measures a radionuclide spectrum and a natural background spectrum, and noise reduction is carried out; (2) a deconvolution algorithm is adopted to process a gamma energy spectrum after noise reduction; (3) a peak searching algorithm carries out searching on all potential peak positions of the gamma energy spectrum after noise reduction, and a peak position list is acquired; and (4) the peak position list information and a nuclide library are combined to be together inputted to a fuzzy logic system, the system gives the peak position recognition confidence for any nuclide characteristic peakin the nuclide library, constraints are set to further adjust the peak position recognition confidence, and thus, a nuclide list and the nuclide recognition confidence are acquired. The low-background spectrum unscrambling method based on the sodium iodide detector has the advantages of accurate peak position reduction, remarkable improvement of energy resolution, decomposition of an overlapped peak, low error recognition rate, accurate background nuclide analysis and accurate low activity nuclide analysis, and can be used for nuclide recognition and activity calculation for radiation monitoring equipment such as a gated radiation monitor and a nuclide recognition instrument.

A spectrometer having improved energy resolution by correcting for error introduced by charge carrier trapping. By monitoring the shape of the pulses produced by the detector, a digital filter is adjusted to improve the energy resolution. The adjustment is performed manually by an operator or automatically by an automatic optimizer circuit that modifies the digital filter until the spectral peaks have a width and shape matching the desired characteristics, which are a minimum width and a substantially symmetrical shape. By correcting for the energy loss associated with long rise time events, the charge-trapping correcting spectrometer produces spectral peaks with improved energy resolution.

To provide a superconducting X-ray detector capable of carrying out a measurement by a high energy resolution by restraining a reduction in a sensitivity by a self magnetic field.

A superconducting X-ray detector comprising a temperature detector 6 for detecting a temperature change by heat generated when an X-ray is absorbed, and a heat link 3 for controlling a heat flow amount of escaping the generated heat to a support board 1, wherein the temperature detector 6 comprises a heat conducting multilayer thin film, the superconducting X-ray detector is constituted by a structure of providing a superconductor layer 4 above the heat link 3 and providing an insulating member 2 between the superconductor layer 4 and the temperature detector 6, the superconductor layer 4 and the temperature detector 6 are connected by a superconducting wiring 7 and uses materials by which superconducting transition temperatures of the superconductor layer 4 and the superconducting wiring 7 are higher than a superconducting transition temperature of the temperature detector 6.

An imaging system (100) includes a detector module (114). The detector module includes a block (300) of a plurality of direct conversion photon counting detector pixels (122) and corresponding electronics (124, 604, 606, 132, 134 or 124, 128, 130, 134, 802) with hardware for both high energy resolution imaging mode and high X-ray flux imaging mode connected with the block of the plurality of direct conversion photon counting detector pixels. A method includes identifying a scanning mode for a selected imaging protocol, wherein the scanning modes includes one of a higher energy resolution mode and a higher X-ray flux mode, configuring a detector module, which is configurable for both the higher energy resolution mode and the higher X-ray flux mode, based on the identified scanning mode, performing the scan with the detector module configured for the mode of the selected imaging protocol, and processing scan data from the scan, generating volumetric image data.

The invention discloses a pulsar photon timing method based on an APD detector. An APD is used for realizing detection on weak pulsar photons of 0.5keV to 10keV. On one hand, the pulsar photon timing method has the advantages of high detection efficiency, rapid response time, high energy resolution and the like; on the other hand, photon-generated carriers in the detector are drifted along a pn junction direction; time jitter caused by the detector is relatively small, so that the pulsar photon timing method is very suitable for pulsar photon timing; a constant-ratio timing and single threshold value triggering method is adopted, so that noises are inhibited, and furthermore, an amplitude movement effect caused by different X photon energy is eliminated; advantages that a GPS (Global Positioning System) second pulse signal is long and stable and an atomic clock is short and stable are combined, and long and stable and high-precision clock frequency is output through a correction principle; TDC (Time-Digital Convert) timing precision is kept; furthermore, pulsar photon timing errors are reduced.

The invention belongs to the technical field of deep space detection and discloses a large-area spiral cylindrical double-sided silicon drift detector and a design method thereof. The design method for the large-area spiral cylindrical double-sided silicon drift detector comprises the following steps of determining electric potentials of the front surface and the rear surface of the silicon driftdetector; calculating an optimal drift path from a point S1 to a point S2 for a carrier during drifting in the silicon drift detector by adopting a mathematical variation method; determining a constant drift electric field of the optimal drift path; and calculating width distribution of a spiral negative electrode of the silicon drift detector. According to the method, through analysis on a carrier drift behavior law and heavily doped electrode growth of the SSD, starting from a new structure, a novel process integration design and a light particle theory calculation method, a double-sided electrode having a double-sided correlation effect and capable of keeping an uniform electron drift electric field and providing a smooth drift trajectory is designed, and an innovative design and manufacturing mode of the efficient collection SDD with high energy resolution of soft X-ray particles with the intensity of 0.5-15keV is established.