CN103762007B - Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system - Google Patents
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system Download PDFInfo
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Abstract
The present invention is a kind of based on the x-irradiation system that electron linear accelerator is electron beam source, join the extension radiation protection room of two-dimensional scan deflection coil magnet ring and overlarge area transmission-type x-ray conversion target and band laterally Zigzag type sample transport mechanism the most repeatedly, can be used for other article needing ionizing radiation irradiation sterilization pesticide and disinfectant to process to Chinese patent medicine and food flowers etc. and be back to back sample automatization radiation treatment.The present invention has that emission conversion efficiency is high, radiant intensity big, and radiation penetration power is strong, continuous irradiation can automatically pass in and out sample, and irradiation dose uniformity is good, and system radiation protection is good, there is not the advantages such as the relevant environmental threat of radionuclide.The present invention can be used for substituting the most widely used radioactive nucleus irradiation apparatus, thus finally thoroughly breaks away from the dependence to nuclear radiation source of the irradiation industry, eliminates and environment is produced the potential threat that radioactive nucleus pollutes.
Description
Technical field
The invention mainly relates to a kind of novel ionizing radiation irradiation special equipment, particularly relate to a kind of electron linear accelerator two-dimensional scan high-energy X-ray irradiation system, belong to ionizing radiation irradiation apparatus technical field.
Background technology
Utilize the strong penetrance of ionizing radiation and the irradiation dose biological effect to organism, the mankind start extensively nuclear radiation technology to be applied to such as from last century along with peaceful utilization of atomic energy slogan: chemical plastic is modified, food fresh keeping, sterilisation of objects sterilizing pesticide, irradiated biological effect study, treatment of blood products (preventing transfusion reaction) etc. various applications, also obtain very great society economic benefit.Irradiation nuclear radiation source thus be widely used, especially in food fresh keeping, in sterilisation of objects sterilizing pesticide irradiation, the large-scale nuclear radiation station with high activity Co60 as irradiation bomb is the most relatively commonly used in each provinces and regions of China at present.Due to the uncontrollable characteristic of radioprotective, nuclear radiation source is manufacturing, and transport produces the radiation to surrounding after storing and finally scrapping the most always.Natural radioactive decay due to radionuclide, needed for nuclear radiation equipment, exposure time i.e. must the most constantly extend after dispatching from the factory, when reaching the nucleic half-life, (if Co60 is 5.3 years), exposure time must increase by 1 times, the radioactive source that before eventually scrapping with used time long needs, radioactive source more renews.And the production of radioactive source, transport, store, change and the process of Spent Radioactive Source, all surrounding people may cause safely radioprotective endanger.There is card source accident in nuclear radiation station, several years front Henan, unexpectedly causes social group's event that numerous residents' large area is fled from, it is simply that a fresh and alive case.So the public of environmental conservation personage and the protection of vast environment of interest is desirable that by various legislations, from the beginning using nuclear radiation source as having the dangerous materials strictly management and control that environment produces radioactive nucleus pollution potential threat.Along with the continuous reinforcement of Public environmental attitude, and the serious consequence of the nuclear matter leakage accident occurred produces baneful influence, and this management and control is also constantly being strengthened.Since the eighties in last century, the ionizing radiation that people start with controlled ionizing radiation technology such as accelerator and Roentgen apparatus produce substitutes radioprotective for irradiation industry, wish finally thoroughly to break away from the dependence to nuclear radiation source, eliminate and environment is produced radioactive nucleus pollution potential threat.But, the irradiation electron accelerator of current comparative maturity is the most also used in directly utilizing electron beam and carries out the chemical plastic industry of irradiation.Although high-power electron beam can form high irradiation dose on photographed object surface, but owing to electron range is limited, although irradiation width can be expanded by scanning technique, also it is only used for that the one fixed width limited thickness plastics chemical materials in advancing is made top layer continuous irradiation and processes.For needing the demand of the irradiation such as the food fresh keeping to the degree of depth suitable in bigger packaging and sterilisation of objects sterilization and disinsection, accelerator electron beam irradiation cannot meet and directly use, and user must rely on the Co60 gamma radiation device with strong penetrating power.
Analyze theoretically, several million to tens of megavolts level high-power electron beams can be converted to the high-energy X-ray photon radiation of energy number million to tens of million electro-volts when bombarding metallic target, its conversion efficiency is significantly larger than the x-ray generation equipment of current hundred KV levels, and the average penetration power of its x-ray radiation photon produced also is far above the gammaphoton penetration capacity of Co60.But owing to the isotropism irradiation with radioactive nucleus gamma ray is different, also the x-ray produced with common tens of kilovolt hundred kilovolt electrons has the angular distribution difference of bigger irradiation, after this high-energy X-ray photon produces, be nearly all close towards direction fly with the incident electron direction of angle of major part radiates, irradiation angle is less, it is impossible to simply and effectively for bigger packaging sample irradiation.Additionally due to produced high-energy X-ray penetration capacity is extremely strong, the Radiation Protection of equipment is complicated far beyond electron linear accelerator, it is limited to technology development restriction, current electron accelerator manufacturer also fails to make enough Technical investment in the research and development of high-energy X-ray irradiation system, enabling the product of the high-energy X-ray irradiation system substituting high activity Co60 nuclear radiation station also fails to so far to be occurred and arrive in user's hands.And due to environmental protection requirement, each state is all limiting the inlet and outlet of nuclear radiation source apparatus, this present situation certainly will have impact on the popularization of irradiation technique application.
The present invention produces according to the research of this technical background.On the basis of the thinking of novel radiation special transmission-type direct water-cooling anode super large focus X-ray spool (number of patent application 201210302279.X), inventor brings up to 10-20 million electro-volt beam energy, utilize current irradiation electron linear accelerator to irradiate heavy metal target as high-power electron beam source and produce high-energy X-ray radiation, be greatly improved x-ray energy conversion efficiency and photon energy penetration capacity and the irradiation dose intensity formed；The one-dimensional scanning that current electron accelerator is used changes the two-dimensional scan that similar television vacuum image reproducer uses into, thus obtain the electron beam irradiation open country of overlarge area, mix overlarge area transmission-type x-ray conversion target, effectively solve high energy bremsstrahlung shooting angle little, the problem that irradiation face is little.The advantage strong in order to make full use of high-energy X-ray penetration power, make full use of the high-energy X-ray irradiation energy after penetrating sample bag, the radiation protection room designed suitable irradiation direction supporting and stretch, solve radiation of equipment protection question, and it is equipped with Zigzag type sample transport mechanism repeatedly in radiation protection indoor, solve continuous irradiation state sample automatically to pass in and out and sample packaging internal irradiation dose uniformity sex chromosome mosaicism, ultimately form the present invention " electron linear accelerator two-dimensional scan high-energy X-ray spoke system ", can effectively substitute at present also at the widely used nuclear radiation station with Co60 as irradiation bomb.
Along with environmental protection consciousness constantly strengthens in the whole world, the research and development to greatly developing irradiation specific high-energy x-ray equipment of the irradiation industry commonly used present situation in terms of food Chinese patent medicine and biological product irradiation propose tight demand, require finally thoroughly to break away from the dependence to nuclear radiation source, eliminate and environment is produced radioactive nucleus pollution potential threat.The present invention solves irradiation industry just and breaks away from the effective new product relying on radionuclide source.
Summary of the invention
Goal of the invention
The present invention proposes high-energy X-ray irradiation system based on irradiation electron linear accelerator and the sample inlet/outlet mechanism structure design of supporting radiation protection room automatization of a kind of innovation, apply for big irradiation dose irradiation industry, purpose is to substitute present wide variety of Co 60 or Ce 137 radioactive nucleus irradiation devices, to eliminate, environment is produced radioactive nucleus pollution potential threat, increase substantially service efficiency and the disposal ability of existing nuclear radiation equipment, thus finally thoroughly break away from the dependence to radioactive nucleus irradiation bomb of each relevant irradiation industry.
Technical scheme
The present invention is achieved through the following technical solutions:
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system, including electron accelerator and appended two-dimensional scan deflection coil magnet ring, transmission-type x-ray conversion target, extend radiation protection room, Zigzag type sample transport mechanism the most repeatedly, it is characterized in that: electron accelerator is in Horizontal type, vacuum pipe periphery before its electron beam exit wound of bullet titanium window is provided with two-dimensional scan deflection coil, transmission-type x-ray conversion target that is that be provided with the long rectangle that large area horizontal direction is major axis at a certain distance from electron beam exit wound of bullet titanium central shaft outside window and that parallel with electron beam exit wound of bullet titanium window face, it is connected by tubaeform auxiliary vacuum protective cover between electron beam exit wound of bullet titanium window and transmission-type x-ray conversion target；From the position of transmission-type x-ray conversion target, the sub-central beam axis of para-electric extend as central shaft, be provided with inner space section be horizontal direction be the extension radiation protection room of the long rectangle of major axis；It is placed in is extended on the bottom surface that radiation protection is indoor by sample inlet conveyer belt, the multiple sample relaying Zigzag type sample transport mechanism the most repeatedly that conveyer belt, multiple sample turn to rotating disk, multiple transition pad and sample export conveyer belt to form of turning back, import conveyer belt be connected with outside with guard chamber outlet by the guard chamber injection port being opened on the sidewall of extension radiation protection room respectively with outlet conveyer belt.
Tubaeform auxiliary vacuum relief cover outer wall is made up of the lead and support cladding aluminium alloy meeting radiation protection requirement adequate thickness, connects and clads the space between electron beam exit wound of bullet titanium window and transmission-type x-ray conversion target.
Transmission-type x-ray conversion target target surface is perpendicular with electron beam central axis, target surface is centrally located on electron beam exit wound of bullet titanium central shaft outside window, distance between transmission-type x-ray conversion target and electron beam exit wound of bullet titanium window makes electron beam scan area height on target be equal to be illuminated sample outer package height, and scanning plane width is sample outer package width 8-10 times；Transmission-type x-ray conversion target is shaped as the long rectangle that horizontal direction is major axis, area is slightly larger than position electron beam scanning area, the one side facing electron impact is made up of the high atomic number simple metal diaphragm slightly larger than incident electron range, the back side is supported slightly larger than the thickness of secondary electron range by high-termal conductivity lower atomic number metals material, and backing material is cooled down by circulating water flow or uses the most air-cooled.
Extend radiation protection room inner space section be horizontal direction be the long rectangle of major axis, the width of interior section and height are respectively greater than width and the height of transmission-type x-ray conversion target, from the position of transmission-type x-ray conversion target, the sub-central beam axis of para-electric stretches and stretches outside central axial, and the horizontal width of interior section is the most slightly widened and is highly held essentially constant；Extend respectively facing the wall and meditating of radiation protection room to be built up by concrete；Offer guard chamber injection port near transmission-type x-ray conversion target position extending in one, radiation protection room side walls, with its at a distance of multiple samples relaying turn back conveyer belt width distance and position identical faces sidewall on be further opened with guard chamber outlet；The width of guard chamber injection port and guard chamber outlet is slightly larger than the width of conveyer belt, and height slightly above transmits the height of sample.
When extending the semi-underground design that radiation protection room employing electron beam central axis is less than below Earth surface plane, utilize natural rock or soil layer Substitute For Partial wall thickness.
Laterally Zigzag type sample transport mechanism is turned to rotating disk, multiple transition pad and outlet conveyer belt to form by turn back conveyer belt, multiple sample of import conveyer belt, multiple sample relaying the most repeatedly, is placed in extension radiation protection indoor, is distributed in whole bottom surface；Import conveyer belt, sample relay turn back conveyer belt and the outlet the most parallel close-packed arrays of conveyer belt, and each conveyer belt direction of transfer is all vertical with electron beam central axis extension line；Each conveyer belt width is identical, and slightly larger than transmitting sample outer package dimensions, conveyer belt transmission plane is identical with extending radiation protection room floor height, and each conveyer belt transmits linear velocity and remained identical by synchronous motor manipulation；It is contrary that adjacent conveyer belt transmits surface traffic direction；Each sample turns to rotating disk to be crisscross arranged at the two ends of adjacent conveyor belts respectively, connection adjacent conveyor belts, sample turns to rotating disk radius slightly larger than conveyer belt width, turntable surface is all in substantially the same plane with conveyer belt transmission plane, and velocity of rotation is manipulated by synchronous motor and remain that on turntable surface, the linear velocity of radius 1/2 position is slightly faster than each conveyer belt transmission linear velocity；The length and width of transition pad is equal to conveyer belt width, is placed in each conveyer belt termination and turns to rotating disk phase joining place and hide half turntable surface, being fixed on slightly above turntable surface plan-position.
Utilize current 10-20 megavolt of electron linear accelerator of chemical industry irradiation to originate as high-power electron beam, irradiate heavy metal target and produce high-energy X-ray radiation, be greatly improved x-ray energy conversion efficiency and photon energy penetration capacity and the irradiation dose intensity formed.
The one-dimensional scanning that current electron accelerator is used changes the two-dimensional scan that similar television vacuum image reproducer uses into, by tubaeform excessive vacuum room, the transmission-type x-ray conversion target being target surface material with high atomic number simple metal is set in the electron beam the most sufficiently large distance of output titanium, thus the electron beam irradiation obtaining overlarge area is wild.The overlarge area transmission-type x-ray conversion target configured just becomes the high-energy X-ray radiation source of overlarge area direction forward radiation under high-energy electron beam scanning irradiates, and the bremstrahlen x-ray radiation angle effectively solving high-power electron beam generation is little, the defect that irradiation field area is little.
The advantage strong in order to make full use of high-energy X-ray penetration power, make full use of the high-energy X-ray irradiation energy after penetrating top layer sample bag, the extension radiation protection room designed suitable irradiation direction supporting and stretch, and it is equipped with Zigzag type sample transport mechanism the most repeatedly extending radiation protection indoor, the Radiation Protection of solution system and needing under continuous irradiation duty is illuminated sample and automatically passes in and out the problem of radiation protection room, and each is illuminated sample packaging internal irradiation dose uniformity sex chromosome mosaicism.Making to be illuminated sample and can enter in radiation protection room, and operation of repeatedly turning back in guard chamber autobiography repeatedly by Automatic continuous, enable to be illuminated sample and be full of whole radiation chamber space, the emittance of system is utilized.Ultimately form the present invention " electron linear accelerator two-dimensional scan high-energy X-ray spoke system ".
Advantage and effect
Owing to using structure and the working method of above-mentioned innovation, comparing with common X-ray irradiator, particularly compared with radioactive nucleus irradiation bomb kind of blood exposing machine, the obvious advantage of the present invention with application effect is:
(1), emission conversion efficiency is high: by x-ray radiation physics basic theories, electron beam is converted to the energy conversion efficiency of X-ray by heavy metal target and is approximately proportional to electronics and is accelerated energy and target atom ordinal number.So 20 million electro-volts of accelerators, the efficiency being converted to x-ray energy on same target is higher than 200 Kilovoltage X-ray emitters 100 times.Specifically, if the beam energy power of 10 kilowatts, always produce x-ray energy work rate with 200 Kilovoltage X-ray equipment and be about 0.04 kilowatt, be then placed on 20 million electro-volts of electron beams and can produce x-ray energy work rate at same target and then can reach about 4 kilowatts.The employing of the present invention will make X-radiation conversion efficiency increase substantially than existing x-irradiation machine (most employing 160kV tube voltage) level.
(2), sample penetration power is greatly enhanced by ray, available irradiation field volume increases: by radiation physics basic theories, the penetration capacity of material is depended on photon energy and material density composed atom ordinal number by x-ray photon or gamma ray photon, when material density and composed atom ordinal number are constant, the penetration capacity of material is increased with photon energy and increases by photon.And x-ray radiation photon energy is directly determined by incident electron energy, the maximum photon energy of x-ray power spectrum continuous distribution is substantially equal to incident electron energy, the ceiling capacity of the x-ray photon i.e. produced in the present invention is more than 100 times that common X-ray irradiation apparatus (160 kilovolts of grades) produces the ceiling capacity of x-ray photon, also ratio Co60, big 10-20 times of Cs137 gammaphoton energy, so sample penetration power is greatly enhanced by ray, suitable radiant intensity is also maintained through the x-ray after previous sample, available irradiation field extends volume ratio common X-ray irradiation devices or Co60 nuclear radiation source will be big.
(3), total radiation intensity is big: be significantly larger than common X-ray equipment owing to high-power electron beam is converted to the energy conversion efficiency of x-ray, add, radiation with common X-ray source has different compared with large radiation angle, high-energy X-ray is mostly concentrated along electron impact direction smaller angle forward directed radiation, so the electrical power of same input, it is used in x-ray radiation overall strength common X-ray the to be far longer than device that high-energy electron accelerator Transmission X line target obtains at sample and can be generated by total radiation intensity.Even if having weakened owing to using scan mode to make unit are target send radiant intensity, also big more than 100 times of the x-ray radiation intensity produced than same power common X-ray irradiation devices (even using transmission anode technology) from irradiation intensity suffered by target same distance sample, the radiation dose rate produced under identical electrical power greatly increases than existing x-irradiation equipment.
(4) a series of environmental issues brought with radioactive nucleus material, are broken away from: compared with now widely used radioactive nucleus irradiation apparatus, the popularization and application of the present invention and it is substituted, the fully controllable of ionizing radiation will be realized and thoroughly break away from the dependence to radioactive nucleus material, avoid regulating the traffic of nuclear radioactive source and store replacing and the process of useless source etc. a series of thorny problems that can cause environment activity nuclear pollution that expire, also eliminate the trouble constantly extending exposure time with Radioactive Source Decay simultaneously.This realizes the environmental protection strategy of sustainable development for us and has far-reaching strategic importance.
(5), automated operation efficiency is high, can be realized being back to back under Continuous irradiation sample automation mechanized operation: the present invention supporting employing in extension radiation protection room is a set of so that two sets laterally Zigzag type sample transport mechanism the most repeatedly, and solution system needs to be illuminated sample under continuous irradiation duty and automatically passes in and out the problem of radiation protection room and each be illuminated sample packaging internal irradiation dose uniformity sex chromosome mosaicism.It is also possible to the irradiation system that design-build is the same radiation treatment that can simultaneously carry out two kinds of irradiation dose samples of height, there is stronger irradiation function and the versatility of two kinds of irradiation rating sample turnover automation mechanized operations under Continuous irradiation.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Wherein: 1, electron accelerator, 2, electron beam exit wound of bullet titanium window, 3, two-dimensional scan deflection coil magnet ring, 4, transmission-type x-ray conversion target, 5, tubaeform auxiliary vacuum protective cover, 6, extend radiation protection room, 7, sample inlet conveyer belt, 8, sample export conveyer belt, 9, sample relaying is turned back conveyer belt, 10, sample turn to rotating disk, 11, excessive pad, 12, guard chamber injection port, 13, guard chamber outlet.
Detailed description of the invention
The present invention is described further below in conjunction with the accompanying drawings:
The invention belongs to the innovation of ionizing radiation irradiation apparatus; i.e. substitute the uncontrollable radioactive nucleus irradiation bomb equipment having environment generation radioactive nucleus pollution potential threat of its most widely used radiation, to protect environment for human survival by the high-energy and high-efficiency x-ray irradiation system not producing the pollution of environment activity nuclear matter of controlled special Irradiation Design exploitation.
The present invention be aiming at existing with radioactive nucleus be irradiation bomb nuclear radiation equipment and the technology path that done with the various deficiencies existing for irradiation x-ray equipment that industrial x-ray source is irradiation bomb change, manufacture and design for special efficient high intensity radiation x-irradiation equipment and open up a full technical strategies.Make full use of the product technology of existing electron linear accelerator according to radiation physics principle and existing irradiation apparatus done four aspect material alterationses:
(1) current 10-20 megavolt of electron linear accelerator of chemical products irradiation is used to originate as high-power electron beam, the Transmission X line conversion target made by irradiating heavy metal target produces high-energy X-ray and radiates, make that the ceiling capacity of the x-ray photon of generation is that common X-ray irradiation apparatus (160 kilovolts of grades) produces the ceiling capacity of x-ray photon more than 100 times, also big 10-20 times of Co60, Cs137 gammaphoton energy of ratio, beam energy is converted to bigger than 200 Kilovoltage X-ray devices 100 times of the efficiency of x-ray energy, and the x-ray radiation intensity of generation also wants big more than 100 times.
(2) one-dimensional scanning that current irradiation electron accelerator is used changes the two-dimensional scan that similar television vacuum image reproducer uses into, by tubaeform excessive vacuum room, in the electron beam the most sufficiently large distance of output titanium, the transmission-type x-ray conversion target being target surface material with high atomic number simple metal is set, thus obtain the high-energy X-ray radiation source of the overlarge area direction forward radiation of the electron beam irradiation open country of overlarge area, the bremstrahlen x-ray radiation angle effectively solving high-power electron beam generation is little, the defect that irradiation field area is little.
(3) advantage strong in order to make full use of high-energy X-ray penetration power, makes full use of the high-energy X-ray irradiation energy after penetrating top layer sample bag, has designed suitable irradiation direction supporting and has extended radiation protection room；
(4) in the radiation protection room extended, supporting employing is a set of or two sets laterally Zigzag type sample transport mechanism the most repeatedly, make one or two kind of irradiation dose demand sample respectively one connect one run in successively rotate and turn back, tight distribution is indoor in whole radiation protection.Solution system needs to be illuminated sample under continuous irradiation duty and automatically passes in and out radiation protection room and each sample packaging internal irradiation dose uniformity sex chromosome mosaicism that is illuminated, and improves running efficiency of system.
Embodiment:
Fig. 1 is the present invention " electron linear accelerator two-dimensional scan high-energy X-ray spoke system " structural representation；
As seen from Figure 1: electron linear accelerator two-dimensional scan high-energy X-ray irradiation system includes electron accelerator 1 and appended two-dimensional scan deflection coil magnet ring 3, transmission-type x-ray conversion target 4, extend radiation protection room 6, Zigzag type sample transport mechanism the most repeatedly, its architectural feature is: electron accelerator 1 main body is in Horizontal type, vacuum pipe periphery before its electron beam exit wound of bullet titanium window 2 is provided with two-dimensional scan deflection coil magnet ring 3, at a certain distance from the electron beam outer central shaft of exit wound of bullet titanium window 2, transmission-type x-ray conversion target 4 that is that be provided with the long rectangle that large area horizontal direction is major axis and that parallel with electron beam exit wound of bullet titanium window 2, it is connected by tubaeform auxiliary vacuum protective cover 5 between electron beam exit wound of bullet titanium window 2 and transmission-type x-ray conversion target 4；From the position of transmission-type x-ray conversion target 4, the sub-central beam axis of para-electric extend as central shaft, be provided with inner space section be horizontal direction be the extension radiation protection room 6 of the long rectangle of major axis；On the bottom surface in laterally Zigzag type sample transport mechanism is placed in radiation protection room 6 repeatedly being turned back that conveyer belt 9, multiple sample turn to that rotating disk 10, multiple transition pad 11 and sample export conveyer belt 8 form by sample inlet conveyer belt 7, multiple sample relaying, import conveyer belt 7 it is connected with outside with guard chamber outlet 13 by the guard chamber injection port 12 being opened on the sidewall of radiation protection room 6 respectively with exporting conveyer belt 8.
Vacuum pipe periphery before the electron beam exit wound of bullet titanium window 2 of electron accelerator 1 is provided with two-dimensional scan deflection coil magnet ring 3, making accelerated rear outgoing high-power electron beam make intermittent scanning in two dimensions of horizontal and vertical, the long cuboidal irradiance that horizontal direction is major axis and all forming Uniform Irradiation intensity on electron beam exit wound of bullet titanium window 2 on outer transmission Formula X line conversion target 4 target surface of arrival certain distance is wild.Tubaeform auxiliary vacuum protective cover 5 outer wall is made up of the lead and support cladding alloy aluminum meeting radiation protection adequate thickness, connect and clad the space between electron beam exit wound of bullet titanium window 2 and the outer transmission Formula X line conversion target 4 of certain distance, the suitable vacuum keeping this space avoids the scattering ionizing collision of electronics and air, with reduce outgoing electron amount of energy loss, and stop on transmission-type x-ray conversion target 4 produce reflection direction x-ray radiation leak out equipment.
Transmission-type x-ray conversion target 4 target surface is perpendicular with electron beam central axis, target surface is centrally located at certain distance position on the electron beam outer central shaft of exit wound of bullet titanium window 2, this distance is less than accelerated electron free range in air under vacuum in tubaeform auxiliary vacuum protective cover 5, long enough makes position electron beam scanning area-altitude approximate and irradiation sample outer package height again, and scan area width is irradiation sample outer package width 8 10 times, close to extending radiation protection room 6 internal cross-sectional area；Transmission-type x-ray conversion target 4 is shaped as the long rectangle that horizontal direction is major axis, area is slightly larger than position electron beam scanning area, the one side facing electron impact is made up of the high atomic number simple metal diaphragm of suitable thickness (slightly larger than incident electron range), the back side is supported by high-termal conductivity lower atomic number metals material suitable thickness (slightly larger than secondary electron range), and backing material can manufacture and design for being cooled down by circulating water flow or using the most air-cooled.The target surface high atomic number pure metal layer of transmission-type x-ray conversion target 4 can stop the high-power electron beam that scanning is incident completely, after its portion of energy is converted to high-energy X-ray radiation, can continue through each layer of transmission-type x-ray conversion target 4 with low-angle forward directed radiation, inject in extension radiation protection room 6, it is achieved indoor are illuminated the steady and continuous irradiation of sample.
Extend radiation protection room 6 inner space section be horizontal direction be the long rectangle of major axis, the width of interior section and height are respectively greater than width and the height of transmission-type x-ray conversion target 4, from the position of transmission-type x-ray conversion target 4, the sub-central beam axis of para-electric stretches and stretches out as central shaft, and the horizontal width of interior section is the most slightly widened and is highly held essentially constant.The length that stretches out extending radiation protection room 6 is selected according to the sample irradiation volume requirements of accelerator accelerating potential grade and design.Extend respectively facing the wall and meditating of radiation protection room 6 to be built up by adequate thickness concrete, if using electron beam central axis less than the semi-underground design below Earth surface plane, it is also possible to utilize natural rock or soil layer Substitute For Partial wall thickness.Offer guard chamber injection port 12 near transmission-type x-ray conversion target 4 position extending in 6 one, radiation protection room side walls, with its at a distance of multiple samples relaying turn back conveyer belt 9 width distance and position identical faces sidewall on, be further opened with guard chamber outlet 13.The width of guard chamber injection port 12 and guard chamber outlet 13 is slightly larger than the width of conveyer belt, and height slightly above transmits the height of sample.According to while irradiation difference irradiation dose sample demand, can also be in the case of the lengthening to the development length of radiation protection room shown in Fig. 1 during design-build, relevant position sidewall arranges second group into and out of sample mouth, corresponding configuration second overlaps the independent Zigzag type sample transport mechanism repeatedly controlling transfer rate, run with the most a set of sample transport mechanism of Zigzag type repeatedly simultaneously, for to irradiation while two grade irradiation dose difference samples of height, improving the service efficiency of system.
Horizontal Zigzag type sample transport mechanism the most repeatedly is relayed, by 7, six groups of samples of sample inlet conveyer belt, 9, seven samples of conveyer belt of turning back and turns to 10,14 transition pads 11 of rotating disk and sample export conveyer belt 8 to form, it is placed in extension radiation protection room 6, is distributed in indoor whole bottom surface.Sample inlet conveyer belt 7, sample relay turn back conveyer belt 9 and the outlet the most parallel close-packed arrays of conveyer belt 8, and each conveyer belt direction of transfer is vertical with electron beam center axis thereof line.Each conveyer belt width is identical, and slightly larger than transmitting sample outer package dimensions, conveyer belt transmission plane is identical with radiation protection room floor height, and each conveyer belt transmits linear velocity and remained identical by synchronous motor manipulation；It is contrary that adjacent conveyer belt transmits surface traffic direction.Sample turns to rotating disk 10 to be crisscross arranged at the two ends of adjacent conveyor belts respectively, connection adjacent conveyor belts, sample turns to rotating disk 10 radius slightly larger than conveyer belt width, turntable surface is all in substantially the same plane with conveyer belt transmission plane, and velocity of rotation is manipulated by synchronous motor and remain that on turntable surface, the linear velocity of radius 1/2 position is slightly faster than each conveyer belt transmission linear velocity.The length and width of transition pad 11 approximates conveyer belt width, is placed in each conveyer belt termination and rotating disk phase joining place and hides about half turntable surface, being fixed on slightly above turntable surface plan-position.
Laterally the method for operation of Zigzag type sample transport mechanism is the most repeatedly: is illuminated one, sample and suffers a ground and sent into extension radiation protection room 6 by import conveyer belt 7 by guard chamber injection port 12, through transition pad 11, sample turns to rotating disk 10 to make each part sample along own vertical axis line from turnback, it is sent to sample through another transition pad again and relays conveyer belt 9 of turning back, so process, after turning to several times and turning back, finally it is illuminated one, sample by outlet conveyer belt 8 by guard chamber outlet 13 to suffer a ground and send and extend radiation protection room 6, make each several part in each sample packaging by identical x-irradiation amount.Under stable accelerator radiation parameter, change repeatedly each conveyer belt transfer rate and each rotary speed in Zigzag type sample transport mechanism by synchronization modulation, the x-irradiation amount being subject to by irradiation sample can be regulated and controled.
Claims (6)
1. electron linear accelerator two-dimensional scan high-energy X-ray irradiation system, including electron accelerator (1) and appended two-dimensional scan deflection coil magnet ring (3), transmission-type x-ray conversion target (4), extend radiation protection room (6), Zigzag type sample transport mechanism the most repeatedly, it is characterized in that: electron accelerator (1) is in Horizontal type, vacuum pipe periphery before its electron beam exit wound of bullet titanium window (2) is provided with two-dimensional scan deflection coil magnet ring (3), transmission-type x-ray conversion target (4) that is that be provided with the long rectangle that large area horizontal direction is major axis at a certain distance from after on the central shaft of electron beam exit wound of bullet titanium window (2) and that parallel with electron beam exit wound of bullet titanium window (2), it is connected by tubaeform auxiliary vacuum protective cover (5) between electron beam exit wound of bullet titanium window (2) and transmission-type x-ray conversion target (4)；From the position of transmission-type x-ray conversion target (4), the sub-central beam axis of para-electric extend as central shaft, be provided with interior section be horizontal direction be the extension radiation protection room (6) of the long rectangle of major axis；It is placed on the bottom surface extended in radiation protection room (6) by sample inlet conveyer belt (7), the multiple sample relaying Zigzag type sample transport mechanism the most repeatedly that conveyer belt (9), multiple sample turn to rotating disk (10), multiple transition pad (11) and sample export conveyer belt (8) to form of turning back, import conveyer belt (7) is connected with outside with guard chamber outlet (13) by the guard chamber injection port (12) being opened on extension radiation protection room (6) sidewall respectively with outlet conveyer belt (8).
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system the most according to claim 1, it is characterized in that: tubaeform auxiliary vacuum protective cover (5) outer wall is made up of the lead and support cladding aluminium alloy meeting radiation protection requirement adequate thickness, connects and is coated with the space between electron beam exit wound of bullet titanium window (2) and transmission-type x-ray conversion target (4).
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system the most according to claim 1, it is characterized in that: transmission-type x-ray conversion target (4) target surface is perpendicular with electron beam central axis, target surface is centrally located on the central shaft of electron beam exit wound of bullet titanium window (2), distance between transmission-type x-ray conversion target (4) and electron beam exit wound of bullet titanium window (2) makes electron beam scanning plane height on target be equal to be illuminated sample outer package highly, and 8-10 times that scanning plane width is sample outer package width；Transmission-type x-ray conversion target (4) is shaped as the long rectangle that horizontal direction is major axis, area is slightly larger than position electron beam scanning area, the one side facing electron impact is made up slightly larger than the high atomic number simple metal diaphragm of incident electron range of thickness, the back side is slightly larger than the metallic material of secondary electron range by high-termal conductivity low atomic number and thickness, and backing material is cooled down by circulating water flow or uses the most air-cooled.
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system the most according to claim 1, it is characterized in that: extend radiation protection room (6) interior section be horizontal direction be the long rectangle of major axis, the width of interior section and height are respectively greater than width and the height of transmission-type x-ray conversion target (4), from the position of transmission-type x-ray conversion target (4), the sub-central beam axis of para-electric stretches and stretches outside central axial, and the horizontal width of interior section is the most slightly widened and is highly held essentially constant；Extend respectively facing the wall and meditating of radiation protection room (6) to be built up by concrete；Offer guard chamber injection port (12) near transmission-type x-ray conversion target (4) position extending in (6) one, radiation protection room side walls, with its at a distance of multiple samples relaying turn back conveyer belt (9) width position identical faces sidewall on be further opened with guard chamber outlet (13)；The width of guard chamber injection port (12) and guard chamber outlet (13) is slightly larger than the width of conveyer belt, and height slightly above transmits the height of sample.
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system the most according to claim 4, it is characterized in that: when extending the semi-underground design that radiation protection room (6) employing electron beam central axis is less than below Earth surface plane, utilize natural rock or soil layer Substitute For Partial wall thickness.
Electron linear accelerator two-dimensional scan high-energy X-ray irradiation system the most according to claim 1, it is characterized in that: laterally Zigzag type sample transport mechanism is turned to rotating disk (10), multiple transition pad (11) and outlet conveyer belt (8) to form by turn back conveyer belt (9), multiple sample of import conveyer belt (7), multiple sample relaying the most repeatedly, it is placed in extension radiation protection room (6), is distributed in whole bottom surface；Import conveyer belt (7), sample relay turn back conveyer belt (9) and outlet conveyer belt (8) the most parallel close-packed arrays, and each conveyer belt direction of transfer is all vertical with electron beam central axis extension line；Each conveyer belt width is identical, and slightly larger than transmitting sample outer package dimensions, conveyer belt transmission plane is identical with extending radiation protection room floor height, and each conveyer belt transmits linear velocity and remained identical by synchronous motor manipulation；It is contrary that adjacent conveyer belt transmits surface traffic direction；Each sample turns to rotating disk (10) to be crisscross arranged at the two ends of adjacent conveyor belts respectively, connection adjacent conveyor belts, sample turns to rotating disk (10) radius slightly larger than conveyer belt width, turntable surface is all in substantially the same plane with conveyer belt transmission plane, and velocity of rotation is manipulated by synchronous motor and remain that on turntable surface, the linear velocity of radius 1/2 position is slightly faster than each conveyer belt transmission linear velocity；The length and width of transition pad (11) is equal to conveyer belt width, is placed in each conveyer belt termination and turns to rotating disk phase joining place and hide half turntable surface, being fixed on slightly above turntable surface plan-position.
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| CN108811295B (en) * | 2018-07-04 | 2019-10-15 | 中国原子能科学研究院 | Target drone structure is rotatably changed used in a kind of cyclotron |
| KR102645976B1 (en) * | 2019-06-14 | 2024-03-08 | 프라마톰 게엠베하 | System for sterilizing a sterilization unit and method for operating such a system |
| CN111403073B (en) * | 2020-03-19 | 2023-01-03 | 哈尔滨工程大学 | Multipurpose terminal based on electron accelerator |
| CN111681802A (en) * | 2020-07-15 | 2020-09-18 | 东莞市百晟新材料科技有限公司 | Electron accelerator irradiation system |
| CN112843359A (en) * | 2021-01-15 | 2021-05-28 | 成都奕康真空电子技术有限责任公司 | Blood irradiator based on electron accelerator X-rays and irradiation method |
| CN115472329B (en) * | 2022-09-30 | 2023-05-05 | 深圳技术大学 | Irradiation device and transparent target preparation method |
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