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33 results about "Gamma ray spectrometer" patented technology

A gamma-ray spectrometer (GRS) is an instrument for measuring the distribution (or spectrum—see figure) of the intensity of gamma radiation versus the energy of each photon. The study and analysis of gamma-ray spectra for scientific and technical use is called gamma spectroscopy, and gamma-ray spectrometers are the instruments which observe and collect such data. Because the energy of each photon of EM radiation is proportional to its frequency, gamma rays have sufficient energy that they are typically observed by counting individual photons.

Isotopic response with small scintillator based gamma-ray spectrometers

The intrinsic background of a gamma ray spectrometer is significantly reduced by surrounding the scintillator with a second scintillator. This second (external) scintillator surrounds the first scintillator and has an opening of approximately the same diameter as the smaller central scintillator in the forward direction. The second scintillator is selected to have a higher atomic number, and thus has a larger probability for a Compton scattering interaction than within the inner region. Scattering events that are essentially simultaneous in coincidence to the first and second scintillators, from an electronics perspective, are precluded electronically from the data stream. Thus, only gamma-rays that are wholly contained in the smaller central scintillator are used for analytic purposes.
Owner:LAWRENCE LIVERMORE NAT SECURITY LLC

Fracture-resistant lanthanide scintillators

Lanthanide halide alloys have recently enabled scintillating gamma ray spectrometers comparable to room temperature semiconductors (<3% FWHM energy resolutions at 662 keV). However brittle fracture of these materials upon cooling hinders the growth of large volume crystals. Efforts to improve the strength through non-lanthanide alloy substitution, while preserving scintillation, have been demonstrated. Isovalent alloys having nominal compositions of comprising Al, Ga, Sc, Y, and In dopants as well as aliovalent alloys comprising Ca, Sr, Zr, Hf, Zn, and Pb dopants were prepared. All of these alloys exhibit bright fluorescence under UV excitation, with varying shifts in the spectral peaks and intensities relative to pure CeBr3. Further, these alloys scintillate when coupled to a photomultiplier tube (PMT) and exposed to 137Cs gamma rays.
Owner:SANDIA NAT LAB

Method and system for measuring neutron emissions and ionizing radiation, solid state detector for use therein, and imaging system and array of such detectors for use therein

A method and system for measuring neutron emissions and ionizing radiation, such as gamma emissions, solid state detector for use therein, and imaging system and array of such detectors for use therein are provided using Cd- and / or Hg-containing semiconductors or B-based, Li-based or Gd-based semiconductors. The resulting systems and detectors used therein may be not only compact and portable, but also capable of operating at room temperature. The detectors may also be operable as gamma ray spectrometers.
Owner:RGT UNIV OF MICHIGAN

gamma ray imaging spectrometer

The invention provides a spectrometer for gamma ray imaging, which consists of a uniform redundant array encoding board, a detection module, a front-end signal processing module, an A / D module, a control module, a data interface module, a power supply module, and a lead shielding layer composition. In the lead shielding layer, the uniform redundant array coding board is placed at the front of the detection module; the detection module is connected to the front-end signal processing module through a cable; the A / D module is connected to the front-end signal processing module, and then connected to the control module through a double row of pins The control module is connected to the data interface module through the cable socket; the data interface module is output to the upper PC through Ethernet; the power module processes the input low-voltage DC power of the system and supplies it to each module respectively. The gamma-ray imaging energy spectrometer provided by the invention can be used for both gamma-ray imaging and gamma-ray energy spectrum measurement.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS

Gamma ray spectrometers

A gamma ray detector (50) comprises a plastic scintillation body (52) arranged to receive incident gamma rays to be detected. Photons are generated in response to the gamma rays by excitation and de-excitation processes in the scintillation body. The photons are detected using at least one photodetector (56) which generates an output signal representative of the energy of the gamma rays. The scintillation body has a detection surface to receive the gamma rays and a thickness in a direction substantially orthogonal to the detection surface that is not greater than 5 cm. Deconvolution techniques can be used to improve the output signal; the thinness of the scintillation body allows sufficiently accurate results to be obtained that individual isotopes can be readily identified. The detector can be usefully employed in portal radiation monitors.
Owner:SYMETRICA

Gamma-Ray Spectrometry

A calibration source for a gamma-ray spectrometer is provided. The calibration source comprises a scintillator body having a cavity in which a radioactive material is received. The scintillator body may be generally cuboid and the cavity may be formed by a hole drilled into the scintillator body. The radioactive material comprises a radioactive isotope having a decay transition associated with emission of a radiation particle and a gamma-ray having a known energy e.g. Na-22. A photodetector, for example a silicon photomultiplier, is optically coupled to the scintillator body and arranged to detect scintillation photons generated when radiation particles emitted from the radioactive material interact with the surrounding scintillator bod. A gating circuit is arranged to receive detection signals from the photodetector and to generate corresponding gating signals for a data acquisition circuit of an associated gamma-ray spectrometer to indicate that gamma-ray detections in the gamma-ray spectrometer occurring within a time window defined by the gating signal are associated with a decay transition in the radioactive isotope. Thus a calibration source is provided based around a simple scintillator body design. Furthermore, the radioactive material may be introduced into the scintillator body in a separate step after manufacture of the scintillator body, thereby reducing the risk of radioactive contamination during manufacture.
Owner:SYMETRICA

Isotopic response with small scintillator based gamma-ray spectrometers

The intrinsic background of a gamma ray spectrometer is significantly reduced by surrounding the scintillator with a second scintillator. This second (external) scintillator surrounds the first scintillator and has an opening of approximately the same diameter as the smaller central scintillator in the forward direction. The second scintillator is selected to have a higher atomic number, and thus has a larger probability for a Compton scattering interaction than within the inner region. Scattering events that are essentially simultaneous in coincidence to the first and second scintillators, from an electronics perspective, are precluded electronically from the data stream. Thus, only gamma-rays that are wholly contained in the smaller central scintillator are used for analytic purposes.
Owner:LAWRENCE LIVERMORE NAT SECURITY LLC

Air kerma conventional true value measuring method

A measurement method for an air kerma conventional true value comprises: building a small-scale reference radiation field, then selecting a proper radiation source (4) and a source intensity for providing incident rays for a shielding box (1), subsequently selecting a plurality of gamma ray dose measurement instruments as experiment samples for building a prediction model to obtain a prediction model of the air kerma conventional true value of a check point, fmally placing a probe of an instrument to be detected on the check point (6), recording a scattering gamma spectrum detected by a gamma-ray spectrometer (9), and importing the prediction model to obtain the air kerma conventional true value. The method relates to the field of radiation protection detection or calibration, and has the beneficial effects that the result is accurate, the reference radiation field used is small in size, and the method is applied to measurement of the air kerma conventional true value. The method solves the problem that site and in-situ detection or calibration is unlikely to be implemented as the existing standard reference radiation field is too large in space and volume to move or is difficult to move.
Owner:INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF

Gamma-Ray Spectrometer

An apparatus is described. The apparatus comprising a gamma-ray spectrometer arranged to receive gamma-rays from a calibration source, the gamma-ray spectrometer comprising: a scintillator material optically coupled to two or more photomultipliers, the two or more photomultipliers being arranged to detect photons generated in the scintillator material associated with gamma-ray interactions between the scintillator material and gamma-rays received from the calibration source, wherein the two or more photomultipliers are operable to output respective detection signals associated with the gamma-ray interactions; the apparatus further comprising: a switch coupled to receive the respective detection signals from the two or more photomultipliers and operable to select detection signals from one of the two or more photomultipliers; and a stabilization circuit coupled to the switch and operable to receive the selected detection signal of the respective photomultiplier and to stabilize the gain of the photomultiplier that output the selected detection signal based on the detection signals.
Owner:SYMETRICA

Gamma ray spectroscopy monitoring method and apparatus

The present invention relates generally to the field of gamma ray spectroscopy monitoring and a system for accomplishing same to monitor one or more aspects of various isotope production processes. In one embodiment, the present invention relates to a monitoring system, and method of utilizing same, for monitoring one or more aspects of an isotope production process where the monitoring system comprises: (A) at least one sample cell; (B) at least one measuring port; (C) at least one adjustable collimator device; (D) at least one shutter; and (E) at least one high resolution gamma ray spectrometer.
Owner:BABCOCK & WILCOX TECHNICALSERVICES GRP INC

Neutron detector attachment device

An auxiliary neutron detector apparatus designed for attaching and supplementation to an existing gamma-ray spectrometer adds improved neutron detection capabilities. The apparatus uses the existing detector and so does not require additional detector materials, including 3He, which are required by conventional neutron detector attachments. Because of the cost and limited availability of detector materials, this invention is particularly valuable for upgrading systems without existing neutron detector, and for repairing systems with damaged neutron detectors.
Owner:PRINCETON GAMMA TECH INSTR

Handheld dual thermal neutron detector and gamma-ray spectrometer

A combined thermal neutron detector and gamma-ray spectrometer system, including: a first detection medium including a lithium chalcopyrite crystal operable for detecting neutrons; a gamma ray shielding material disposed adjacent to the first detection medium; a second detection medium including one of a doped metal halide, an elpasolite, and a high Z semiconductor scintillator crystal operable for detecting gamma rays; a neutron shielding material disposed adjacent to the second detection medium; and a photodetector coupled to the second detection medium also operable for detecting the gamma rays; wherein the first detection medium and the second detection medium do not overlap in an orthogonal plane to a radiation flux. Optionally, the first detection medium includes a 6LiInSe2 crystal. Optionally, the second detection medium includes a SrI2(Eu) scintillation crystal.
Owner:CONSOLIDATED NUCLEAR SECURITY +1

Additively Manufactured Component Including a Contrast Agent for Part Identification

A system and method for additively manufacturing a component including features for part identification are provided. The method includes selectively depositing a contrast agent on a cross sectional layer to define a component identifier of the component and directing energy from an energy source onto the contrast agent to fuse the contrast agent and the cross sectional layer. The contrast agent may be an x-ray emission contrast agent that is read using an x-ray emission spectroscopy method, an infrared contrast agent that is read using an infrared camera or an infrared scanner, or a radioactive contrast agent that is read using a gamma ray spectrometer.
Owner:GENERAL ELECTRIC CO

Scintillating gamma ray spectrometer and its use in mud logging system

A gamma ray scintillation spectrometer is disclosed in which an inorganic scintillation crystal has a channel extending therethrough for receiving a sample into, and disposing a sample out of, the scintillation crystal. The spectrometer further includes a photomultiplier tube optically coupled to the scintillation crystal to detect photons generated by the scintillation crystal. A system and a method for using the gamma ray scintillation spectrometer are also provided.
Owner:SHELL OIL CO

Large-sized artificial nuclide plane source calibration device and gamma ray spectrometer calibration method thereof

The invention provides a large-sized artificial nuclide plane source calibration device and an optimized calibration method for calibrating a machine-mounted / vehicle-mounted gamma ray spectrometer byusing the device. In the device, the design that eight isosceles trapezoids are combined to form a regular hexagon plane source realizes the conversion of a limited plane source into an unlimited (saturated) plane source through gapless joint; a rigid supporting plate structure ensures the planarity of the plane source; the uniform mesh distribution on filter paper and the use of quantitative liquid filler for filling raw liquid ensure the design activity of the plane source and the uniformity of activity distribution; the sealing of the plane source by adhesive resin ensures that source spotsare free from damages and the long-term stability of the activity of the plane source; and the establishment of an angle response model provides a feasible technical evidence for the reduction of detection workload in a follow-up detection process, and the calibration method can be used to calculate a calibration factor when no obvious change occurs in the angle response model.
Owner:核工业航测遥感中心

High-purity germanium gamma ray spectrometer with wide-energy anti-compton electric refrigeration

The invention discloses a high-purity germanium gamma ray spectrometer with wide-energy anti-compton electric refrigeration, which comprises a bottom plate I. A supporting plate I is arranged above the bottom plate I. The top of the supporting plate I is provided with a locking mechanism. The top of the locking mechanism is provided with a refrigerating device. The inside of the refrigerating device is provided with a detector. The top of the refrigerating device is provided with a lead chamber. The middle position of the top end of the bottom plate I is provided with a mounting plate I. The middle position of the bottom of the supporting plate I is provided with a mounting plate II. One side of the mounting plate I is provided with a spectrum analysis device. The top end of the mounting plate I is provided with two sets of fixing blocks I. The inside of each fixing block I is provided with a semi-tooth gear I. Each semi-tooth gear I is connected with one end of a connecting rod I. Theother end of each connecting rod I is provided with a movable block. The upper end of each movable block is provided with a second connecting rod II. The upper end of each connecting rod II is provided with a semi-tooth gear II. The high-purity germanium gamma ray spectrometer with the wide-energy anti-compton electric refrigeration has the beneficial effects that the height of the support plateII can be adjusted according to the height of a worker, so that the worker can conveniently adjust and replace the refrigerating device.
Owner:嘉善美源服饰水洗有限公司

Preparation and detection efficiency correcting method for <133>Xe simulated gas source

The invention belongs to the technical field of radioactive gas sources, and relates to a preparation and detection efficiency correcting method for a <133>Xe simulated gas source. The preparation anddetection efficiency correcting method comprises the following steps that (1) a trace of resin glue containing vinyl alcohol molecules is added on the surface of each EPS particle, and 1[mu]l <133>Baradioactive standard solution is dropped; (2) the EPS particles obtained in the step (1) are dried and evenly mixed and then put into a simulation source box to make a <133>Ba simulation source; (3)the gamma-peak count of the <133>Ba simulation source prepared in the step (2) is measured through a gamma-ray spectrometer, and the detection efficiency of <133>Ba is obtained through calculation; (4) a <133> Xe gas source is prepared; (5) the gamma-peak count of the <133>Xe gas source prepared in the step (4) is measured through the gamma-ray spectrometer, and the detection efficiency of <133>Xeis obtained through calculation; and (6) the efficiency transmission factor of the <133>Ba simulation source is calculated according to the detection efficiency calculation results of the step (3) and the step (5). Through the preparation and detection efficiency correcting method, the detection efficiency calibration for gamma-ray spectrometer measurement of the <133>Xe can be simulated, the calibration is more accurate, and deviation is obviously smaller.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY

Method and system for detecting accuracy of gamma ray spectrometer

The invention relates to a method and a system for detecting the accuracy of a gamma ray spectrometer. The method comprises the following steps of exploring test samples under the scheduled test environment by utilizing the gamma ray spectrometer to obtain exploration data; analyzing the content of elements explored by the gamma ray spectrometer from the test samples according to the obtained exploration data; and comparing the content of the elements with the standard value of the content of the elements in the test samples and judging whether the gamma ray spectrometer has the element exploration capability or not according to the comparison result. The system comprises the gamma ray spectrometer, a data acquisition device, a data analysis device, a comparison device and a display device. The method and the system of the invention can acquire the capability for exploring the elements before the gamma ray spectrometer is used for the fields of lunar exploration and the like so as to guarantee the accuracy of the data when the gamma ray spectrometer is used.
Owner:撼地数智(重庆)科技有限公司

Airborne radioactivity survey system

The present invention relates to an aerial radioactive survey system, including a drone, a gamma spectrometer, an airborne host, an airborne Beidou satellite module, a Beidou satellite ground monitoring station, a backup server, a main server, a database, a data interface, and a plan view Generation module, stereogram generation module, printing equipment, described gamma energy spectrometer, airborne host computer, airborne Beidou satellite module are arranged in unmanned aerial vehicle, described airborne Beidou satellite module passes Beidou satellite and Beidou satellite ground monitoring station For data transmission, the Beidou satellite ground monitoring station transmits data to the router through the Internet, and the main server is respectively connected to the data interface, the planar image generation module, the stereoscopic image generation module, and the printing device. The invention has a wide range of applications and can be widely used in aviation radioactivity surveys in the fields of resources and environment, radiation environment investigation and evaluation, nuclear emergency aviation radioactivity monitoring, radioactive geological surveys and geological mapping.
Owner:CHENGDU NEWRAY TECH CO LTD

Electron and gamma ray spectrometer based on gradient magnetic field

The invention discloses an electron and gamma ray spectrometer based on a gradient magnetic field. The electron and gamma ray spectrometer comprises a conversion target, a shielding part, a spectrometer main body part and a detector. By adopting the gradient magnetic field, the convergence points of deflection tracks of electrons with different energies are almost on the same straight line. And the detector is inserted into the spectrometer main body part along the straight line, and is used for collecting positive and negative electron signals generated after electrons or gamma rays pass through the conversion target, so that high-resolution detection is realized. The electron and gamma ray spectrometer has the characteristics of online detection, high resolution, large dynamic range and flexibility in use.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

A high-purity germanium gamma spectrometer device with wide-energy anti-kang electric refrigeration

The invention discloses a high-purity germanium gamma ray spectrometer with wide-energy anti-compton electric refrigeration, which comprises a bottom plate I. A supporting plate I is arranged above the bottom plate I. The top of the supporting plate I is provided with a locking mechanism. The top of the locking mechanism is provided with a refrigerating device. The inside of the refrigerating device is provided with a detector. The top of the refrigerating device is provided with a lead chamber. The middle position of the top end of the bottom plate I is provided with a mounting plate I. The middle position of the bottom of the supporting plate I is provided with a mounting plate II. One side of the mounting plate I is provided with a spectrum analysis device. The top end of the mounting plate I is provided with two sets of fixing blocks I. The inside of each fixing block I is provided with a semi-tooth gear I. Each semi-tooth gear I is connected with one end of a connecting rod I. Theother end of each connecting rod I is provided with a movable block. The upper end of each movable block is provided with a second connecting rod II. The upper end of each connecting rod II is provided with a semi-tooth gear II. The high-purity germanium gamma ray spectrometer with the wide-energy anti-compton electric refrigeration has the beneficial effects that the height of the support plateII can be adjusted according to the height of a worker, so that the worker can conveniently adjust and replace the refrigerating device.
Owner:嘉善美源服饰水洗有限公司

Gamma-ray spectrometer

A gamma-ray spectrometer comprising a scintillation body (34) for receiving gamma-rays and generating photons therefrom and a photodetector for detecting photons from the scintillation body and generating a corresponding output signal is described. The photodetector comprises a photocathode (26), an anode (28), and a reflecting surface (28A). The photocathode is arranged to receive photons from the source and generate photo-electrons therefrom. The anode is arranged to receive photoelectrons generated at the photocathode and is coupled to a detection circuit / amplifier configured to generate an output signal indicative of the photoelectrons received at the anode. The reflecting surface is arranged so as to reflect photons which have passed through the photocathode without interaction back towards the photocathode to provide the photons with another opportunity to interact with the photocathode, thus enhancing the overall effective quantum efficiency of the detector. The reflector may be specular or diffuse.
Owner:SYMETRICA
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