150 results about "Ionization chamber" patented technology

The invention relates to the technical field of radiation monitoring, in particular to a radioactive foam height nuclear monitoring system and a use method. A radioactive foam height nuclear monitoring system comprises an ionization chamber detector; the collimation shielding module is provided with a containing space, the ionization chamber detector is contained in the containing space, the collimation shielding module is provided with a collimation hole, and particles generated by the self-radiation source can pass through the collimation hole. The invention provides a radioactive foam height nuclear monitoring system and a use method, and aims to solve the problem that a conventional radiation detector is difficult to bear an extremely high radiation environment and affects the detection precision.

The invention relates to the technical field of ionization radiation detection, in particular to an ionization chamber detection device, a measurement system and a use method. An ionization chamber detection device comprises: a housing having an accommodation space in which a mixed reaction gas is accommodated; the at least one separating polar plate is arranged in the accommodating space, and the separating polar plate is used for separating the accommodating space into at least two sections of detection cavities; the at least two signal collecting polar plates are respectively arranged in different detection chambers; and the at least two signal transmission lines are respectively connected with different signal collecting polar plates, one end of each signal transmission line is connected with the signal collecting polar plate, and the other end of each signal transmission line extends out of the shell and is suitable for being connected with a data collecting and processing unit. The invention provides an ionization chamber detection device, a measurement system and a use method, and aims to solve the problem that a conventional ionization chamber is generally used for intensity and dose measurement of regional radiation and is not suitable for position sensitive detection of a space smaller than the sensitive volume of the ionization chamber.

The invention relates to a method for testing the tritium release rate of a tritium-containing waste package, and the method comprises the steps: guiding tritium-containing waste gas released by the tritium-containing waste package in an exhaust hood to be continuously input into an ionization chamber online monitoring system, and determining the initial tritium activity concentration; when the first threshold value is lower than the first threshold value, the tritium-containing waste gas flows into an initial bubbling sampler after passing through a refrigerating system to collect tritiated water, and target gas is obtained; enabling the target gas to circularly pass through the operation of the initial bubbling sampler, and replacing a new bubbling sampler every time a first preset time is reached; after a second preset time is reached, stopping the cyclic operation, and testing the target tritium activity concentration of liquid in the bubbling sampler which is replaced for multiple times and the current bubbling sampler by adopting a liquid scintillation counter; and calculating the tritium release rate based on the target tritium activity concentration. Target gas is discharged into the exhaust hood again, tritiated water absorption is carried out on tritium-containing waste gas multiple times, and the technical effects that tritiated water absorption is more complete due to multiple times of cyclic absorption, and the tritium release rate detection result is more accurate are achieved.

The utility model relates to the technical field of micropore aperture measurement and metering, and discloses a testing device for measuring the aperture of an ultra-small micropore, which comprises a sealed box body, a measuring space for measuring the aperture of the ultra-small micropore is arranged in the sealed box body, and a vertically arranged partition plate is arranged in the measuring space. The partition plate divides the measuring space into a positive ionization chamber and a negative ionization chamber, a clamp used for clamping a measured object is arranged in the middle of the partition plate, and the positive ionization chamber and the negative ionization chamber are located on the two sides of the measured object respectively and apply positive and negative charges to the measured object. The two sides of the sealed box body are respectively provided with an electric wire extending to the corresponding positive ionization chamber and negative ionization chamber, and the electric wires are electrically connected with a charge sensor used for measuring the directional flow charge quantity of the measured object. According to the utility model, an accurate and reliable measurement result can be obtained for an ultra-microporous object to be measured, and important data support is provided for the aspects of medicine packaging material sealing positive samples, material performance evaluation, filtering effect optimization and the like.

The application provides a self-cooling air-breathing radio frequency plasma electric thruster, which comprises an air inlet channel, an ionization chamber and a nozzle, the air inlet channel is divided into a main air inlet channel and a secondary air inlet channel, the main air inlet channel is communicated with the ionization chamber, a cooling flow channel is arranged on the periphery of the ionization chamber, the secondary air inlet channel is communicated with a gas guide channel, the gas guide channel is communicated with the cooling flow channel through a cooling flow channel inlet, and the cooling flow channel is communicated with the ionization chamber through a cooling flow channel outlet; the gas taken by the main air inlet channel directly enters the ionization chamber to be ionized, the gas taken by the secondary air inlet channel is guided to the cooling flow channel inlet through the gas guide channel, enters the cooling flow channel through the cooling flow channel inlet, cools the ionization chamber, and then enters the ionization chamber through the cooling flow channel outlet to be ionized, and the two gas flows entering the ionization chamber are accelerated through the nozzle after being ionized, so that the thruster generates thrust. The cooling design provided by the application has the advantages of simple structure and high energy utilization rate.

The ionization chamber comprises a negative electrode and a positive electrode, the negative electrode and the positive electrode are arranged in an overlapped mode, an ultraviolet lamp is arranged on one side of the positive electrode or the negative electrode, the negative electrode and the positive electrode are each provided with an air flow channel communicated with each other, the ultraviolet lamp is located at the inner end of the air flow channel, and the ultraviolet lamp is located at the outer end of the air flow channel. A high-voltage structure is arranged on the edge of an airflow channel of the negative electrode or the positive electrode. The high-voltage structure is arranged on the edge of the gas flow channel of the negative electrode or the positive electrode, so that the high collection efficiency of VOCs gas molecule ionization products is ensured. According to the photoionization detector provided by the utility model, a high bias voltage does not need to be additionally applied to eliminate the noise influence, and a complex hardware circuit or a humidity compensation algorithm does not need to be additionally arranged, so that the manufacturing cost and the failure rate of the photoionization detector are favorably controlled, and the development, debugging and maintenance costs of enterprises are also favorably reduced.

The invention provides an online self-checking method and system for a parallel plate ionization chamber and a beam loss monitoring system, and relates to the technical field of particle accelerators, the parallel plate ionization chamber comprises a bias pole plate and a signal pole plate, and a composite voltage formed by superposing a DC bias voltage and a preset low-frequency AC oscillation voltage is applied to the bias pole plate; a test current with the same frequency as the low-frequency alternating-current oscillation voltage is induced on the signal pole plate by using the natural capacitance between the bias pole plate and the signal pole plate; the test current is collected and analyzed to obtain at least one preset characteristic parameter, and the characteristic parameter comprises a quantity related to the magnitude or period of the test current; and comparing the characteristic parameters with a preset reference value so as to judge the health states of the parallel plate ionization chamber and the signal measurement link thereof. According to the invention, a radioactive source and a complex mechanical structure do not need to be additionally arranged, and online self-inspection with high reliability and comprehensive diagnosis of the parallel plate ionization chamber can be remotely realized.

The invention relates to a flat plate ionization chamber capable of measuring beta, X and gamma rays and a use method thereof, one side of an ionization chamber main body is provided with an incident window film, the incident window film side is provided with a balance cover, the balance cover is provided with a vent hole, and the vent hole is arranged on a circular plane of the balance cover; the spring needle is arranged in the ionization chamber main body and is in contact connection with the incident window film; the spring needle stud is located at the rear end of the spring needle, abuts against the rear wall of the ionization chamber body and is used for abutting against the spring needle to make continuous contact with the incidence window film. And the high-voltage conductive column is connected with the spring needle, is connected with an external power supply and is used for applying voltage to the incident window film through the spring needle. The balance cover is arranged in front of the ionization chamber main body, the balance cover provides a secondary electron balance condition for the ionization chamber to measure the strong penetrating radiation, the strong penetrating radiation can be measured by the ionization chamber, on the contrary, when the balance cover is removed, the weak penetrating radiation can be measured by the ionization chamber, and the strong penetrating radiation and the weak penetrating radiation can be measured by one ionization chamber. And the effect of weak through radiation can also be measured.

The application discloses a current source module capable of simulating output current of an ionization chamber and a nuclear radiation monitoring device, and the current source module comprises an interface unit, a program-controlled switch unit, a V-I conversion unit, a 2N-way DAC, a control unit and a power supply unit which are sequentially connected. The 2N-way DAC outputs multiple voltage signals, then the voltage signals are converted into current signals by the V-I conversion unit, the current signals can enter a preprocessor after the program-controlled switch and the interface, and the control unit can control the size of the voltage signal output by each channel of the DAC and the closing of the program-controlled switch, so that the size of the output current and the control of the direct current or pulse current are realized. The application can simulate the current generated by the ionization chamber in a gamma radiation field, and realizes the detection and result evaluation of the nuclear radiation monitoring device which is composed of the ionization chamber and the preprocessor and cannot be disassembled.

The application provides an ion source upper cover assembly and an ion source device. The fixed shielding cage in the ion source upper cover assembly can prevent the annular filament from being directly in contact with external structures to cause deformation or damage. The structure of the annular filament can effectively push the hot electrons emitted by the annular filament towards the ionization chamber, improve the ionization effect, and the ion source device is provided with the annular filament. The annular filament, the ionization cylinder and the shielding cage are coaxial, so that the electrons emitted by the annular filament can move in a more uniform electric field, thereby improving the probability of electron bombardment on the sample gas and improving the ionization efficiency and stability of the ion source device. Meanwhile, the ion source device has a wide range of emission current dynamic interval, strong anti-interference ability and wide range of sensitivity linear plateau area. The total pressure focusing electrode structure in the ion source device can also monitor the vacuum value in the detected space in real time, thereby playing a role in protecting the filament and the vacuum system.

The invention discloses a radiation therapy dose inspection system and method based on a space body distributed multi-layer ionization chamber. The radiation therapy dose inspection system comprises a cylindrical die body with a space body distributed ionization chamber matrix, a suspended supporting base capable of being adjusted to be horizontal, other functional plug-ins and matched software. According to the system and the method, a novel high-pressure transmission mode is adopted, a cylinder distributed air leakage type ionization chamber with higher spatial resolution is used for small radiation field measurement in radiotherapy, dose body distribution of radiotherapy radiation at various angles and depths can be collected and measured at a time without rotating a die body and angle correction, and the measurement accuracy is improved. And finally, the spatial distribution of the radiation dose in the cylindrical die body is obtained through software calculation, and high-precision measurement is realized.

The invention provides an RPS source microwave plasma ionization chamber structure and a plasma cleaning machine, the RPS source microwave plasma ionization chamber structure comprises an ionization chamber, the ionization chamber is internally provided with a hollow ionization chamber, and the top of the ionization chamber is provided with a first air inlet hole; the dispersing head is connected with the first air inlet hole, a plurality of annular guide holes are formed in the end face part, opposite to the first air inlet hole, of the dispersing head, and the annular guide holes are arranged in a wavy outward radiation mode with the hole center of the first air inlet hole as the original point and used for dispersing air flow entering the ionization cavity through the first air inlet hole; according to the invention, the dispersion head with a plurality of annular guide holes arranged in a wavy outward radiation manner is mounted in the ionization cavity, so that microwaves and process gas can be dispersed according to regions and enter the ionization cavity through the dispersion head, and the introduced gas flow can stably and uniformly enter the interior of the cavity; and the microwave energy can be quickly and intensively focused on a set ionization area to form a high-concentration gas atmosphere, so that the ionization efficiency of the gas is effectively improved, and the cleaning with high plasma density is further ensured.

The invention discloses a fission spectrometer used for fission fragment independent yield measurement. The fission spectrometer comprises a flight time detector and a screen grid ionization chamber fixedly connected to an outlet of the flight time detector. The flight time detector and the screen grid ionization chamber are provided with pump interfaces used for being connected with a vacuum pump for vacuumizing, and the flight time detector and the screen grid ionization chamber are each provided with a signal interface and a high-voltage electrical interface which are used for receiving detection signals. The signal interface and the high-voltage interface are respectively connected with the data acquisition system and the high-voltage system through lines; the method is suitable for independent yield measurement of fission fragments of multiple fission nuclides and multiple neutron energy points; according to the integrated device, online measurement of neutron-induced heavy nuclear fission can be achieved, errors caused by chemical treatment and step-by-step measurement in a traditional measurement technology are avoided, the mass resolution of fission fragments can be smaller than 1 amu, and the independent yield of the fission fragments can be obtained while excellent mass resolution is obtained.

The utility model discloses a pen-shaped ionization chamber probe positioning support, which relates to the technical field of positioning supports and comprises a positioning hollow ring, a first measuring scale is fixed on the outer side of the positioning hollow ring, and a second measuring scale is rotatably connected on the outer side of the positioning hollow ring and located at the upper end of the first measuring scale. Hand-screwing screws are symmetrically in threaded connection with the interior of the positioning hollow ring and located at the upper end of the second measuring ruler, guide grooves are symmetrically formed in the interior of the second measuring ruler and located on the outer side of the positioning hollow ring, and limiting sliding seats are slidably connected to the inner sides of the two guide grooves. According to the pen-shaped ionization chamber probe positioning support provided by the utility model, the first measuring scale and the second measuring scale are in a mutually vertical state by rotating and unfolding the second measuring scale, and the positioning hollow ring is conveniently ensured to be placed at the center of the circular opening by using the scale marks on the first measuring scale and the second measuring scale; the pen-shaped ionization chamber probe can be conveniently clamped and fixed by rotating the two hand-twisted screw rods to be matched with the fastening head.

The application relates to the field of ionization chambers, and provides a device for stretching an air equivalent film, which comprises a workbench, a first clamp and a second clamp, the workbench is used for laying the air equivalent film; the first clamp is arranged on the workbench and is used for fixing a first end of the air equivalent film on the workbench; the second clamp comprises an adjusting piece, a pressing piece and a moving piece, the pressing piece is used for pressing a second end of the air equivalent film onto the moving piece, the moving piece can move relative to the workbench, the adjusting piece is connected with the moving piece, and the adjusting piece is adjusted to drive the moving piece to move, wherein the first end and the second end are two opposite ends of the air equivalent film. The device for stretching the air equivalent film can improve the flatness of the air equivalent film.

The invention provides a high-sensitivity EI ionization device with a detachable independent ionization chamber, and belongs to the technical field of mass spectrometers. Comprising a sample introduction capillary tube, a first vacuum chamber, a filament, a reflection electrode, a second vacuum chamber and a vacuum pump, the sample introduction capillary tube is arranged on the input side of the first vacuum chamber, the first vacuum chamber is detachably connected into the second vacuum chamber, and the end, provided with the sample introduction capillary tube, of the first vacuum chamber is located outside the second vacuum chamber; small holes are formed in the upper side wall and the lower side wall of the first vacuum chamber, the lamp filament is arranged at the position, corresponding to the small holes, of the upper portion in the second vacuum chamber, the reflection electrode is arranged at the position, corresponding to the small holes, of the lower portion in the second vacuum chamber, and the first vacuum chamber becomes an ionization chamber under the action of the lamp filament and the reflection electrode. The second vacuum chamber is connected with a vacuum pump. The invention can effectively reduce the cleaning cost of the sample residue in the ionization chamber, improve the detection sensitivity of the mass spectrometer, and prolong the service life of the EI source filament.

The present application relates to neutron dosimetry method, specifically provide a kind of for boron neutron capture therapy fast neutron dosimetry method, by using the paired ionization chamber test system with different liquid environment, one kind of liquid environment has obvious absorption to thermal neutron, then the radiation source under the same power is measured, to obtain more accurate fast neutron dose and the rest two kinds of mixed radiation dose, to solve the problem of inaccurate neutron dose test of different kinds in the prior art in the application process of mixed radiation field, more accurate mixed radiation quantity value can be obtained, so that the different types of neutron dose in mixed radiation field are grasped, so as to improve the radiation effect in the application scene of mixed radiation field.

This invention discloses an automatic exposure control method suitable for X-ray machines, comprising the following steps: receiving a pulse signal and converting it into a square wave voltage signal; converting the square wave voltage signal into a current signal; and charging a capacitor according to the current signal to obtain a ramp voltage for exposure. According to some preferred embodiments of the invention, the pulse signal is a dose signal fed back from the ionization chamber of the automatic exposure control system. This automatic exposure control method for X-ray machines can be implemented based on basic components such as resistors, capacitors, diodes, and operational amplifiers. It requires simple components, has significant cost advantages, and is a purely analog circuit with fast response speed, low delay, and low power consumption.

The application discloses an ionization chamber of a photo-ionization detector, comprising a negative electrode and a positive electrode, the negative electrode and the positive electrode are arranged in an overlapping mode, an ultraviolet lamp is arranged on one side of the positive electrode or the negative electrode, the negative electrode and the positive electrode are both provided with airflow channels which are in communication with each other, the ultraviolet lamp is located at the inner end of the airflow channels, and the airflow channel edge of the negative electrode or the positive electrode is provided with a high-voltage structure. The high-voltage structure arranged at the airflow channel edge of the negative electrode or the positive electrode can ensure the high collection efficiency of the ionization product of VOCs gas molecules. Therefore, it is unnecessary to additionally apply a higher bias voltage to eliminate the noise influence, and it is also unnecessary to additionally set a complex hardware circuit or a humidity compensation algorithm, so that the manufacturing cost and the failure rate of the photo-ionization detector can be controlled, and the development, debugging and maintenance costs of enterprises can be reduced.

The application provides a static orbiting trap mass spectrometer with multiple ion sources, which comprises a static orbiting trap and an ion source. The static orbiting trap comprises a conical inner electrode and an outer electrode coaxially sleeved on the outside. The outer electrode is formed by the butt joint of two hollow conical electrode cylinders. The cavity between the outer electrode and the inner electrode constitutes an ion analysis cavity. The ion source is arranged on the side of the static orbiting trap. The ion source is in a cylindrical shape and emits ions along the axis. The ion source comprises repulsion electrodes, an ionization chamber and a lens sleeve which are sequentially arranged along the axis. An incident slot is formed on the outer wall of one of the electrode cylinders. The ion source emits ions into the incident slot, so that the ions enter the ion analysis cavity and move in the same spiral direction. There are at least two ion sources. One of the ion sources emits small mass number ions, and the other emits large mass number ions. The two ion sources are directly coupled with the static orbiting trap, which can weaken the mass discrimination effect, realize the detection and analysis of small mass number ions, and improve the mass range.

The present invention relates to a satellite propulsion device (10) employing electron cyclotron resonance and magnetic nozzles, the propulsion device extending at least partially along a longitudinal axis (X) and comprising an outer conductor (22) extending longitudinally along said axis and an ionization chamber (8), the outer conductor laterally bounding the ionization chamber and the ionization chamber including a circular lateral opening (24) having a diameter D, and further comprising a screen (6) arranged coaxially with the longitudinal axis (X), the screen (6) having a ratio of its maximum lateral dimension D' to D between 3 and 15 and including a portion made of insulating material (61) and / or a portion made of conductive material (62).

An atmospheric pressure ionisation source comprising: an ionisation chamber, comprising an aperture for receiving at least the distal end of a capillary into the ionisation chamber in use, the apertur

The utility model relates to the technical field of radon gas detection, in particular to an intelligent sensor which is used for detecting radon gas and has an anti-vibration function. Comprising an ion pulse ionization chamber and a detection assembly in the ion pulse ionization chamber, a main control circuit board is arranged at the upper end of the ion pulse ionization chamber, the detection assembly is connected to the main control circuit board, a vibration sensor is fixedly arranged on the main control circuit board, the vibration sensor is arranged on the main control circuit board, the model of the vibration sensor is SW-18015PZR-10G12B3, and the detection assembly is connected to the detection assembly. When environment vibration or real object vibration occurs, the vibration sensor transmits a switching value signal to the main control circuit board, the main control circuit board receives the switching value signal of the vibration sensor, and at the moment, the main control circuit board controls other units to stop working. And the service life and the stability of the radon gas sensor are well protected.

This invention belongs to the field of liquid level measurement technology for containers or pipelines containing highly radioactive media, and relates to an ionization chamber type liquid level detection device suitable for various highly radioactive media. The device includes a multi-electrode ionization chamber detector, a collimating shield, and a pre-processing unit. This invention guides the radiation emitted by the highly radioactive media into the housing through multiple collimating windows. This ionizes the inert gas in each detection sensitive area, generating charged particles. The high-voltage electric field in each detection sensitive area drives the particles to move to the corresponding collecting electrode. The collecting electrode captures the charged particles and generates an ionization signal, which is sent to the pre-processing unit. The pre-processing unit determines the liquid level height of the corresponding highly radioactive media based on the varying ionization strength signals generated by the ionized inert gas caused by the different radiation intensity emitted by the various highly radioactive media. This allows for the simultaneous identification and location of multiple coexisting highly radioactive media under non-contact conditions.

The present invention relates to an apparatus (1) for detecting neutrons, the apparatus comprising at least one sealed ionization chamber (2) utilizing optical transduction, the ionization chamber having a plurality of cavities, each cavity being operated based on optical transduction using an optical fiber with a free end within the cavity, which allows for multi-point neutron flux measurement, wherein the measurement points are axially distributed.

This invention relates to the field of radioactive separation technology, and discloses an automated solution preparation and delivery control method and system for At-211 separation, comprising: Step 1, determining the column bed volume, setting the minimum operating volume particle size, and determining the pump running time; Step 2, solidifying the reagent and matching it with the valve inlet, obtaining the background current and determining the low threshold current, high threshold current, tail threshold current, and volume confirmation rules for the buffer solution; Step 3, generating the loading solution; Step 4, delivering the low-acid washing column solution, buffer solution, and preset equilibration solution to obtain the separation column; Step 5, loading the sample and comparing the output current of the ionization chamber with the low threshold current and high threshold current to determine the three states; Step 6, switching the collection valve to the product bottle and cutting off the organic elution solvent; Step 7, controlling the collection valve and determining the actual product volume. This invention achieves automated and quantitative control of solution preparation, delivery, elution, and collection during the At-211 separation process.

An ionizer disposed in an ionization chamber separated from an analysis chamber by a partition provided with an ion introduction port, the ionizer including: an electrospray ionization probe 111 configured to charge and nebulize a liquid sample as charged droplets, the electrospray ionization probe being disposed such that a nebulization axis is orthogonal to a central axis of the ion introduction port; and a heated gas supply mechanism configured to blow a heated gas to a position between a tip of the electrospray ionization probe and an intersection point X of the nebulization axis and the central axis, where the position is separated from the tip by a predetermined distance or more.

Device (100) for measuring alpha radiation activity and beta radiation activity of radioactive aerosols of artificial origin enriched on a dust filter (40), comprising: - a first particle detector (10) in the form of an ionization chamber, in particular a pulsed one, which is designed to generate a first count rate depending on the alpha radiation activity, - a second particle detector (20) designed to generate a second count rate depending on the beta radiation activity, and - an evaluation unit (50) designed to determine the alpha radiation activity and the beta radiation activity as a function of the first count rate and the second count rate.

The utility model discloses ionization chamber radiation dose measuring equipment, which comprises an electromagnetic radiation measuring instrument and a measuring support plate, the upper side of one end of the measuring support plate is rotatably provided with a measuring instrument bayonet socket through a vertical plate and a connecting shaft, and a handheld part at one end of the electromagnetic radiation measuring instrument is inserted into an inserting groove in the measuring instrument bayonet socket. The upper end of the measuring support plate is rotatably provided with a connecting shaft, one end of the connecting shaft is in transmission connection with a first motor through a first gear set, the lower end of the measuring support plate is rotatably provided with a lower support rod through a bearing seat and a bearing, and a second motor is in transmission connection between the bearing seat and the lower support rod through a second gear set. The handheld part at one end of the electromagnetic radiation measuring instrument is inserted into the insertion groove in the measuring instrument insertion seat and is used for performing insertion positioning on one end of the electromagnetic radiation measuring instrument, operation measurement can be performed without hand holding, and the convenience of measurement and use is improved.

A neutron detector comprising an optical fission chamber with a reflective optical cavity and a detection head coupled to the chamber comprising an optical lens and an optical fiber coupler. The invention relates to a neutron detector (1) comprising at least one sealed ionization chamber (2) with optical transduction, called an optical fission chamber (OFC) with a single optical cavity, the operation of which is based on optical transduction and which integrates, at one of its longitudinal ends, a window and an optical lens as an optical interface and, at the other end, a mirror to reflect photons traveling in the opposite direction to that of the window. Figure for the abstract: Fig. 9