A portable steady-state or pulsed photonic radiation field measurement device and method

Abstract

The present application relates to a kind of portable steady-state or pulsed photon radiation field measuring device and method, by sequentially installing beam-limiting diaphragm, optical machine, controller from front to back in shell, the front end of beam-limiting diaphragm installs additional filter sheet;Optical machine includes X-ray tube, a group of deflection plate and a group of slit plate;And by the input of current voltage provided by controller for optical machine, the pulser in controller is connected with deflection plate by bias wire, to provide the required steady-state or pulsed photon radiation field type, obtains the corresponding steady-state or pulsed photon radiation field air kerma rate.The present application can solve the on-site calibration problem of place monitoring equipment, at the same time, the present application combines steady-state field and pulsed field on-site calibration device, to fill the gap of the verification of photon (X, gamma) place radiation monitoring equipment in nuclear power plant, spent fuel processing plant, environmental monitoring station and other nuclear-related places.

Description

Technical Field

[0001] This invention belongs to the field of metrology and measurement technology, specifically relating to a portable steady-state or pulsed photon radiation field measurement device and method. Background Technology

[0002] my country's nuclear power plants, spent fuel processing plants, environmental monitoring stations, and other critical nuclear-related sites are equipped with a large number of site radiation monitoring devices to ensure the radiation safety of on-site personnel. In accordance with current Chinese standards such as JJF 1733-2018 "On-site Calibration Specification for Fixed Environmental Gamma Radiation Air Keratin Rate Meters" and JJG 521-2006 "Verification Procedure for X-ray and Gamma Radiation Air Absorbed Dose Rate Meters for Environmental Monitoring," annual verification is mandatory to ensure the accuracy of site monitoring equipment, such as regional gamma monitors, critical alarm devices, and high-pressure ionization chambers.

[0003] To overcome the difficulties of heavy equipment, inconvenient disassembly, and difficult transportation, on-site verification is a more preferable approach. The radiation devices required for on-site verification typically fall into two categories: one is based on radioactive isotopes and shielding containers to provide a reference radiation field. As described in JJG 1733-2018, the radiation device needs to provide an air kerma rate range of (0.5–20) μGy / h, meaning the required isotope must be at least a Class V source. According to my country's GB 11806 "Regulations for the Safe Transport of Radioactive Materials," an application for road transport permits for radioactive materials must be obtained from the local public security department during the transport of the device, which takes a considerable amount of time. The other type is based on portable X-ray machines and shielding containers to provide a reference radiation field. Compared to isotopes, it poses no radiation hazard in standby mode and offers more options in terms of radiation energy, dose rate, and pulse field, making it the most suitable on-site verification method currently available.

[0004] However, among the current metrological verification devices in my country, only portable X-ray machines are proposed for site radiation monitoring equipment in steady-state fields, which is insufficient to meet the requirements for devices in JJG 1733-2018. Furthermore, my country has not yet developed metrological verification devices for site radiation monitoring equipment in pulsed fields. This poses significant challenges to the regular annual inspection of site monitoring equipment in nuclear-related sites. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a portable steady-state or pulsed photon radiation field measurement device and method. On the one hand, it can solve the problem of on-site calibration of site monitoring equipment. On the other hand, it adopts a new technical approach that combines steady-state field and pulsed field to fill the verification gap of site radiation monitoring equipment for photons (X, γ) in nuclear power plants, spent fuel processing plants, environmental monitoring stations and other nuclear-related sites.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a portable steady-state or pulsed photon radiation field measurement device, the main structure of which includes a shell, an optomechanical system, a beam-limiting aperture, an additional filter, and a controller, wherein...

[0007] The beam-limiting aperture, optomechanic, and controller are installed sequentially from front to back inside the housing, with the front end of the beam-limiting aperture protruding from the front surface of the housing;

[0008] The optical engine includes an X-ray tube, a set of deflection plates, and a set of slit plates. The X-ray tube contains a cathode filament and an anode tungsten target. The slit plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the anode tungsten target. The deflection plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the slit plates.

[0009] The beam-limiting aperture is a beam-limiting screen with a beam aperture, and the diameter of the photon inlet section of the beam aperture is consistent with the diameter of the photon outlet of the optomechanical system.

[0010] The additional filter is installed at the front end of the beam-limiting aperture, and the diameter of the additional filter is larger than the diameter of the photon exit section of the beam aperture.

[0011] The controller provides current and voltage input to the optomechanic. The pulse generator in the controller is connected to the deflection plate through a bias wire to provide the required type of steady-state or pulsed photon radiation field and obtain the air kerma rate of the corresponding steady-state or pulsed photon radiation field.

[0012] Furthermore, the outer casing is made of 304 stainless steel.

[0013] The deflection plate and slit plate are made of 304 stainless steel.

[0014] Furthermore, the slit plate is fixedly installed on the inner wall of the X-ray tube between the cathode filament and the anode tungsten target using insulating adhesive;

[0015] The deflection plate is fixedly installed on the inner wall of the X-ray tube between the cathode filament and the slit plate using insulating adhesive.

[0016] Furthermore, the slit spacing between the two slit plates and the polar spacing between the two deflection plates are designed according to the following formula:

[0017]

[0018] Where: l x It is half the minimum slit spacing; e is the electron charge; l y is the length of the deflection plate; U is the output voltage of the pulse generator; L is the distance between the two deflection plates; m is the electron mass; V is the maximum energy of the electron beam.

[0019] Furthermore, the controller includes a current and voltage control module, a sensor recording module, a value display module, and a control interface;

[0020] The current and voltage control module is connected to the high-voltage power grid to provide current and voltage input to the optomechanic, so as to provide the required steady-state radiation field or pulsed radiation field, and obtain the air kerma rate of the corresponding steady-state or pulsed radiation field according to the working curve of electron beam energy / electron beam flux intensity-air kerma rate of the device.

[0021] The sensor recording module has a built-in temperature sensor, humidity sensor, and air pressure sensor, and, in conjunction with a built-in correction algorithm, provides the display module with the conventional true value of the air kerma rate at the target location.

[0022] The control interface is connected to the current and voltage control module, the sensor recording module, and the value display module.

[0023] Furthermore, the beam-limiting aperture is made of tungsten alloy, and the thickness of the beam-limiting aperture is 3cm to 6cm.

[0024] Furthermore, the additional filter is made of aluminum with a thickness of 3.9 mm to 4.1 mm.

[0025] Furthermore, when photon rays for the steady-state field are generated, the current and voltage input to the optomechanism are adjusted by the transformer of the controller, providing the optomechanism with a continuously adjustable current and voltage input within the range of 60kV to 350kV and 0 to 20mA.

[0026] When photon rays for the pulsed field are generated, a deflection voltage U is provided by a pulse generator in the controller. The pulse generator provides square wave pulses with an amplitude of 0 to 500 kV and a pulse width that is continuously adjustable from 0.5 ms to 1 s.

[0027] Furthermore, the method for testing the electron beam energy / electron beam flux intensity-air kerma rate operating curve of the device is as follows:

[0028] Under the reference test conditions of the metrology standard laboratory, the steady-state radiation field air kerma rate corresponding to the photon rays emitted by the optomechanic with different electron ray energies and electron ray flux intensities to generate steady-state radiation fields was calibrated using a free air ionization chamber, and the corresponding steady-state radiation field electron ray energy / electron ray flux intensity-air kerma rate working curve was formed;

[0029] Under the reference test conditions of the metrology standard laboratory, the air kerma rate of the pulsed radiation field was determined when the optomechanic emitted photons with different electron beam energies and electron beam flux intensities to generate a pulsed radiation field using a free air ionization chamber. The working curve of electron beam energy / electron beam flux intensity-air kerma rate of the corresponding pulsed radiation field was formed.

[0030] The present invention also provides a portable method for measuring steady-state or pulsed photon radiation fields, implemented based on the aforementioned portable steady-state or pulsed photon radiation field measurement device, the method comprising the following steps:

[0031] S1. Perform metrological calibration on the steady-state radiation field and pulsed radiation field of the device, respectively.

[0032] S2. Based on the ambient temperature, humidity and air pressure conditions, the air kerma rate is corrected, and the conventional true value of the air kerma rate at the measurement point is given.

[0033] S3. A comprehensive evaluation is given to determine the uncertainty of the device;

[0034] S4. On-site verification of photon monitoring equipment.

[0035] The beneficial effects of this invention are as follows: Using the portable steady-state or pulsed photon radiation field measurement device and method provided by this invention, a beam-limiting aperture, an optomechanical system, and a controller can be sequentially installed in a housing from front to back. An additional filter is installed at the front end of the beam-limiting aperture. The optomechanical system includes an X-ray tube, a set of deflection plates, and a set of slit plates. The slit plates are fixedly installed between the cathode filament and the anode tungsten target of the X-ray tube, and the deflection plates are fixedly installed between the cathode filament and the slit plates. The controller provides current and voltage input to the optomechanical system. The pulse generator in the controller is connected to the deflection plates via bias wires to provide the desired type of steady-state or pulsed photon radiation field, thereby obtaining the air kerma rate of the corresponding steady-state or pulsed photon radiation field. This invention can solve the problem of on-site calibration of site monitoring equipment. At the same time, this invention adopts a new technical approach that combines steady-state field and pulse field to fill the verification gap of site radiation monitoring equipment for photons (X, γ) in nuclear power plants, spent fuel processing plants, environmental monitoring stations and other nuclear-related sites. It can be used for on-site verification of photon monitoring equipment such as regional γ detectors, critical alarm instruments, and high-pressure ionization chambers. Attached Figure Description

[0036] Figure 1 A schematic diagram of the main structure of a portable steady-state or pulsed photon radiation field measurement device provided for an embodiment of the present invention;

[0037] Figure 2 A cross-sectional view of a portable steady-state or pulsed photon radiation field measurement device provided for an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the optomechanical structure provided for an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the beam-limiting aperture structure provided for an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the controller logic structure provided for an embodiment of the present invention;

[0041] Figure 6 Flowchart of a portable steady-state or pulsed photon radiation field measurement method provided for embodiments of the present invention;

[0042] Among them, 1—outer shell, 2—handle, 3—optical engine, 4—beam limiting aperture, 5—additional filter, 6—beam port, 7—controller. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that in the description of the embodiments of the present invention, the terms "upper," "lower," "front," "rear," "front," "back," "left," "right," "horizontal," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] like Figure 1 , Figure 2 As shown, this embodiment provides a portable steady-state or pulsed photon radiation field measurement device. The main structure of the device includes a shell 1, a handle 2, an optomechanical system 3, a beam-limiting aperture 4, an additional filter 5, and a controller 7. The beam-limiting aperture 4, the optomechanical system 3, and the controller 7 are installed sequentially from front to back inside the shell 1. The front end of the beam-limiting aperture 4 protrudes from the front surface of the shell 1, and the additional filter 5 is installed at the front end of the beam-limiting aperture 4.

[0046] The dimensions of the outer casing 1 can be freely selected based on the choice of the X-ray machine 3, controller 7, and beam-limiting aperture 4; however, ease of vehicle transport should be considered, and the dimensions of the outer casing 1 should be as small as possible, less than 1.5m × 1.0m × 1.0m. The outer casing 1 is made of 2.5mm thick 304 stainless steel.

[0047] The handles 2 are welded to the left and right sides of the outer casing 1, and the weld points should be selected at the center of gravity of the device to facilitate lifting by the operator. The handles 2 are two 304 stainless steel handles; the outer side of the handles 2 is covered with anti-slip rubber.

[0048] like Figure 3 As shown, the optomechanical system 3 includes an X-ray tube, a set of deflection plates, and a set of slit plates. The X-ray tube contains a cathode filament and an anode tungsten target. The slit plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the anode tungsten target using insulating adhesive. Similarly, the deflection plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the slit plates using insulating adhesive. When the deflection voltage applied to the deflection plates is zero, the electrons emitted by the cathode filament can pass through the slits between the slit plates and reach the anode tungsten target.

[0049] The optomechanism 3 utilizes electrons emitted from the cathode filament in the X-ray tube. Under the traction of a vertical electric field, these electrons bombard the anode tungsten target at an incident angle of 15°–30°. Bremsstrahlung between the electrons and the anode tungsten target generates a steady-state photon radiation field, and the resulting photon beams exit from the photon exit port of the optomechanism 3 (i.e., the photon exit port of the X-ray tube). To achieve the required pulsed photon radiation field, in this embodiment, an additional set of deflection plates and a set of slit plates are added to the X-ray tube. The deflection plates are connected to the pulse generator in the controller 7 via bias wires. By adjusting the high voltage amplitude, pulse width, and waveform output by the pulse generator, periodic pulsed electron beams are achieved. Finally, the pulsed electron beams reaching the anode tungsten target through the slits between the slit plates are proportional to the quantized time period signal provided by the pulse generator, thereby achieving accurate measurement of the pulse period of the pulsed photon radiation field.

[0050] It should be noted that although the design dimensions of the deflection plate and slit are relatively flexible, it should be ensured that the horizontal electric field applied to the electron beam by the pulse generator through the deflection plate is sufficient to prevent all electrons from passing through the slit. The deflection plate and slit plate are made of 304 stainless steel, and their dimensions can be calculated according to the following formula.

[0051]

[0052] Where: l x It is half the minimum slit spacing; e is the electron charge; l yis the length of the deflection plate; U is the output voltage of the pulse generator; L is the distance between the two deflection plates; m is the electron mass; V is the maximum energy of the electron beam.

[0053] When designing the optical engine 3, the optical engine technical specifications required in Table 1 below must be met.

[0054] Table 1 Optical-mechanical technical specifications requirements

[0055]

[0056] Specifically, the structure of the beam-limiting aperture 4 is as follows: Figure 4 As shown, this is a beam-limiting screen with an aperture 6. The beam-limiting aperture 4 is fixed between the photon exit port of the optomechanical system 3 and the additional filter 5 to confine the emitted photons and reduce scattering of the radiation field. The diameter of the photon entrance section a of the aperture 6 is consistent with the diameter of the photon exit port of the optomechanical system 3. The diameter of the additional filter 5 is slightly larger than the diameter of the photon exit section b of the aperture 6.

[0057] In one specific embodiment, the beam-limiting aperture 4 is made of tungsten alloy, and the beam aperture 6 of the beam-limiting aperture 4 has an opening angle of 20°. The thickness of the beam-limiting aperture 4 is selected to be 3cm to 6cm.

[0058] Optionally, the additional filter 5 can be made of aluminum with a thickness of 3.9mm to 4.1mm, and its diameter can be slightly larger than the diameter of the photon emission port section b of the beam port 6.

[0059] Optionally, the logic function design of controller 7 is as follows: Figure 5 As shown, the main function of controller 7 is to control the portable steady-state or pulsed photon radiation field measurement device. Controller 7 includes a current-voltage control module, a sensor recording module, a value display module, and a control interface. On one hand, the current-voltage control module of controller 7 is connected to a high-voltage power grid to provide current and voltage input to the optomechanical device 3, thereby providing the required type of radiation field, i.e., a steady-state photon radiation field or a pulsed photon radiation field. Based on the device's electron beam energy / electron beam flux intensity-air kerma rate working curve, the air kerma rate of the corresponding steady-state or pulsed photon radiation field is obtained. On the other hand, the sensor recording module of controller 7 has built-in temperature, humidity, and air pressure sensors. Using the environmental condition information obtained from these sensors, combined with a built-in correction algorithm, it accurately provides the value display module with the agreed-upon true value of the air kerma rate at the target location for reference during on-site calibration.

[0060] The control interface of controller 7 is located on the back of housing 1. This interface is connected to the current and voltage control module, sensor recording module, and value display module, and displays the information provided by each module. The current and voltage control module calculates the electron beam energy and electron beam flux intensity emitted by optomechanical 3 when steady-state or pulsed photon radiation is generated based on the input steady-state current, steady-state voltage, and deflection voltage values. Then, based on the device's electron beam energy / electron beam flux intensity - air kerma rate working curve, it obtains the corresponding steady-state or pulsed photon radiation field's air kerma rate; that is, the control interface has the function of displaying the conventional true value of the radiation field's air kerma rate. Simultaneously, the device can achieve steady-state / pulsed field switching by selecting the deflection voltage value (zero point or U voltage point); the device can achieve ambient temperature, humidity, and air pressure display functions based on the information provided by the sensor recording module; and it combines the ambient temperature, humidity, and air pressure with a built-in correction algorithm to correct the air kerma rate of the steady-state or pulsed radiation field obtained by the current and voltage control module, providing the conventional true value of the air kerma rate at the target location.

[0061] The built-in correction algorithm is a correction algorithm formed by embedding the method of correcting the air kerma rate by the ambient temperature, humidity and air pressure conditions provided in ISO 4037 and GB / T 12162 into the controller 7.

[0062] Furthermore, the air kerma rate / dose rate conversion coefficient can be built into the controller 7 by industrial design technicians in the art, based on the conversion coefficient between air kerma rate and dose rate of monoenergetic photons given in GB / T12162.3, using a known industrial control program. This provides the air kerma rate / dose rate conversion function on the control interface. Simultaneously, each measurement record can be stored in the controller 7 using a known industrial control program, providing a historical usage record viewing function.

[0063] In this embodiment, the steady-state field and steady-state radiation field both refer to the steady-state photon radiation field, and the pulse field and pulse radiation field both refer to the pulse photon radiation field.

[0064] Specifically, controller 7 is connected to the high-voltage power grid. When photon rays for steady-state fields are generated, the transformer in controller 7 adjusts the current and voltage required for the input optomechanical 3, providing the optomechanical 3 with a continuously adjustable input current and voltage within the range of 60kV to 350kV and 0 to 20mA. When photon rays for pulsed fields are generated, the pulse generator in controller 7 provides a deflection voltage U. The pulse generator provides square wave pulses with an amplitude of 0 to 500kV and a pulse width that is continuously adjustable within the range of 0.5ms to 1s.

[0065] Specifically, before using the device, it is necessary to test the working curve of the electron beam energy / electron beam flux intensity-air kerma rate of the device: Under the reference test conditions of the metrology standard laboratory, when the free air ionization chamber calibration optomechanism 3 used for X-ray absolute measurement emits photon beams with different electron beam energies and electron beam flux intensities to generate a steady-state radiation field, the corresponding steady-state radiation field air kerma rate is measured, and a working curve of electron beam energy / electron beam flux intensity-air kerma rate for the corresponding steady-state radiation field is formed. Under the reference test conditions of the metrology standard laboratory, when the free air ionization chamber calibration optomechanism 3 used for X-ray absolute measurement emits photon beams with different electron beam energies and electron beam flux intensities to generate a pulsed radiation field, the corresponding pulsed radiation field air kerma rate is measured, and a working curve of electron beam energy / electron beam flux intensity-air kerma rate for the corresponding pulsed radiation field is formed.

[0066] The working principle of the device is as follows:

[0067] (1) For steady-state radiation field: By adjusting the current and voltage required for input to optomechanical 3 through the transformer in controller 7, the energy of electron beam emitted by optomechanical 3 and the electron beam flux intensity when steady-state field photon beam is generated can be calculated. Then, according to the working curve of electron beam energy / electron beam flux intensity-air kerma rate of the device, the air kerma rate of the corresponding steady-state radiation field can be obtained.

[0068] (2) For pulsed radiation field: By inputting the required current and voltage of the optomechanical 3 through the regulating transformer in the controller 7 and the deflection voltage generated by the pulse generator, the energy of the electron beam emitted by the optomechanical 3 and the electron beam intensity when the photon beam of the pulsed field is generated can be calculated. Then, according to the working curve of electron beam energy / electron beam intensity-air kerma rate of the device, the air kerma rate of the corresponding pulsed radiation field can be obtained.

[0069] like Figure 6 As shown, this embodiment also provides a portable steady-state or pulsed photon radiation field measurement method, implemented based on the aforementioned portable steady-state or pulsed photon radiation field measurement device. The method includes the following steps:

[0070] S1. Perform metrological calibration on the steady-state radiation field and pulsed radiation field of the portable steady-state or pulsed photon radiation field measuring device, respectively.

[0071] Specifically, for the steady-state radiation field, it is necessary to measure the air kerma rate, radiation field, photon energy, and device repeatability at 1m, 2m, 3m, 4m, and 5m.

[0072] For pulsed radiation fields, in addition to the physical quantities mentioned above, further measurements of the pulse period and the air kerma rate within a single pulse are required.

[0073] S2. Based on the ambient temperature, humidity and air pressure conditions, the air kerma rate is corrected, and the conventional true value of the air kerma rate at the measurement point is given.

[0074] The air kerma rate is corrected according to the built-in correction algorithm in controller 7 (the method for correcting the air kerma rate based on the ambient temperature, humidity and air pressure conditions provided in ISO 4037 and GB / T 12162). The control interface of controller 7 displays the conventional true value of the air kerma rate at the measurement point.

[0075] S3. A comprehensive evaluation is given to determine the uncertainty of the device;

[0076] S4. Conduct on-site verification of photon monitoring equipment such as regional gamma detectors, critical alarm instruments, and high-pressure ionization chambers.

[0077] During on-site verification, the portable steady-state or pulsed photon field radiation measurement device needs to be equipped with a three-dimensional adjustable trolley device to adjust the horizontal position, vertical height and pitch angle of the device; and a horizontal and vertical laser positioner should be equipped at the output port of the device to facilitate the rapid positioning of the center point of the emitted photon beam of the radiation field during the calibration process.

[0078] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention is also intended to include these modifications and variations.

Claims

1. A portable steady-state or pulsed photon radiation field measurement device, characterized in that, The main structure of the device includes a shell, an optomechanical system, a beam-limiting aperture, an additional filter, and a controller. The beam-limiting aperture, optomechanic, and controller are installed sequentially from front to back inside the housing, with the front end of the beam-limiting aperture protruding from the front surface of the housing; The optical engine includes an X-ray tube, a set of deflection plates, and a set of slit plates. The X-ray tube contains a cathode filament and an anode tungsten target. The slit plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the anode tungsten target. The deflection plates are fixedly installed on the inner wall of the X-ray tube between the cathode filament and the slit plates. The beam-limiting aperture is a beam-limiting screen with a beam aperture, and the diameter of the photon inlet section of the beam aperture is consistent with the diameter of the photon outlet of the optomechanical system. The additional filter is installed at the front end of the beam-limiting aperture, and the diameter of the additional filter is larger than the diameter of the photon exit section of the beam aperture. The controller provides current and voltage input to the optomechanic. The pulse generator in the controller is connected to the deflection plate through a bias wire to provide the required type of steady-state or pulsed photon radiation field and obtain the air kerma rate of the corresponding steady-state or pulsed photon radiation field. The slit spacing between the two slit plates and the polar spacing between the two deflection plates are designed according to the following formula: Where: l x It is half the minimum slit spacing; e is the electron charge; l y is the length of the deflection plate; U is the output voltage of the pulse generator; L is the distance between the two deflection plates; m is the electron mass; V is the maximum energy of the electron beam.

2. The portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, The outer shell is made of 304 stainless steel. The deflection plate and slit plate are made of 304 stainless steel.

3. The portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, The slit plate is fixedly installed on the inner wall of the X-ray tube between the cathode filament and the anode tungsten target using insulating adhesive. The deflection plate is fixedly installed on the inner wall of the X-ray tube between the cathode filament and the slit plate using insulating adhesive.

4. A portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, The controller includes a current and voltage control module, a sensor recording module, a value display module, and a control interface; The current and voltage control module is connected to the high-voltage power grid to provide current and voltage input to the optomechanic, so as to provide the required steady-state radiation field or pulsed radiation field, and obtain the air kerma rate of the corresponding steady-state or pulsed radiation field according to the working curve of electron beam energy / electron beam flux intensity-air kerma rate of the device. The sensor recording module has a built-in temperature sensor, humidity sensor, and air pressure sensor, and, in conjunction with a built-in correction algorithm, provides the display module with the conventional true value of the air kerma rate at the target location. The control interface is connected to the current and voltage control module, the sensor recording module, and the value display module.

5. A portable steady-state or pulsed photon radiation field measurement device according to claim 4, characterized in that, The method for testing the electron beam energy / electron beam flux intensity-air kerma rate operating curve of the device is as follows: Under the reference test conditions of the metrology standard laboratory, the steady-state radiation field air kerma rate corresponding to the photon rays emitted by the optomechanic with different electron ray energies and electron ray flux intensities to generate steady-state radiation fields was calibrated using a free air ionization chamber, and the corresponding steady-state radiation field electron ray energy / electron ray flux intensity-air kerma rate working curve was formed; Under the reference test conditions of the metrology standard laboratory, the air kerma rate of the pulsed radiation field was determined when the optomechanic emitted photons with different electron beam energies and electron beam flux intensities to generate a pulsed radiation field using a free air ionization chamber. The working curve of electron beam energy / electron beam flux intensity-air kerma rate of the corresponding pulsed radiation field was formed.

6. A portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, The beam-limiting aperture is made of tungsten alloy and has a thickness of 3 cm to 6 cm.

7. A portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, The additional filter is made of aluminum with a thickness of 3.9 mm to 4.1 mm.

8. A portable steady-state or pulsed photon radiation field measurement device according to claim 1, characterized in that, When photon rays for steady-state fields are generated, the current and voltage input to the optomechanism are adjusted by the transformer of the controller, providing the optomechanism with a continuously adjustable current and voltage input within the range of 60kV to 350kV and 0 to 20mA. When photon rays for the pulsed field are generated, a deflection voltage U is provided by a pulse generator in the controller. The pulse generator provides square wave pulses with an amplitude of 0 to 500 kV and a pulse width that is continuously adjustable from 0.5 ms to 1 s.

9. A portable method for measuring steady-state or pulsed photon radiation fields, implemented based on the portable steady-state or pulsed photon radiation field measuring device according to any one of claims 1-8, characterized in that, The method includes the following steps: S1. Perform metrological calibration on the steady-state radiation field and pulsed radiation field of the device, respectively. S2. Based on the ambient temperature, humidity and air pressure conditions, the air kerma rate is corrected, and the conventional true value of the air kerma rate at the measurement point is given. S3. A comprehensive evaluation is given to determine the uncertainty of the device; S4. On-site verification of photon monitoring equipment.

Images