84 results about "Proportional counter" patented technology

A neutron spectrometer is disclosed, which consists of a Helium-3 proportional counter connected by cable to signal and data processing circuits, and a series of moderator shells and moderator lids. The series of cylindrical moderator shells are designed to fit within one another, like Russian Matryoshka dolls, with the counter at the center. Small air gaps are introduced between the shells so that removal of one shell from another is facilitated. The counter is placed within the smallest cylindrical moderator shell, and then a circular lid matching the smallest shell is placed on the opening of the first shell to close the first shell. This first closed shell is then placed within a second shell, which shell is closed with its corresponding circular lid. The cable is routed through the series of shells. A method for using the invention is also disclosed, wherein the counter reading is taken from the fully-assembled neutron spectrometer. Then the outer cylindrical shell and circular lid pair is removed, and another measurement of the counter is recorded. This is continued until the last shell is removed, and a measurement is recorded using the bare counter.

The invention provides a device for measuring a coating by using an X-ray fluorescence spectrometer. The device comprises a high voltage generator, an X-ray tube, a collimator, a lens, a camera, a probe, a multi-channel plate and a computer, wherein the high voltage generator is connected with the X-ray tube to provide high voltage for the X-ray tube; the X-ray tube is connected with the collimator; an electric signal is converted into an electric pulse by probing the X ray reflected by a sample with the probe; the electric pulse is amplified by an amplifier MCA; the amplified signal is transmitted to the multi-channel plate; and a communication signal is formed by the multi-channel plate and transmitted to the computer for processing. The method comprises the following steps of: (1) generating the high voltage; (2) mainly converting kinetic energy of electrons into primary radiation in the X-ray tube; (3) using the collimators with different sizes and shapes; (4) receiving the X fluorescence by a probe window; (5) using a proportional counter filled with xenon gas; (6) transmitting the signal of the amplifier into the computer; and (7) displaying data and the image of the sample on a display.

An X-ray fluorescence spectrometer for measuring the concentration of sulfur contained in a sample (S), by irradiating the sample (S) with primary X-rays from an X-ray tube (11), monochromating fluorescent X-rays emitted from the sample (S) with a spectroscopic device, and detecting monochromated fluorescent X-rays with an X-ray detector. The spectrometer includes the X-ray tube (11) having a target with an element including chromium, an X-ray filter (13) disposed on a path of travel of X-rays between the X-ray tube (11) and the sample (S) and having a predetermined transmittance for Cr—Kα line from the X-ray tube (11) and made of a material which is an element of which absorption edges do not exist between energies of S—Kα line and Cr—Kα line, and a proportional counter (18) having a detector gas containing a neon gas or a helium gas.

The invention belongs to the technical field of dosage measurement, and discloses a two-pi multi-wire gas-flow proportional counter. The counter is of a plate-type drawer structure and mainly comprises a counter shell, anode wires, an anode wire frame, insulation frameworks and a source drawer, wherein the counter shell is a square frame composed of an upper cover plate and shell side walls, the source drawer goes into and out of the counter shell through a guide rail, each shell side wall is provided with an air inlet and an air outlet, the anode wire frame is a square frame and is located between the upper insulation framework and the lower insulation framework, the lower insulation framework is fixed to the shell side walls, the upper insulation framework is located below the upper cover plate, the edges of the upper portions of the shell side walls are provided with a sealing ring, the upper cover plate is fixedly connected with the shell side walls, the anode wires are fixed to the anode wire frame, and the anode wires are gold-plated tungsten wires distributed at equal intervals in parallel. The counter has the advantages that the effective detection area is as large as 1000 square centimeters, the anode wires are distributed in parallel, gas disturbance is little, and electric fields are uniformly distributed.

A method and apparatus in accordance with the present disclosure relate to monitoring gain of a proportional counter. The method includes generating a pulse height spectrum of the proportional counter, defining a first window and a second window within the pulse height spectrum, counting electrical pulses outputted by the proportional counter within the first window of the pulse height spectrum, thereby defining a first window count, counting electrical pulses outputted by the proportional counter within the second window of the pulse height spectrum, thereby defining a second window count, and determining a difference between the first window count and the second window count.

A neutron spectrometer is disclosed, which consists of a Helium-3 proportional counter connected by cable to signal and data processing circuits, and a series of moderator shells and moderator lids. The series of cylindrical moderator shells are designed to fit within one another, like Russian Matryoshka dolls, with the counter at the center. Small air gaps are introduced between the shells so that removal of one shell from another is facilitated. The counter is placed within the smallest cylindrical moderator shell, and then a circular lid matching the smallest shell is placed on the opening of the first shell to close the first shell. This first closed shell is then placed within a second shell, which shell is closed with its corresponding circular lid. The cable is routed through the series of shells. A method for using the invention is also disclosed, wherein the counter reading is taken from the fully-assembled neutron spectrometer. Then the outer cylindrical shell and circular lid pair is removed, and another measurement of the counter is recorded. This is continued until the last shell is removed, and a measurement is recorded using the bare counter.

A method and apparatus in accordance with the present disclosure relate to monitoring gain of a proportional counter. The method includes generating a pulse height spectrum of the proportional counter, defining a first window and a second window within the pulse height spectrum, counting electrical pulses outputted by the proportional counter within the first window of the pulse height spectrum, thereby defining a first window count, counting electrical pulses outputted by the proportional counter within the second window of the pulse height spectrum, thereby defining a second window count, and determining a difference between the first window count and the second window count.

The invention relates to a fixed integrated device for monitoring regional gamma neutron radiation. The device comprises a gamma detector, a neutron detector and a host system connected with the gammadetector and the neutron detector through an RS-485 communication network, wherein the host system is connected with a detection signal processing and display system, the gamma detector comprises a plurality of gamma probes, the neutron detector comprises a plurality of neutron probes, the detection signal processing and display system comprises a signal processor connected with the gamma probesand the neutron probes, and the signal processor converts detector signals of the gamma probes and the neutron probes into digital signals. The device is advantaged in that gamma and neutron dose monitoring and dose data management in complex radiation places such as a nuclear reactor are completed by using one dose monitoring system, a GM detector and a 3He proportional counter are selected as main detection instrument probes and are organically combined into a region gamma and neutron detection device, the monitor is beneficial to simplifying equipment complexity of a radiation monitoring system in a nuclear power facility place, and the arrangement space is saved.

The invention relates to a multifilament proportional counter. The multifilament proportional counter is characterized in that an upper cover plate is disposed on a pedestal in a covered manner; a tray support is disposed on the upper part of the pedestal, and is combined with the pedestal; a tray is disposed on the upper part of the tray support, and is connected with the tray support; a cathode bottom plate is fixedly disposed on the upper cover plate; a connecting rod is fixedly disposed on the lower part of the cathode bottom plate; an anode filament rack is disposed on the lower part of the cathode bottom plate, and is hung on the connecting rod; and anode filaments are connected with the anode filament rack by springs. The multifilament proportional counter is advantageous in that the influence of the distance between the radioactive source and the anode filaments on the emissivity of the radioactive source surface and the uncertainty evaluation can be researched quantitatively, and the influence of the air pressure working condition on the beta ray detection can be researched quantitatively; the electric field distribution is stable, and can be used to keep the tray used for carrying the large-area source stable and unshaken, and by adopting the roller-type bearing design, the movable operation of the source tray can be realized.

The present invention discloses a double-barrelled accordance cylindrical flow-gas proportional counter tube. The tube comprises a cylindrical tube body which is internally provided with an upper cavity and a lower cavity, an isolating membrane is configured to separate the upper cavity from the lower cavity, only obstructs [Alpha] particles and does not obstruct [Beta] particles, the isolating membrane is provided with an air vent hole, a sample room is arranged in the lower cavity, and an upper copper cavity and a lower copper cavity are respectively connected with ventilation interfaces; and the cylindrical tube body is earthed, the upper cavity and the lower cavity are internally provided with anode wires, and the upper cavity and the lower cavity respectively output mutually independent pulse signals at the normal work state. The problems are solved that a traditional flow-gas proportional counter tube is high in housing background and bad in resolution ratio, and [Alpha] and [Beta] perform mutual crosstalk when the total [Alpha] activity and the total [Beta] activity are measured at the same time.

A neutron detector module comprising a distribution of proportional counters positioned in a defined array. Each of the proportional counters includes a supply of a neutron sensitive gas for reacting with neutrons, and this reaction generates ionizing reaction products. The proportional counters include a multitude of tubes, and each of the tubes has a diameter between 0.50 inch and 1.00 inch. The neutron detector module comprises further a multitude of electrical conductors; and each of the conductors is positioned in one of the proportional counters, and the ionizing reaction products generate electric current pulses in the electrical conductors.

The invention belongs to the field of nuclear radiation detectors, and particularly relates to a manufacturing process of a closed-gas large-area proportional counter used for measuring alpha and beta radioactive surface contamination. The manufacturing process comprises the following steps: designing the shell of a detector, selecting manufacturing materials, cleaning and passivating the materials, assembling and fixing the shell of the detector, cleaning an incident window, cleaning and fixing anode wires, pasting the incident window, displacing gas, performing sealing, and finally testing all performance indexes. The manufacturing process is simple and feasible and does not need special equipment; the closed-gas large-area proportional counter manufactured through the manufacturing process is still virgin ground in domestic proportional counters; according to the finished closed-gas large-area proportional counter manufactured through the manufacturing process, the plateau length can reach 200V under the plateau slope of 5% per 100V, the efficiency of measuring a 90Sr-90Y beta radioactive source and a 239 Pu alpha radioactive source respectively in the mode of tightly attaching to the surface of the incident window is more than 70% and more than 30% respectively, counting life is not shorter than 1.0E12, and shelf-life is more than one year. Thus, the proportional counter can get rid of the limit on a gas cylinder and on the gas circuit facilities of the gas cylinder when used in the alpha and beta radioactive surface contamination; besides, from the point of view of technology and use, a closed-gas proportional detector has the advantages of both a solid state detector and a gas-flow proportional detector.

An X-ray fluorescence spectrometer for measuring the concentration of sulfur contained in a sample (S), by irradiating the sample (S) with primary X-rays from an X-ray tube (11), monochromating fluorescent X-rays emitted from the sample (S) with a spectroscopic device, and detecting monochromated fluorescent X-rays with an X-ray detector. The spectrometer includes the X-ray tube (11) having a target with an element including chromium, an X-ray filter (13) disposed on a path of travel of X-rays between the X-ray tube (11) and the sample (S) and having a predetermined transmittance for Cr—Kα line from the X-ray tube (11) and made of a material which is an element of which absorption edges do not exist between energies of S—Kα line and Cr—Kα line, and a proportional counter (18) having a detector gas containing a neon gas or a helium gas.