251 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 utility model relates to the field of building safety, in particular to a building fire alarm device which comprises a base, a shell and a protective cover, a controller is installed at the bottom of the base, a photoelectric sensor is installed on one side of the front face of the controller, and a networking module is installed on the other side of the front face of the controller; the base is provided with a photoelectric sensor and a controller, the front surface of the controller is provided with an ion type sensor, the bottom of the base is provided with an ionization chamber through the controller, the ionization chamber is covered with a shell, and the bottom of the shell is provided with a protective cover. The detection sensitivity and accuracy are improved, the false alarm rate is reduced, the built-in networking module supports multiple communication protocols, butt joint with various fire control systems and safety management systems is facilitated, remote monitoring and instant alarm are achieved, and the fire prevention and control efficiency and response speed are improved.

Disclosed is a calibrator device designed to measure the activity of a radio element, including: an ionization chamber, intended to receive the radio element; and electronic / computer system for controlling the operation of the calibrator device. The electronic / computer system includes voice control, which include: at least one microphone capable of capturing a voice instruction emitted by the operator; a recognition module designed to convert the voice instruction into a request that can be executed by the electronic / computer system; and a control module designed to control the execution of the request by the electronic / computer system.

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 utility model relates to the field of quality control of medical electron linear accelerators. Multi-dimensional radiotherapy dose measuring equipment comprises a multifunctional water tank, mounting grooves arranged in a matrix mode are formed in a bottom plate of the multifunctional water tank, the mounting grooves are used for placing thermoluminescence dosimeters, and film slots used for inserting films are formed in the bottom of the inner wall of the multifunctional water tank; three mounting holes with different heights are formed in a side plate of the multifunctional water tank, the mounting holes are used for being in butt joint with an ionization chamber plug or a water tank plug, and the water tank plug is used for blocking the mounting holes; the ionization chamber plug is used for installing the ionization chamber, and a through hole for inserting the ionization chamber is formed in the ionization chamber plug; the thermoluminescence dosimeter box further comprises a bearing bottom plate, bearing grooves distributed in a matrix mode are formed in the bearing bottom plate, and the bearing grooves are used for containing thermoluminescence dosimeters. By optimizing the structure of the water tank, compared with a traditional one-dimensional water tank, the dose measurement dimensionality is greatly improved.

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 present invention relates to the field of clinical radiotherapy technology, and in particular to a test system and method for the effect of an iodized oil area on photon radiotherapy dose. The system comprises: a plurality of iodized oil samples, each of which is made by mixing minced pig liver and iodized oil in different proportions; a cylindrical sample tube, each of which is composed of a plurality of detachably connected sample chambers, each of which is provided with the iodized oil samples in the sample chambers, each corresponding to the iodized oil sample. The linear accelerator irradiates an abdominal simulation phantom into which the sample tube is inserted. The CT scanner is connected to a radiotherapy planning system, which simulates the irradiation of the sample tube with a photon beam based on a CT image and obtains a simulated dose of electron density. The present application can characterize the effect of the iodized oil area on the photon radiotherapy dose by comparing the simulated dose of electron density obtained by the radiotherapy planning system with the actual dose of electron density obtained by an ionization chamber detector.

The application relates to an in-situ detection device for lateral high-temperature electro-catalytic reaction gas-phase intermediate products, which comprises a high-temperature electro-catalytic reactor, an ionization chamber and a mass spectrometer which are sequentially connected; the high-temperature electro-catalytic reactor comprises a reactor flange connected with the bottom of the ionization chamber, a glass outer sleeve pipe connected with the reactor flange, an electrode reaction pipe arranged in the glass outer sleeve pipe, a heating assembly arranged outside the glass outer sleeve pipe and a glass pipe clamping sleeve fixedly sleeved at both ends of the glass outer sleeve pipe. The glass outer sleeve pipe is heated by the heating assembly, the two tail ends of the glass outer sleeve pipe and the electrode reaction pipe are isolated by ceramic gaskets, the annular electrode plate can perform ionization reaction on the reactants under high-temperature conditions, the electrode reaction pipe can be fully combined with the reactants, the reactants can be fully reacted in high-temperature catalysis, and the measured substances of the reactants after heating can fully enter the mass spectrometer.

The embodiment of the present application provides an ionization chamber structure, which comprises an incidence assembly, a collection assembly, a pressure reduction ring, a high-voltage electrode, a collection electrode and an adjusting assembly. The incidence assembly comprises an incidence window. The incidence assembly and the collection assembly are arranged at intervals along a height direction. A plurality of pressure reduction rings are arranged along the height direction and are arranged at intervals between the incidence assembly and the collection assembly to form an ionization cavity together with the incidence assembly and the collection assembly. The high-voltage electrode is arranged in the ionization cavity and is located on one side of the incidence assembly. The collection electrode is arranged in the ionization cavity and is located on one side of the collection assembly. The adjusting assembly is connected with the incidence assembly and the collection assembly at opposite ends, respectively, to adjust the interval distance between the incidence assembly and the collection assembly. The ionization chamber structure of the embodiment of the present application has strong versatility.

The invention discloses a nano-droplet interface ionization mass spectrum ion source device and an operation method thereof, and relates to the field of nano-droplet interface ionization mass spectrum ion source devices, the device comprises a nano-spray needle used for loading a sample solution and realizing a nano-spray process; the metal electrode is inserted into the nano-spray needle, is in direct contact with the sample solution and is used for providing a high-voltage electric field required by nano-droplet interface ionization for the sample solution; and the ionization chamber is pre-filled with inert auxiliary gas and is used for protecting the interface ionization process of the nano liquid drops. High-sensitivity detection of polycyclic aromatic hydrocarbon in samples such as small-size single cells is realized, and higher signal intensity is obtained; better detection response to weak polar compounds (especially compounds with aromatic skeleton structures) in a mixed sample is realized; the detection of the weak polar compound polycyclic aromatic hydrocarbon in the single cell is realized.

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 invention discloses a method for measuring intraoperative radiotherapy Intrabeam water absorbed dose based on air kerma. The method comprises the following steps: characterizing a spectrum; a radiation substance matched with or close to the spectrum is selected, and the energy spectrum of the radiation substance is represented; acquiring measurement parameters of the air kerma rate; calculating a first correction factor by adopting a Monte Carlo method; calculating a second correction factor based on ionization chamber rod scattering; creating a conversion factor from air kerma energy to 1cm water absorbed dose at the measurement point; and calculating the water absorption dose rate at the position of 1cm. The active measurement method is adopted, the ionization chamber is used for measuring the absorbed dose of the rays generated by the spherical source applicator in water, namely the measured value is the absorbed dose at the position of 1 cm in water, the advantages of being easy to operate and short in measurement time are achieved, real-time reading can be achieved, and waiting is not needed.

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 utility model provides an ion implanter, which comprises a shell provided with a processing chamber and a shielding plate arranged at the bottom of the processing chamber and used for bearing residues; the gas supply device is arranged in the shell in a penetrating manner, communicates with the processing cavity and provides a gas supply channel for the protective gas to pass through; the ionization cavity is arranged in the processing cavity, is communicated with a gas outlet port of the gas supply channel, is used for carrying out ionization treatment on the protective gas and generating target ions, and is positioned above the shielding plate; and the power supply device is arranged in the processing cavity, is electrically connected with the ionization cavity, and provides driving voltage for the ionization cavity, so that the ionization cavity sprays the target ions to the processing cavity. By adopting the technical scheme, the cleanliness in the processing cavity can be improved.

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 present invention discloses a heat dissipation device for a high-power plasma structure, comprising an ionization chamber and heat dissipation components arranged on the front and rear sides of the ionization chamber. The present invention relates to the technical field of plasma generators. The heat dissipation device for a high-power plasma structure utilizes an inner spiral gas guide pipe as an airway to increase the gas residence time while driving the inner spiral gas guide pipe to rotate. In conjunction with the arrangement of a first water channel, a second water channel, and a third water channel, the rotation of the inner spiral gas guide pipe is accelerated when cooling water passes through at high speed. The centrifugal force generated by the rotation increases the core density of the gas, the frequency of electron-molecule collisions, and the ionization efficiency. The inner spiral gas guide pipe is placed in the second water channel, and heat is dissipated during the rotation of the inner spiral gas guide pipe, effectively improving the heat dissipation efficiency of the ionization chamber and providing efficient and reliable protection for the long-term stable use of the equipment.

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.

The invention belongs to the technical field of nuclear power, and particularly relates to a compensation voltage setting method and device for a compensation ionization chamber, a computer readable storage medium and electronic equipment. The method comprises the following steps: determining a current attenuation multiple of a compensation ionization chamber; based on a preset mapping relation model, determining a compensation voltage increment corresponding to the current attenuation multiple; wherein the mapping relation model is used for representing a mapping relation between the compensation voltage increment and the current attenuation multiple; and setting the compensation voltage according to the compensation voltage increment. According to the invention, the mapping relation model used for representing the mapping relation between the compensation voltage increment and the current attenuation multiple can be constructed in advance, so that the compensation voltage increment corresponding to the current attenuation multiple can be determined based on the mapping relation model, and the compensation voltage is set according to the compensation voltage increment. The measurement precision of the compensation ionization chamber can be effectively improved, and a more reliable decision basis is provided for safety control of a reactor.

To improve the uniformity of the plasma density in an ionization chamber.SOLUTION: An ion source 1 includes a vaporizer 100 that generates vapor from a solid source material, a first container 10 having a plenum chamber 20 fluidly connected to the vaporizer 100, and a second container 50 having an ionization chamber 50a fluidly connected to the plenum chamber 20, and the first container 10 having a first wall 20a to which the vaporizer 100 is connected and a second wall 20b opposite the first wall 20a, the second wall 20b having a slit 45 opening along the longitudinal direction of the plenum chamber 20, and the vapor is supplied from the plenum chamber 20 to the ionization chamber 50a through the slit 45.SELECTED DRAWING: Figure 2

The present invention discloses an X-ray measurement spot collimation system, which relates to the field of X-ray collimation. The system includes: an X-ray source, a transmitting end collimator, a receiving end collimator, and a ray detector. When the collimation system is in operation, first, after the cone beam of rays emitted by the X-ray source passes through the transmitting end collimator with a funnel-shaped window cross section, the X-rays are initially collimated so that the light spot on the sample to be measured has the desired shape. Secondly, after passing through the sample to be measured, the rays will pass through the receiving end collimator with a trapezoidal window cross section to shield scattered rays. Finally, the collimated ray beam reaches the X-ray detector to obtain the final ray intensity. The present invention can control the size and shape of the light spot measured by the system, ensure the spatial resolution of the system measurement, and minimize the influence of scattered rays while ensuring that the collimated main beam of rays is received by the ionization chamber as much as possible after passing through the pole piece, thereby improving the ray utilization rate and thus improving the measurement accuracy.