18 results about "Proportional counter" patented technology

The invention relates to the technical field of radiation detection, and discloses a double-wire proportional counter tube and a signal processing method thereof. The double-wire proportional counter tube comprises a cavity made of TU2 oxygen-free copper, two 50 [mu] m gold-plated tungsten wires are arranged in the cavity in parallel to serve as anode wires, the distance between the wires is 1.8 cm, and the anode wires are led out through ceramic insulation terminals. And P10 gas is filled in the cavity. And the signal processing module comprises a pre-amplification circuit, a coincidence circuit, a main amplification circuit and a data acquisition unit, and is used for carrying out coincidence processing on the two paths of anode signals and screening effective signals. The signal processing method comprises the steps of gas ionization, electron avalanche amplification and signal synchronous judgment and recording. The ray measuring device integrates the counting tube, a gas path system and a data acquisition system, background noise is reduced through a coincidence circuit, and an energy spectrum analysis module can be selected to distinguish alpha rays and beta rays. The invention has the advantages of simple structure, high sensitivity, low background noise and the like.

The invention provides an inflation system of helium-3 proportional counter tubes. The inflation system comprises a plurality of helium-3 proportional counter tubes, a detection device, a vacuum device, a mixing device and a gas supply device, the whole system is vacuumized through the vacuum device, a preset proportion of gas provided by the gas supply device is input into the mixing device to be evenly mixed, then the evenly-mixed gas is input into the helium-3 proportional counter tube through the mixing device, and in the process of inflating the helium-3 proportional counter tube, the gas is filled into the helium-3 proportional counter tube. And rechecking the proportion of the gas filled into the helium-3 proportional counter tube through a detection device. According to the system, high-efficiency gas distribution is realized, the accuracy of the multi-element gas configuration proportion is improved, and reinspection is supported.

The present invention relates to a method for generating an analog spectrum of a tissue equivalent proportional counter and its application. By collecting the data measured by tissue equivalent proportional counters in the environments of the International Space Station, monoenergetic particles, γ fields, and neutron fields published at home and abroad, and processing the collected data to form a basic spectrum, an analog spectrum that satisfies the measurement distribution law of tissue equivalent proportional counters in the above different radiation fields is generated on the basis of the basic spectrum, and the quality factor Q, absorbed dose D, and dose equivalent H values are obtained from this spectrum, which can be applied to calibrating the hardware measurement system and signal processing module of the tissue equivalent proportional counter. The tissue equivalent proportional counter calibration method disclosed by the present invention has the advantages of high calibration efficiency, real-time calibration, and wide application range.

The utility model discloses a device for leading out a cathode nuclear signal of a proportional counter tube, and belongs to the technical field of nuclear detection. In order to solve the technical problem that the measurement precision is influenced by signal distortion easily caused by leading out nuclear signals from the anode of the existing proportional counter tube, the utility model mainly adopts a mode of leading out nuclear signals from the cathode of the proportional counter tube, and is provided with a first signal joint, a second signal joint, a third signal joint and a metal shielding shell in a matched manner. According to the utility model, complete output and electromagnetic interference suppression of nuclear signals can be realized, and signal quality and device stability are improved.

The invention provides a wide-energy-spectrum neutron dose rate meter, and the meter comprises a mechanical structure assembly which comprises a proportional counter tube, a neutron moderator layer, and a neutron multiplier layer; wherein the neutron moderator layer wraps the proportional counter tube, and the neutron multiplier layer is arranged between the neutron moderator layer and the proportional counter tube; and the circuit board is used for providing working voltage for the proportional counter tube and processing a detection signal output by the proportional counter tube.

The invention is suitable for the field of radiation detection, and provides a neutron detector. Comprising a proportional counter tube, a signal amplifying and shaping module connected with the signal output end of the proportional counter tube, a first pulse counting module connected with the signal amplifying and shaping module, a signal integral quantization module connected with the ground signal output end of the proportional counter tube, and a second pulse counting module connected with the signal integral quantization module, the processor is respectively connected with the first pulse counting module and the second pulse counting module, and the prompting module, the storage module and the communication module are respectively connected with the processor. According to the invention, the effect of zoning measurement of 2nSv / h-1000mSv / h is realized, the linearity of full-range measurement is ensured by the zoning measurement technology, and the neutron dose with a relatively wide range is measured by one proportional counter tube.

The invention relates to the field of nuclear radiation measurement, in particular to a proportional counter tube and a particle measurement method based on the proportional counter tube, the proportional counter tube comprises a shell, a shielding body and a cathode part, the shielding body is arranged in the shell, the cathode part is arranged in the shielding body, and the cathode part is electrically connected with the shell to serve as a cathode of the proportional counter tube; the shielding body is additionally arranged between the shell and the cathode part to construct a physical barrier, so that secondary electrons generated by interaction of gamma rays and the shell can be effectively blocked or isolated from entering an effective working area of the counting tube, interference signals formed by the part of electrons are inhibited, and the safety of the counting tube is improved. And the detector can still clearly distinguish the real signal of the particle to be detected in a high gamma environment.

The application discloses a micro-network type tissue equivalent proportional counter, and relates to the field of radiation measurement. The counter comprises a cathode part, a micro-network electrode, a collector and an anode plate which are sequentially stacked from top to bottom. The cathode part comprises a cathode and an insulating ring. The cathode is a cylinder with a sealed upper surface. The inner side of the cathode is coaxially provided with the insulating ring. The outer wall of the insulating ring is attached to the inner wall of the cathode. The column on the inner side of the insulating ring forms a sensitive space. The micro-network electrode is a circular mesh electrode. The annular lower surface of the cathode is connected to the micro-network electrode through insulating material. The micro-network electrode and the collector have a set interval. The micro-network electrode and the collector are connected through insulating material. The cross section of the insulating material between the micro-network electrode and the collector is annular and coaxial with the lower surface of the cathode. The collector is a conductive electrode on the anode plate. The sensitive space is used to fill tissue equivalent gas. The application reduces the manufacturing cost, improves the performance of the counter and the structural stability.

The invention relates to the technical field of nuclear reactor safety monitoring, and provides a helium-3 proportional counter tube assembly and a monitoring system.The helium-3 proportional counter tube assembly comprises a shell, the top end of the shell is fixedly connected with a support, the top of the support is fixedly connected with a top cover through bolts, and the inner side of the top cover is fixedly connected with a water sealing connector used for sealing a cable; one end of the inner side of the support is fixedly connected with a front discharge circuit board, the inner side of the shell is fixedly connected with a helium-proportional counter tube, a helium-3 proportional counter tube is electrically connected with the front discharge circuit board, a cable pressing block is arranged between the outer wall of the helium-3 proportional counter tube and the inner wall of the shell, and the bottom end of the shell is fixedly connected with a lead counterweight filler layer. The pre-amplification circuit board is directly integrated on the inner side of the support and is close to the helium-3 proportional counter tube, in-situ signal amplification processing is achieved, noise introduction of long-distance transmission is avoided, the problem that long-distance transmission of weak charge signals of a detector is prone to being interfered is solved, and integrity and accuracy of neutron pulse signals are ensured.

The application relates to the technical field of radioactivity measurement, and provides a processing method of a proportional counter, which comprises the following steps: introducing standard tritium gas into the proportional counter to obtain a target pulse signal of the standard tritium gas; obtaining a first charge integral, a second charge integral and a target shape discrimination factor according to the target pulse signal; and obtaining a discrimination line according to the first charge integral and the target shape discrimination factor, wherein the target shape discrimination factor is located below the discrimination line. The processing method of the proportional counter can reduce the background count rate in the proportional counter.

Disclosed herein are devices, systems, and methods for tritium gas detection. For example, disclosed herein are proportional counter-gas ionization devices for tritium gas detection, the devices comprising a fluid cell comprising a wall defining a chamber, a cathode, an anode, and a hydrogen sorption layer. The hydrogen sorption layer comprises a metal that forms a metal hydride when hydrogen is absorbed and / or adsorbed. The hydrogen sorption layer coals the wall within the chamber. When the hydrogen sorption layer is heated after absorbing and / or adsorbing hydrogen, the metal hydride is configured to release the absorbed and / or adsorbed hydrogen into the chamber. When the cathode and the anode are conductively coupled to a voltage source, the voltage source is configured to apply a voltage to the cathode and the anode to thereby operate the device as a proportional counter-gas ionization device for tritium gas detection.

The invention discloses a device and a method for measuring ultra-trace tritium in a small-volume helium-3 gas sample. The device comprises a filter cartridge, a P10 gas cylinder, a proportional counter, a pre-amplifier and a main amplifier, the P10 gas cylinder is connected with the filter box through a pipeline, and a first valve is arranged on the connecting pipeline; the filter box is connected with a flowmeter through a pipeline, and a pressure gauge is connected to the connecting pipeline; the flowmeter is connected with a proportional counter through a pipeline, and a second valve and a needle tube type gas sampler are arranged on the connecting pipeline; the proportional counter is connected with the pre-amplifier; the preamplifier applies high voltage to the proportional counter, reads and amplifies an electric signal of the proportional counter, the preamplifier is connected with the main amplifier, the main amplifier is connected with the multichannel analyzer, the multichannel analyzer is connected with the spectrum analysis software system, and the electric signal is recorded as an energy spectrum diagram in the spectrum analysis software system through the main amplifier and the multichannel analyzer. The method has the advantages of low sample consumption and low enough detection lower limit level.

The invention discloses a wide-range integrated out-of-pile neutron detector, which adopts a coaxial multi-pole plate structure, realizes working area separation through a common electrode, and outputs a pulse signal and a current signal at the same time. Wherein the coaxial multi-pole plate structure is a coaxial multi-pole plate structure with three layers of electrode tubes additionally arranged on a central anode wire, the three layers of electrode tubes are a tube I, a tube II and a tube III in sequence from inside to outside, a pulse signal is led out by the central anode wire, and a current signal is led out by the tube II. The inner wall of the tube I and the inner wall of the tube III are coated with neutron sensitive materials; working gas suitable for the proportional counter tube is filled in the tube I, and same working gas suitable for compensating the ionization chamber is filled between the tube I and the tube II and between the tube II and the tube III. The central anode wire is connected with positive high voltage, the tube I is connected with negative high voltage, the tube II is grounded, and the tube III is connected with the positive high voltage. On the premise that the size of the detector body is not enlarged, wide-range neutron fluence rate measurement is achieved.

A neutron proportional counter is provided. The proportional counter may include a chamber and a gas mixture. The chamber includes an anode and a cathode. The gas mixture is contained within the chamber and includes at least one neutron-sensitive fill gas and a quench gas including BF3. In certain embodiments, the neutron-sensitive fill gas may be configured to detect thermal neutrons (e.g., He-3), fast neutrons (e.g., He-4, H2), or both (e.g., UF6).

The invention discloses a gamma-ray compensation type recoil proton proportional counter for fast neutron detection, and belongs to the technical field of neutron detection, the gamma-ray compensation type recoil proton proportional counter comprises a cylindrical shell, an insulator is arranged in the cylindrical shell along the cross section direction of the cylindrical shell, and the insulator divides the interior of the cylindrical shell into a neutron measurement cavity and a gamma-ray measurement cavity; cathode tubes and anodes are arranged in the neutron measurement cavity and the gamma-ray measurement cavity, field tubes are installed at the two ends of each cathode tube, the anodes in the neutron measurement cavity are electrically connected with the electronics system, and the cathode tubes and the field tubes of the neutron measurement cavity and the gamma-ray measurement cavity are connected through wires penetrating through the insulator. Hydrogen-containing gas is arranged in the neutron measurement cavity, and equivalent gas is arranged in the gamma ray measurement cavity. The influence of gamma rays during measurement of fast neutrons in a low-energy region is suppressed or reduced through the gamma ray compensation system, the energy measurement lower limit of the recoil proton proportional counter is expanded, and absolute measurement of the single-energy neutron fluence rate in the 10-100 keV energy region can be achieved.

The invention relates to the technical field of radiation detection, and provides a 2pi proportional counter which comprises an ionization cavity and an anode net, and one side wall of the ionization cavity in a first direction is a cathode plate; the anode net is arranged in the ionization cavity, and the anode net and the cathode plate are spaced in the first direction; the anode net comprises a plurality of anode wires, the anode wires extend in the second direction, the anode wires are arranged at intervals in the third direction, the anode wires are fixed into the ionization cavity after being pre-stretched, and the first direction, the second direction and the third direction are perpendicular to one another. The anode wire is fixed in a stretched state, the anode wire keeps tension, when the anode wire is in the stretched state, internal crystal lattices of the anode wire distort, the yield strength and the tensile strength can be remarkably improved, the internal stress of the anode wire in the stretched state can offset part of electric field force, and therefore the capacity of resisting electric field induced deformation is enhanced; bending deformation caused by an electric field can be restrained, and stability is improved.

This invention relates to a particle beam energy monitoring device and method. The device includes a tissue equivalent proportional counter, a data acquisition module, and a processing module. The tissue equivalent proportional counter is connected to the data acquisition module, and the processing module is connected to the data acquisition module. The tissue equivalent proportional counter is used to receive irradiation from a particle beam and generate an ionization signal under the irradiation of the particle beam. The data acquisition module is used to acquire the ionization signal output by the tissue equivalent proportional counter and obtain the pulse amplitude spectrum of the particle beam based on the ionization signal. The processing module is used to determine the energy of the particle beam in real time based on the pulse amplitude spectrum of the particle beam.

This invention discloses a neutron measurement device using a helium-4 proportional counter tube, comprising: a helium-4 proportional counter tube, a proportional counter tube with helium-4 as the main gas and an internal gas pressure greater than or equal to 1 MPa, serving as a neutron detector and used to generate ionized particles; a neutron moderation collimator, enclosing the helium-4 proportional counter tube, used to scatter and moderate neutrons generated by its line-of-sight nuclear fusion device to achieve a collimation effect; an amplifier, used to amplify the output signal of the helium-4 proportional counter tube; a pulse height analyzer, used to receive the amplified output signal and output a pulse height spectrum; and a calculation module, used to receive the pulse height spectrum and fit the pulse height spectrum based on predetermined deuterium-deuterium neutron response energy spectra and deuterium-tritium neutron response energy spectra to obtain the ratio of the proportion of deuterium-deuterium neutrons to the proportion of deuterium-tritium neutrons in the output of the pulse height analyzer, and to calculate the ratio of deuterium-deuterium neutrons to deuterium-tritium neutrons. This invention does not rely on a photomultiplier tube, and the device is not easily affected by interference.