340 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 present invention proposes a sputtering cleaning system and cleaning method for the inner wall of the ionization chamber of a radio frequency ion thruster. The system is composed of a gas distributor, a potential control line, a radio frequency coil, an ionization chamber, a screen grid, an acceleration grid, a positive DC voltage source, a radio frequency power supply, a negative DC voltage source and a conductive tape. The method includes: 1. The radio frequency ion thruster is started, and plasma is formed in the ionization chamber; 2. A positive voltage is applied to the screen grid, and ions are drawn out by the grid system, and the thruster enters a working state; 3. When the conductive film is thicker and the power input is weakened, the positive DC power supply is turned off, and no ions are drawn out of the thruster; 4. The negative DC power supply is turned on, and a negative voltage is slowly applied to the potential control line to increase the energy of ions hitting the inner wall of the ionization chamber; 5. The conductive film on the inner wall of the ionization chamber is bombarded by ions, and particles are sputtered out. The particles are neutral and are discharged from the ionization chamber under the action of the neutral particle flow, thereby achieving cleaning of the inner wall of the ionization chamber.

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 discloses a dual-mode precise regulation and control method and device for a proton treatment system, and relates to the technical field of proton treatment, and the device comprises a superconducting cyclotron, a beam transmission module, a treatment head module which comprises a first ionization chamber, a second ionization chamber, a range regulator, a multi-leaf grating and scanning iron, a treatment chair and a control module, the control module is used for receiving and analyzing a treatment plan and controlling the working states of the superconducting cyclotron, the beam transmission module, the treatment head module and the treatment chair in different working modes according to the treatment plan; the working mode comprises a first working mode and a second working mode, and the radiation dose of a proton beam required by the second working mode is far greater than the radiation dose of the proton beam required by the first working mode. The dual-mode precise regulation and control device can support a conventional working mode and also can support a flash therapy working mode, and different working modes can be switched to realize a treatment plan.

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.

The embodiment of the utility model provides a multi-diaphragm switching device for monitoring an ionization chamber. The multi-diaphragm switching device comprises a fixed frame, a movable frame and a driving device, the fixed frame is of a hollow rectangular block structure with a transmission hole in the middle, the movable frame comprises an upper connecting block and a lower movable frame body, the movable frame body comprises a connecting plate and two diaphragm mounting plates which are parallel in the front-back direction, the diaphragm mounting plates are located on the outer sides of the front plate face and the rear plate face of the fixed frame respectively, and the movable frame can move left and right along the fixed frame; a plurality of diaphragm mounting holes are formed in the diaphragm mounting plate in the left-right direction, and a diaphragm is arranged in each diaphragm mounting hole; the execution end of the driving device is connected with the upper connecting block. According to the technical scheme, the multiple sets of diaphragms are configured for monitoring the ionization chamber, and the diaphragms needing to be configured can be put into the preset working positions through the translation action of the driving device, so that automatic switching of the diaphragms is realized, the labor intensity is reduced, and the working efficiency is 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 present application discloses a detection method, a surface density device, a detection apparatus, and a storage medium. The surface density device includes a radiation source and an ionization chamber disposed at an interval from the radiation source. The detection method includes: during the operation of the surface density device, obtaining a first current pose of the radiation source and a second current pose of the ionization chamber; confirming a first pose deviation of the radiation source according to the first current pose; confirming a second pose deviation of the ionization chamber according to the second current pose; and determining whether a pose change occurs between the radiation source and the ionization chamber according to the first pose deviation and the second pose deviation. In the detection method according to the embodiments of the present application, the current poses of the radiation source and the ionization chamber are first obtained respectively, and then it is confirmed whether a pose change occurs between the radiation source and the ionization chamber according to the current poses, so that corresponding measures can be taken when a pose change occurs between the radiation source and the ionization chamber, thereby improving the accuracy of the measurement result of the surface density device.

The present invention relates to a spacecraft electric thruster particularly suitable for both propellant-fed and air-breathing electric space propulsion comprising an ionization chamber (11) for plasma generation which develops along a central development axis (X), wherein the ionization chamber (11) has a chamber inlet (12) configured to allow gas inflow and a chamber outlet (13) configured to allow extraction of ionized gas particles; a power injection assembly (30) configured to perform electron heating for plasma generation inside the ionization chamber (11); a magnetic assembly (20) configured to generate a magnetic field for plasma confinement in the ionization chamber (11); and an ion extraction and acceleration assembly (40) configured to extract ionized gas particles from the ionization chamber (11) through the chamber outlet (13) and accelerate them along an ion acceleration direction (Z), wherein the power injection assembly (30) comprises a microwave power delivery system (31) configured to deliver an electric field oscillating at a selected microwave frequency (f) and to inject the generated oscillating electric field in the ionization chamber (11), and wherein the ionization chamber (11) comprises a plurality of walls (11a, 15,16,41) closed to the passage of microwaves apart from a portion of at least one lateral wall (11a) of the plurality of walls (11a, 15,16,41) at which the power delivery system (31) is coupled to inject the generated oscillating electric field in the ionization chamber (11), and is resonant for electromagnetic fields oscillating at the selected microwave frequency.

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 low-pressure ionization chamber comprises a closed chamber, a low-pressure environment lower than the standard atmospheric pressure is formed in the closed chamber, and an electrode plate assembly is arranged in the closed chamber to collect electron-ion pairs in the closed chamber in the low-pressure environment; by arranging the negative-pressure closed chamber, the air density is reduced under the condition of low air pressure, so that the number of gas molecules in unit volume is reduced, the total number of charges generated by radiation ionization of a gas medium is reduced, and then the charge density and the ion recombination probability are reduced, so that the saturation characteristic of the ionization chamber is influenced.

The present invention relates to an ion mobility spectrometer, which at least has a first drift chamber and a first switchable ion gate for controllably transferring ions into the first drift chamber, wherein: the first ion gate is designed as a field-switching ion gate having at least a first counter electrode and a first injection electrode; wherein, a first ionization chamber is formed between the first counter electrode and the first injection electrode, and ions to be analyzed by ion mobility spectrometry can be fed from an ionization source into the first ionization chamber. The present invention also relates to an ion mobility spectrometer, which at least has a first drift chamber and a first switchable ion gate for controllably transferring ions into the first drift chamber, as well as a second drift chamber separated from the first drift chamber and a second switchable ion gate for controllably transferring ions into the second drift chamber. The present invention also relates to a method for analyzing a sample by ion mobility spectrometry using an ion mobility spectrometer, such as an ion mobility spectrometer of the aforementioned type, wherein, by means of an ionization source, ions to be analyzed are generated from the sample and provided in the ionization chamber of the ion mobility spectrometer.

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 present invention provides a method and system for detecting the neutralization ability of PFG, wherein the method includes: turning on the PFG and using the PFG's gas supply system to deliver an inert gas into the ionization chamber; providing cations and electrons generated by the ionization of the inert gas into the shielding cover of the ion detection module; using the cation detection cup of the ion detection module to detect the distribution of the cations in a direction parallel to the wafer surface; and obtaining the distribution of the electrons in a direction parallel to the wafer surface based on the distribution of the cations. The present application uses the cation detection cup to detect the distribution of cations emitted by the PFG to reversely characterize the distribution of electrons emitted by the PFG in the horizontal direction, thereby effectively detecting whether the overall distribution of free electrons drawn out of the PFG chamber can meet the requirements of positive ions (ion beam current), thereby realizing the detection of the neutralization ability of the PFG.

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 embodiment of the utility model provides wafer photoresist removing equipment and a wafer photoresist removing system, and the wafer photoresist removing equipment comprises an ionization chamber which generates plasma; the bearing chamber is communicated with the ionization chamber and is used for bearing a wafer; the bearing chamber comprises a bearing table and a lifting assembly; wherein the bearing table is provided with a bearing surface, and the bearing surface is provided with a through hole; the lifting assembly moves along the through hole and carries and lifts the wafer. The limiting assembly is located between the ionization chamber and the bearing chamber and fixedly arranged on the bearing surface, and the limiting assembly is exposed out of the lifting assembly; when the bearing table bears the wafer, the limiting assembly abuts against the wafer in the circumferential direction of the wafer. By adopting the technical scheme, the position of the wafer on the bearing table can be fixed.

The present invention relates to the field of nuclear radiation detection technology, and provides a tritium measurement device with radon discrimination capabilities. The device comprises a gas flow ionization chamber, a current amplification circuit, a pulse amplification circuit, and a signal processing circuit. The collector of the gas flow ionization chamber is connected to the current amplification circuit, which amplifies and measures the current signal in the gas flow ionization chamber. The measured signal includes the current signals of tritium beta particles and radon alpha particles. The high-voltage electrode of the gas flow ionization chamber is connected to the pulse amplification circuit after passing through a DC-blocking capacitor, which measures the pulse signal generated by radon alpha particles. The device structure of the present invention is convenient to implement, comprising only a single detection device. It can measure and discriminate radon alpha particles entering the gas flow tritium ionization chamber in real time, accurately compensate for tritium measurement results, and prevent further increase in the total mean square error of the measurement results after compensation.

The present invention belongs to the field of ionizing radiation measurement, and discloses a portable micro-current constant current source device, which includes a spherical ionization chamber. The spherical ionization chamber includes a spherical metal shell and a collecting electrode located inside the spherical metal shell. The spherical metal shell is provided with a high-voltage electrode sealing interface. The outer side of the spherical metal shell is coated with an insulating coating. An incident window is opened at the bottom of the spherical metal shell. A radiation source box is provided at the bottom of the spherical metal shell. A radiation source facing the incident window is installed in the radiation source box. An F4 insulator is installed at the top of the spherical metal shell; the collecting electrode includes a first collecting ring, a second collecting ring and a current output terminal. The first collecting ring and the second collecting ring are connected at right angles. The top of the first collecting ring is connected to the current output terminal, and the current output terminal is led out from the center of the F4 insulator. This micro-current constant current source device can provide a stable current output.

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 effectively reducing adsorption and accumulation of tritium on the wall of an ionization chamber. A non-metal hydrophobic coating is deposited on the surface of the wall of the ionization chamber. At present, the ionization chamber wall is mainly made of a metal material, tritium atoms enter metal lattices to accumulate, and therefore the tritium memory effect is caused, a layer of dense, uniform and firmly-combined hydrophobic coating is deposited on the chamber wall, and adsorption and accumulation of tritium on the chamber wall can be effectively reduced.

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.

A radiation dose measurement apparatus (200) and a radiation dose measurement method. The radiation dose measurement apparatus (200) comprises: an ionization chamber (210), which defines an accommodating space (211), wherein the accommodating space (211) is filled with a gas, and the gas is configured to react with rays entering the accommodating space (211), so as to generate electrons; and N VDMOS devices (100), which are arranged in the accommodating space (211), wherein N is an integer greater than or equal to 1, a change occurs in a source-drain reverse current-voltage curve of at least one of the N VDMOS devices (100) in response to the electrons, and the radiation dose of the rays is obtained by means of the source-drain reverse current-voltage curves before and after the change.