136 results about "Cold cathode" patented technology

The embodiment of the invention discloses a cold cathode flat plate X-ray source capable of coding light emitting and a coding light emitting method, the ray source comprises a vacuum sealing cavity, a cathode assembly and an anode assembly, the cathode assembly and the anode assembly are arranged in the vacuum sealing cavity in a sealing manner, and the cathode assembly and the anode assembly are oppositely arranged at an interval; a vacuum working space for electron acceleration and X-ray generation is formed; the cathode assembly comprises a cathode substrate and a nano cold cathode electron source array arranged on the cathode substrate; the anode assembly comprises an anode substrate and a transmission anode target arranged on the anode substrate; wherein at least one of the nanometer cold cathode electron source array and the transmission anode target is in a coding state: when the nanometer cold cathode electron source array is in the coding state, the nanometer cold cathode electron source array comprises a micro-unit electron source array capable of independently addressing, and a preset coding pattern is formed; and when the transmission anode target is in a coding state, a metal coating with a preset coding pattern is formed on the surface of the anode substrate through a micromachining process so as to integrate a coding function.

The invention discloses a novel electronic gun for a cyclotron wave protector, and relates to the technical field of vacuum electronic devices. The electron gun comprises a cathode assembly, an anode assembly, a supporting assembly and a permanent magnet system. Wherein the cathode assembly adopts a planar cold cathode structure; the anode assembly comprises an anode main body and an electron beam channel in the anode main body; the cathode and the anode are fixedly connected through a supporting assembly; the permanent magnet system provides a uniform magnetic field. The cold cathode is adopted to replace a traditional hot cathode to generate high-quality strip-shaped electron beams, and the device has the advantages of being simple in structure, easy to integrate, rapid to start, long-acting, reliable, low in consumption and energy-saving.

The present invention provides a multi-directional connection hub including a plurality of openings to which an anode adapter made of a metal material is connected through an insulation tube and an electron gun which emits electrons to the anode adapter to generate X-rays is connected, wherein the openings include a plurality of side openings to which the electron gun is connected and an upper opening through which the X-rays generated by the electrons, which are provided from the electron gun through the side opening and collide with the anode adapter, are emitted, and an emission direction of the X-rays is changed toward another side opening of the plurality of side openings or the upper opening according to a type of the anode adapter and a type or installation location of the electron gun.

The embodiment of the invention provides a foil structure with a carbon nanotube and a preparation method thereof, a cold cathode and an X-ray tube, the foil structure comprises a metal substrate, the metal substrate is provided with a first surface and a first side surface, the first side surface is vertical to the first surface, and the first side surface is located at the edge of at least one side of the metal substrate; the bonding layer is located on the first surface of the metal substrate; the bonding layer is arranged on the first surface of the metal substrate, the multiple carbon nanotubes are located on the first surface of the metal substrate, the bonding layer is used for enhancing the bonding strength of the metal substrate and the multiple carbon nanotubes, the multiple carbon nanotubes comprise a carbon nanotube film and multiple discrete carbon nanotubes, the carbon nanotube film is located on the first surface, and the discrete carbon nanotubes are located on the second surface. The multiple discrete carbon nanotubes are located in the area, close to the first side face, of the first surface, at least the other part of the multiple discrete carbon nanotubes is located outside the carbon nanotube film, orthographic projections of the multiple discrete carbon nanotubes on the metal substrate are located outside the first surface, and the at least the other part of the multiple discrete carbon nanotubes protrude in the direction away from the metal substrate relative to the first side face.

The invention discloses a cold cathode ionization gauge driving acquisition circuit, relates to the field of vacuum measurement, and solves the problems of signal conversion nonlinearity and large ion flow when a gauge tube works at a lower vacuum degree in the existing cold cathode ionization gauge driving acquisition technology. Comprising an ion current logarithmic acquisition circuit used for converting the ion current of the cold cathode ionization gauge into a voltage signal, a current monitoring circuit used for generating a control signal according to the voltage signal, and a voltage-controlled high-voltage driving circuit used for driving the cold cathode ionization gauge according to the control signal. The nonlinear compensation operation conditioning circuit is used for performing nonlinear compensation on the voltage signal according to the control signal to obtain an operation acquisition voltage, and the operation acquisition voltage is used for being input into an acquisition system; the non-linear problem of signal conversion is solved through the non-linear compensation circuit, negative feedback loop control is carried out through the current monitoring circuit and the voltage-controlled high-voltage driving circuit, the driving voltage of a gauge tube is reduced, and the maximum ion current is limited at a low level.

The invention provides a cold cathode flat plate X-ray source and a control method, and relates to the technical field of X-rays. In the application, the cold cathode flat plate X-ray source comprises an anode substrate and a cathode substrate; the anode target material is arranged on the anode substrate; the cathode assembly is arranged on the cathode substrate and comprises a plurality of cathode blocks which are distributed in an array mode, each cathode block comprises a plurality of nanowire cold cathodes which are distributed in an array mode, and in the X-ray output process, the nanowire cold cathodes are arranged on each cathode block. And if at least one row of nanowire cold cathodes currently used for emitting electrons in the cathode block are abnormal, determining at least one row of nanowire cold cathodes without abnormality in the cathode block, and controlling the nanowire cold cathodes to emit electrons to the anode target material so as to generate X-rays. Based on the above content, the problem of low utilization rate of the cold cathode flat plate X-ray source in the prior art can be improved.

This invention provides a cobalt foam-carbon nanotube composite cathode material, its preparation method, and its applications, relating to the field of cathode material preparation technology. The composite cathode material of this invention is obtained by depositing a carbon nanotube array on a cobalt foam substrate. As a cold cathode material for field emission, this composite cathode material exhibits low turn-on and threshold electric fields, high current density, excellent field emission performance, and excellent current stability, meeting the performance requirements of field emission cathode materials. Furthermore, the preparation method of this composite cathode material is safe and simple. This invention provides a novel cathode material solution for high-performance, long-life vacuum electronic devices, with promising application prospects.

This invention relates to a cold cathode X-ray inspection system and method with eddy current detection function, used for defect detection and evaluation of composite materials with conductive and magnetic panels and pure metal materials of a certain thickness. The inspection system includes a cold cathode X-ray instrument, a DR receiving panel, and a laptop computer. In addition to the cold cathode X-ray detection board, the mainboard of the cold cathode X-ray instrument also has an eddy current detection board. The eddy current detection board and the cold cathode X-ray detection board share the built-in power supply unit and operation unit of the cold cathode X-ray instrument. A transparent flexible panel is added to the photosensitive element layer of the DR receiving panel. A transparent detection coil made of metal coating technology with an array arrangement is set on the transparent flexible panel. During the inspection, the cold cathode X-ray image of the inspected workpiece and the eddy current detection signal on the surface of the inspected workpiece can be acquired simultaneously. By comparing, fusing, and analyzing the two image signals, a complete and accurate inspection result is obtained.

The invention relates to the technical field of vacuum microelectronic devices, in particular to a nano cold cathode electron source array and a preparation method thereof, and the nano cold cathode electron source array comprises a substrate; the bottom cathode electrode strips are arranged in parallel; the bottom gate electrode strips are arranged in parallel; the insulating layer covers and separates the bottom cathode electrode strip and the bottom gate electrode strip, and the insulating layer is located at the top of the substrate; a top cathode electrode and a top gate electrode which are manufactured at the top of the insulating layer are respectively connected with the bottom cathode electrode strip and the bottom gate electrode strip through the first etching through hole and the second etching through hole; and the composite cold cathode comprises a nano cold cathode manufactured at the top of the top cathode electrode and a surface film coating the nano cold cathode. According to the invention, the conductivity, thermal conductivity, work function and other characteristics of the composite cold cathode can be regulated and controlled through the surface film, the field emission characteristic of the nano cold cathode in a cold cathode electron source is improved, large-area preparation can be realized, and the application of the cold cathode electron source in a large-area flat X-ray source device is expanded.

The invention provides a carbon nanotube cold cathode, a preparation method thereof and an X-ray tube, and the preparation method of the carbon nanotube cold cathode comprises the following steps: carrying out ball milling on an agglomerated carbon nanotube to obtain carbon nanotube powder; mixing the carbon nanotube powder with a first solvent and an electrolyte solution, and performing ultrasonic oscillation to obtain a suspension; a metal substrate is placed in the suspension liquid for electrophoretic deposition, and the carbon nano tube thin film cold cathode is obtained; coating a curing agent on the carbon nano tube thin film cold cathode for cross-linking curing to obtain a cured carbon nano tube cold cathode; and enabling the carbon nano tube in the carbon nano tube cold cathode in the curing state to form a tip by utilizing a high-energy ion beam, and enabling the carbon nano tube to form an upright state by utilizing a high-strength electric field to obtain the carbon nano tube cold cathode in an activated state.

The invention relates to the technical field of ray detection, and particularly discloses a cold cathode ray machine digital control system based on high-frequency inversion and pulse modulation, which specifically comprises a master control and calculation module, a high-frequency high-voltage inversion and modulation module, a pulse driving and field emission control module and a precise sensing and acquisition module which are in communication connection with one another, a safety interlocking and state monitoring module; and a man-machine interface and communication module. According to the invention, a closed-loop control scheme of high-frequency inversion, pulse modulation and cathode state is provided for the first time, the problem of separation of independent operation of a power supply, a controller and an emitter of a traditional system is solved, and cross-module collaborative optimization is realized.

The application discloses a cold cathode ionization gauge driving and collecting circuit, and relates to the field of vacuum measurement, which solves the problems of signal conversion nonlinearity and excessive ion current when the gauge tube works at a lower vacuum degree in the existing cold cathode ionization gauge driving and collecting technology, and comprises the following parts: an ion current logarithmic collecting circuit, which is used for converting the ion current of the cold cathode ionization gauge into a voltage signal; a current monitoring circuit, which is used for generating a control signal according to the voltage signal; a voltage-controlled high-voltage driving circuit, which is used for driving the cold cathode ionization gauge according to the control signal; a nonlinear compensation operation conditioning circuit, which is used for performing nonlinear compensation on the voltage signal according to the control signal to obtain an operation collecting voltage; and the operation collecting voltage is used for inputting into a collecting system; the problem of signal conversion nonlinearity is overcome through the nonlinear compensation circuit, and the negative feedback loop control is performed through the current monitoring circuit and the voltage-controlled high-voltage driving circuit, so that the driving voltage of the gauge tube is reduced, and the maximum ion current is limited at a lower level.

The invention is suitable for the field of hot cathode ionization vacuum gauge filament life prediction and monitoring, and provides a novel ionization vacuum gauge hot cathode filament damage state monitoring device and method, and the device comprises a damage device and a state monitoring device. The damage device comprises a hand-cranking digital display sliding table, a first flange nut, a second flange nut, a third flange nut, a fourth flange nut, a short pressing plate, a first screw rod, a second screw rod, an iridium-yttrium oxide lamp filament, a cross-shaped sliding table, a long pressing plate, a bread board, a nut and a cutter fixing clamp. The state monitoring device comprises a molecular pump set, a vacuum valve, a cold cathode ionization vacuum gauge, a vacuum chamber, a hot cathode ionization vacuum gauge, a controller, an upper computer and a high-speed camera. The operation process of the damage system provided by the invention completely meets the requirement for damage to the coating width and the depth of the lamp filament, and the precision is relatively accurate. Moreover, the change of the surface of the lamp filament in the working process of the lamp filament can be observed, and real-time damage detection can be carried out on the lamp filament on the basis of processing image information in the experiment process.

The application belongs to the technical field of cold cathode trigger tube, and discloses a cold cathode trigger tube circuit simulation SPICE design method, which comprises the following steps: main gap channel design; trigger gap channel design; control module design; cold cathode trigger tube characteristic parameter verification and problem analysis; cold cathode trigger tube SPICE model improvement based on gas discharge theory and characteristic parameter verification; improved cold cathode trigger tube application simulation and result analysis. The cold cathode trigger tube SPICE model provided by the application meets the functions of the modern cold cathode trigger tube, and is verified by simulation; and different parameters of the model can be modified to meet the requirements of different scenes.

The embodiment of the present application provides a backscatter detection device and imaging method, equipment and storage medium. The method includes: using a cold cathode X-ray source to work in pulse mode, and modulating the pulsed rays into a fan-shaped ray beam through a front collimator component to solve the contradiction between scanning speed and image quality, and constraining the receiving range of the backscatter detector component to the backscatter photons through the collimation channel formed by the backscatter collimator component, and then the backscatter detector component receives the target backscatter photons passing through the collimation channel, and generates a backscatter electrical signal based on the target backscatter photons and transmits it to the processor, and the processor generates a backscatter image of the inspected object based on the backscatter electrical signal. It avoids the single-frame backscatter data from being affected by the jitter or movement of the detection device, and realizes instant scanning and high-quality dynamic imaging.

This invention discloses a novel welding machine, comprising: a welding frame, the welding frame including a support frame, a sealed door on the front of the support frame, a welding chamber at the upper end of the inner cavity of the support frame, and a welding table at the bottom of the inner cavity of the welding chamber. This invention belongs to the field of welding machine technology. The purpose of this invention is to solve the problems of traditional hot cathode electron beam welding machines in the prior art, where the hot cathode requires continuous preheating, has a long start-up time, and still needs to maintain a high temperature in standby mode. The technical effect achieved is: using a directional carbon nanotube array microbeam emitter as a cold cathode, utilizing the field emission principle of carbon nanotubes, an electric field is applied between the grid and the cathode to allow electrons to escape from the tip of the carbon nanotube through quantum tunneling effect, without heating the cathode to a high temperature, achieving millisecond-level instantaneous start-up, solving the drawback of traditional welding machines requiring 5-10 minutes of preheating, and significantly improving work efficiency and equipment response speed.

The present invention relates to the field of radiation imaging technology, and particularly to a multi-modal imaging device based on a cold cathode, including: an X-ray source module, a CT detection module, an ultrasonic detection module, an imaging module, a storage module, a control module, and a data analysis module. The data analysis module analyzes the initial image to obtain a sharpness comparison difference, determines the sharpness level of the initial image according to the sharpness comparison difference, and determines whether to perform a secondary scan on the ultrasonic detection module according to the sharpness level; based on performing the secondary scan, determines whether to adjust the power of the ultrasonic detection module according to the secondary scan result; determines whether to perform a region analysis according to the similarity level of the secondary image; determines the region similarity ratio based on the region analysis result, and adjusts the power of the X-ray source module according to the region similarity ratio. The present invention adjusts the scanning parameters according to the sharpness of different images to obtain a complete and clear scanning image.

A production method for producing an anode for a cold cathode X-ray source, including the following steps: producing an element referred to as target from a first material adapted to generating X-rays from the absorption of an electron beam, the first material having a first thermal expansion coefficient Ce,1(Tu) at a predetermined temperature Tu of use of the anode in the X-ray source, producing an element referred to as target support from a second material having a second thermal expansion coefficient Ce,2(Tu) at the predetermined temperature Tu, joining the target to the target support by hard soldering using a solder material at a soldering temperature higher than the predetermined temperature Tu and higher than a melting point of the solder material, so as to form a film of solder interposed between the target and the target support.

The invention discloses a gate structure composite nanometer cold cathode electron source and a manufacturing method thereof, the cold cathode electron source is sequentially provided with an electrode layer on a substrate, the electrode layer comprises a plurality of first electrodes and a plurality of second electrodes, and the first electrodes and the second electrodes are alternately arranged in parallel; the pre-growth layer thin film is arranged on the plurality of first electrodes and the plurality of second electrodes; and a composite nanometer cold cathode, wherein the composite nanometer cold cathode is arranged on the pre-growth layer thin film. The composite nanometer cold cathode electron source has the addressing driving capacity, by applying specific driving voltage to the electrode strips, grid cathode multiplexing can be achieved, and the service life of a device is prolonged. Meanwhile, the device structure has the self-alignment characteristic, the process is simple, and the device has important application prospects in the fields of addressable panel X-ray sources and the like.

The invention discloses a carbon nanotube cold cathode-based miniature vacuum relay and a pulse driving control method thereof, and belongs to the technical field of vacuum relays. The problem that the performance and the application range of an existing method are limited is solved, current, voltage, temperature and vacuum degree data are obtained in real time, deep analysis is conducted on the collected data through a neural network model, and optimal pulse parameters are accurately predicted; the output of the pulse generator is dynamically adjusted according to the predicted pulse parameters, so that the carbon nanotube cold cathode can stably and efficiently emit electrons, the performance of the relay is optimized, and the response speed and reliability of the relay are improved; meanwhile, the circuit state is monitored in real time, once abnormal conditions such as over-current, over-voltage or short circuit are detected, a protection mechanism is triggered immediately, a power supply is cut off or current / voltage is limited, an operator is reminded through an alarm signal, circuit damage is effectively prevented, and safe operation of the system is guaranteed.

The invention relates to an electron gun device of a radio frequency excitation gas discharge cold cathode electron beam coaxial fuse. Comprising a funnel-like anode internally provided with a water cooling channel, a cathode internally provided with an annular water cooling channel and connected with a high-voltage power supply, a wire feeding system, a gun top cover, a wire guide pipe and a radio frequency excitation gas discharge unit, the cathode is arranged in a transparent discharge chamber of the radio frequency excitation gas discharge unit, an annular discharge convex edge is arranged at the upper end of the anode, and the radio frequency excitation gas discharge unit excites gas ionization between the lower edge of the cathode in the discharge chamber and the annular discharge convex edge of the anode through a radio frequency antenna outside the discharge chamber; the gas ionization degree is adjusted by controlling the power of the radio frequency power supply, and the working pressure in the discharge chamber is reduced. According to the invention, the limitation that the stable output of the beam of the traditional beam coaxial cold cathode electron gun has strong dependence on air pressure and low working voltage is solved, and the process controllability and engineering application potential of electron beam fuse additive manufacturing are remarkably improved.

The application discloses a double-wire additive gun body based on cold cathode electron beam internal wire melting additive manufacturing, which comprises an anode, an insulator, an internal cathode, an external cathode, a ring-shaped wire nozzle, a discharge cavity, an upper joint plate, a wire guide pipe, a pipe for cooling the cathode and a high-voltage power supply; the anode is internally provided with the insulator, the lower middle part of the insulator is provided with the internal cathode, the external cathode is annular and connected with the lower part of the insulator; the insulator is internally provided with through holes for the two wire guide pipes, a water cooling channel, a gas feeding channel and a high-voltage power supply channel, the ring-shaped wire nozzle arranged at the lower end of the insulator is a conical tubular with a wide upper part and a narrow lower part, the pipe wall surface of the ring-shaped wire nozzle is provided with a wire feeding channel communicated with the wire guide pipe, the wire feeding double channels in the ring-shaped wire nozzle make the wire passing through point to the annular electron beam focal point, and the discharge cavity is formed between the internal cathode, the external cathode, the ring-shaped wire nozzle and the lower part of the anode shell. The application realizes multiple special functions of parts and adopts double wires to carry out internal wire melting additive manufacturing.

The invention belongs to the field of neutron tubes, and particularly relates to a carbon nanotube cold cathode ion source neutron tube and a logging method based on the neutron tube. The neutron tube comprises a tube shell assembly, a core column assembly, a carbon nano tube cold cathode ion source, an acceleration system, a tritium titanium target assembly and a storage device. The tube shell assembly is a vacuum sealing shell of the neutron tube; the core column assembly is connected with the carbon nano tube cold cathode ion source, the anode assembly and the storage device, and power is supplied to the carbon nano tube cathode, the anode and the storage device through electrode leads on the core column assembly. The method has the advantages that the carbon nano tube cold cathode ion source and the carbon nano tube cathode belong to field emission cathode materials, and the electron emission speed of the carbon nano tube cold cathode ion source and the carbon nano tube cathode is in a nanosecond level, so that the ionization speed and the neutron explosion time can be ensured to be less than 1 mu S, stratum information can be acquired according to a measurement time sequence during well logging, and the accuracy of the stratum information is ensured; in addition, due to the fact that the density of the carbon nano tube array is large, the density of generated ion beams is large, and the yield of emitted neutrons is high.

This application relates to the field of detection and discloses a cold cathode ray control method, device, medium, and product. The method includes: acquiring operating parameters and environmental parameters of a cold cathode device, and calculating equivalent cathode work function parameters; comparing the operating parameters, environmental parameters, and equivalent cathode work function parameters with preset target parameters in real time, and calculating control deviation values; using the control deviation values, equivalent cathode work function parameters, and operating parameters as input features, inputting them into a neural network control algorithm that constructs a physical constraint layer, calculating and outputting a gate drive signal and a focusing coil drive signal; calculating a voltage compensation amount based on the evolution trend of the equivalent cathode work function parameters, and using the voltage compensation amount to combine with the gate drive signal to generate a final drive command; applying the final drive command and the focusing coil drive signal to the cold cathode device, and repeating the above steps to ensure that the real-time acquired ray intensity meets the requirements of the preset target parameters.

The invention discloses a cold cathode ray detection control system, which comprises a ray tube with a cold cathode, a power supply module and a control module for modulating and boosting the power supply module and providing excitation X-rays for the ray tube for detection, and the control module comprises a master control and calculation module MCC, the master control and calculation module MCC is in bidirectional communication connection with a high-frequency high-voltage inversion and modulation module HFHI, a pulse driving and field emission control module FDEC, a precision sensing and acquisition module PSA, a safety interlocking and state monitoring module SISM and a man-machine interface and communication module HCI through a high-speed digital control bus. According to the invention, through algorithm optimization, the corresponding delay is suddenly reduced from the traditional 100us level to below 5us, the speed is obviously increased, and pulse-level real-time regulation and control can be realized; meanwhile, current and voltage precision adjustment is also remarkably improved, and accurate and stable output of dosage can be realized.

1. The name of the design product: compact cold cathode ray machine. 2. The use of the design product: the design product is a cold cathode ray machine. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention relates to a device and a method for manufacturing a heterogeneous alloy structure through ultrasonic regulation and control electron beam additive manufacturing, in particular to an electron beam additive manufacturing device for feeding wires through a main shaft and a shaft side and regulating and controlling element diffusion and phase generation in combination with an ultrasonic field effect and a forming method of the electron beam additive manufacturing device. According to the electron beam + double-wire + ultrasonic synergetic additive manufacturing method and system, in the wire bundle coaxial cold cathode electron beam fuse additive manufacturing process, an ultrasonic auxiliary system is introduced to act on a forming base plate, dynamic regulation and control over the heterogeneous alloy element mixing behavior and the structure evolution process in a molten pool are achieved, and therefore the mechanical performance of the molten pool is improved. The problems of coarse grains, uneven structures and performance fluctuation in the heterogeneous alloy deposition process are solved, structure refinement and component homogenization are achieved, and the overall service performance of a deposition component is improved.

The invention relates to the technical field of terahertz generators, in particular to a terahertz wave generator of a carbon nanotube-graphene heterojunction cold cathode, which comprises a contact part, a displacement device is slidably mounted at the side end of the contact part, and a heat dissipation fan is fixedly mounted at the top end of the contact part. The displacement device comprises a terahertz wave generator, connecting rods and a matching plate, the connecting rods are symmetrically and fixedly installed at the top end of the terahertz wave generator, the terahertz wave generator is fixedly installed at the side end of the matching plate, and the contact component comprises a butt joint device, a cleaning device, a shunting device, a positioning device and a supporting substrate. The positioning device is fixedly installed at the top of the side end of the supporting base plate, the flow dividing device is fixedly installed at the top end of the positioning device, and the butt joint devices are slidably installed on the two sides of the positioning device. Through the arrangement of the displacement device and the contact device, the purpose of integrating rapid installation and rapid cooling of the terahertz wave generator is achieved.

The invention provides a carbon nanotube cold cathode miniature vacuum sensor and a field emission current response detection method thereof, and relates to the technical field of micro-nano sensing and vacuum metrology, the sensor comprises an insulating substrate, a cold cathode array is arranged on the insulating substrate, an anode electrode is arranged on the insulating substrate through an insulating pillar corresponding to the cold cathode array, and the anode electrode is connected with the cold cathode array. A glass cover plate is arranged on the insulating substrate, the cold cathode array and the anode electrode are covered by the glass cover plate to form a vacuum cavity, and the cold cathode array and the anode electrode are connected with a signal acquisition and processing module; the method comprises the steps of applying pulse voltage, collecting field emission current, carrying out noise reduction processing on the collected field emission current, carrying out temperature compensation on the field emission current after noise reduction processing, and carrying out vacuum degree calculation based on the compensated field emission current. The vertical electric field configuration design and the deep learning algorithm are fused, the performance boundary of a traditional vacuum sensor is broken through, a good technical effect is achieved, and use is convenient.

A radiation source includes a radiation tube having a cathode which is a cold cathode. An imaging control unit directs the radiation source to intermittently and alternately emit the first radiation having a first energy distribution and the second radiation having a second energy distribution different from the first energy distribution whenever a rotation mechanism rotates the radiation source and a radiation detector by a preset angle. The imaging control unit directs the radiation detector to output a first projection image based on the first radiation and a second projection image based on the second radiation which are obtained by the intermittent emission of the first radiation and the second radiation. An image processing unit generates a tomographic image on the basis of the first projection image and the second projection image.