CN101110280B - Irradiation device and its control method - Google Patents

Abstract

The invention provides an irradiation device and its control method. The device comprises an electron accelerator and a scanning box connected with the electron accelerator. A scanning magnet, a target and an electron beam exit window are arranged on the scanning box. The electron beam exit window is located at left or right of the target. The positive effects of the present invention are: the present invention integrates the functions of the existing electron beam extraction type irradiation device and the X-ray extraction type irradiation device, when the scanning magnet is working, the accelerator irradiation device draws the electron beam current; when the scanning magnet When not working, X-rays are drawn out. That is to say, two radiation sources, electron beam and X-ray, can be extracted to meet the processing requirements of irradiated objects with different volumes. Utilizing the invention can expand the application range without increasing the cost, and at the same time improve the safety performance of the system, which is beneficial to improving the service life and utilization rate of the irradiation system.

Description

Irradiation device and its control method

technical field

The invention relates to an irradiation device in the technical field of radiation processing and a control method thereof.

Background technique

Irradiation processing is the use of high-energy electron beams, X-rays generated by electron beam targeting or gamma rays emitted by radionuclides for polymer material preparation, food storage and preservation, radiation disinfection of medical supplies, radiation sterilization of medicines, commodity radiation maintenance, crystal and pearls and other radiation coloring and radiation treatment of environmental pollutants. Irradiation processing industry is considered to be a new processing system with high economic benefits, energy saving, manpower saving, and pollution-free. It has been widely used in various fields such as agriculture, industry, medical care and health. play an increasingly prominent role.

Generally, accelerators are used to generate electron beams with a certain energy. These accelerators include traveling wave or standing wave electron linear accelerators, DC high-voltage accelerators, and the latter include: electrostatic accelerators, insulating core transformer accelerators, electronic curtain accelerators, high-frequency high-voltage accelerators, etc. The electron beam extraction type irradiation device as shown in Figure 1 comprises electron linear accelerator 1, the scanning magnet 3 that is installed on the electron linear accelerator 1 by flange 2 and the scanning box 4 of triangular shape, is installed on the scanning box 4 The electron beam exit window 10 at the electron beam exit position of the electron linear accelerator, and the cooling water circuit 9 installed on the bottom of the scanning box 4 for cooling the electron beam exit window 10, wherein the cooling water circuit 9 passes through the cooling water inlet 8 and the cooling water outlet 12 External cooling water system; when working, the scanning mode of the scanning magnet 3 is bidirectional scanning, that is, the positive and negative scanning currents each occupy half a cycle. The irradiation device of this structure usually directly leads the electron beam 5 through the scanning box 4 and other devices to carry out irradiation processing, and the irradiation processing using the electron beam has the advantages of high power, high efficiency, good safety performance, etc., but due to the electron beam The penetration depth is small and can only be used for small or thin objects. For objects that are large and indivisible, such as log insecticide, the effect is not good. At the same time, the scanning box of the traditional electron beam exit window type irradiation device has high requirements on the stability of the scanning magnet. If the scanning magnet 3 breaks down during work, even for a short time, the electron beam 5 will give the electron beam exit window 10 cause serious damage, even damage the entire system including electron linear accelerator 1 and scanning box 4.

When performing radiation treatment on large and indivisible objects, X-ray extraction type irradiation devices are usually used. The structure of the X-ray extraction type irradiation device shown in Figure 2 includes an electron linear accelerator 1, a flange 2 The drift section 13 installed on the electron linear accelerator 1, the target 7 installed at the central position of the outgoing beam, and the cooling water circuit 9 installed at the bottom of the drift section 13 for cooling the target 7, wherein the cooling water circuit 9 passes through the cooling water inlet 8 , The cooling water outlet 12 is externally connected to the cooling water system. The electron beam produced by the electron linear accelerator 1 is used to strike a target to generate X-rays for irradiation processing. X-ray has the advantage of large penetration depth, and can irradiate large-volume objects. However, because it is converted from electron beam targeting, its efficiency is lower than that of electron beam irradiation.

In existing accelerator irradiation devices, either electron beams are drawn out for irradiation, or electron beams are targeted to generate X-rays for irradiation, and their irradiation objects have certain limitations.

Contents of the invention

(1) Technical problems to be solved

The object of the present invention is to provide an irradiation device capable of extracting electron beams and X-ray radiation sources at the same time, aiming at the shortcomings of the above-mentioned prior art.

(2) Technical solution

To achieve the above object, the present invention provides an irradiation device, which includes an electron accelerator, a scanning box connected to the electron accelerator, and a scanning magnet for controlling the electron beam generated by the electron accelerator, which is characterized in That is, the scanning box is provided with a target and an electron beam exit window, so that when the scanning magnet is not working, the electron beam hits the target to generate X-rays for output, and when the scanning magnet is working, the electron beam passes through The scanned electron beam is output through the electron beam exit window.

Preferably, the target is arranged directly in front of the electron beam generated by the electron accelerator.

Preferably, the electron beam exit window is located on the left or right side of the target.

Preferably, the target is arranged inside the electron beam exit window to form an inner target structure.

Preferably, the scanning box is also provided with a cooling water circuit for cooling the target and the electron beam exit window.

Preferably, when the scanning magnet is working, the scanning center of the scanned electron beam is deflected relative to the direction of the electron beam generated by the electron accelerator by controlling the scanning current supplied to the scanning magnet.

The present invention also provides a control method for an irradiation device, the irradiation device includes an electron accelerator, a scanning box connected to the electron accelerator, and a scanning magnet for controlling the electron beam generated by the electron accelerator , and the scanning box is provided with a target and an electron beam exit window, the control method includes the following steps: a). When the scanning magnet is not working, the electron beam produced by the electron accelerator is shot onto the target Generate X-rays, so that the irradiation device outputs X-rays; b). When the scanning magnet is working, by supplying deflection scanning current to the scanning magnet, the scanned electron beam is deflected and then exits through the electron beam window, so that the irradiation device outputs a scanning electron beam.

(3) Beneficial effects

The advantages and positive effects of the irradiation device that can be extracted from two sources in the present invention are: the structure of the present invention includes an electron linear accelerator, a scanning box, a target and an electron beam exit window, and integrates the existing electron beam extraction type irradiation device It is integrated with the function of the X-ray extraction type irradiation device. When the scanning magnet is working, the irradiation device leads out the electron beam; when the scanning magnet is not working, it leads out the X-rays. That is to say, the device of the present invention can extract two kinds of radiation sources, electron beam and X-ray, so as to meet the processing requirements of irradiated objects with different volumes. Utilizing the radiation device that can be extracted from dual sources according to the present invention can expand the scope of application with little increase in cost. The X-rays generated by the electron beam hitting the target along the forward direction will not damage the electron beam exit window, and the system has high safety performance, which is beneficial to improve the service life and utilization rate of the irradiation device capable of dual-source extraction of the present invention.

Description of drawings

Fig. 1 is the structural representation of existing electron beam extraction type irradiation device;

Fig. 2 is the structural schematic diagram of existing X-ray extraction type irradiation device;

Fig. 3 is a schematic structural view of the first embodiment of the radiation device that can be extracted from two sources according to the present invention;

Fig. 4 is a schematic structural diagram of the second embodiment of the irradiation device capable of dual-source extraction according to the present invention.

Detailed ways

The specific implementation of the irradiation device capable of dual-source extraction according to the present invention will be further described in detail below in conjunction with the accompanying drawings, but it is not used to limit the protection scope of the present invention.

Example 1

The radiation device that can be drawn from two sources according to the present invention includes an electron linear accelerator 1, a scanning box 4 installed on the electron linear accelerator 1 through a flange 2, and is installed at a position where the scanning box 4 is connected to the electron linear accelerator 1 There is a scanning magnet 3, and a target 7 is provided on the scanning box 4 facing the beam output position of the electron linear accelerator 1. The target 7 is made of heavy metal materials such as tungsten or tungsten alloy, and the left or right side of the target 7 on the scanning box 4 An electron beam exit window 10 made of metal foil such as titanium is provided. The scanning box shown in the figure is triangular in shape, but the shape of the scanning box is not limited and can be any suitable shape. In the radiation device capable of dual-source extraction of the present invention, the scanning mode of the scanning magnet 3 is one-way scanning, that is, the scanning current is all positive or all negative, and the scanning current can be superimposed by a positive or negative scanning current from the original bidirectional scanning current. to obtain the current. The unidirectional scanning mode can be completed by the prior art. The target 7 is located directly in front of the electron beam 5 , and the electron beam exit window 10 is located directly in front of the electron beam 6 . The scanning box 4 in the present invention is a dual-source extraction scanning box, and has two extraction windows at the same time. When the scanning magnet 3 is not working, the direction of the electron beam 5 is along the direction of the electron beam coming out of the original accelerator, and the electron beam 5 hits the target 7 to generate X-rays lead out X-rays; when the scanning magnet 3 works, the electron beam deviates from the direction of the original electron beam 5 and scans on one side thereof, forming an electron beam 6 which is scanned into a linear beam and passes through the electron beam exit window 10 Extract the electron beam. A cooling water circuit 9 for cooling the target 7 and the electron beam exit window 10 is installed at the bottom of the scanning box 4 , wherein the cooling water circuit 9 is externally connected to the cooling water system through the cooling water inlet 8 and the cooling water outlet 12 .

Example 2

In this embodiment, the target 7 is an internal target structure arranged inside the electron beam exit window 10. When the scanning magnet 3 is not working, the electron beam current 5 produced by the electron linear accelerator 1 hits the target 7 to generate X-rays, and the X-rays are emitted through the electron beams. Because the electron beam exit window is very thin, which is tens of microns, the energy deposition of X-rays on the electron beam exit window is very small and can be ignored. X-rays will not damage the electron beam exit window, nor will the electron beam exit window. It will affect X-rays; when the scanning magnet 3 is working, the electron beam generated by the electron linear accelerator 1 deviates from the direction of the original electron beam current and scans on one side thereof, and the electron beam current 6 that forms the deviation is scanned into a linear beam current, The electron beam is extracted through the electron beam exit window 10 .

The above are the best implementation modes of the present invention. Based on the disclosed content of the present invention, some similarities and alternatives that can be clearly imagined by those skilled in the art should fall within the protection scope of the present invention.

Claims (7)

1. irradiation devices; Comprise electron accelerator (1), the scan box (4) that is connected with said electron accelerator (1) and be used for the sweeping magnet (3) of control by the electron beam of said electron accelerator (1) generation; It is characterized in that; Said scan box (4) comprises target (7) and electron beam exit window (10), thereby at said sweeping magnet (3) when not working, electron beam is mapped to said target (7) and goes up and produce X ray and export; And when said sweeping magnet (3) is worked, export through said electron beam exit window (10) through the electron beam of said sweeping magnet (3) simple scanning.

2. irradiation devices according to claim 1 is characterized in that, said target (7) is arranged on the dead ahead of the electron beam (5) that electron accelerator (1) produced.

3. irradiation devices according to claim 2 is characterized in that, said electron beam exit window (10) is positioned at the left side or the right side of target (7).

4. irradiation devices according to claim 2 is characterized in that, said target (7) is arranged on electron beam exit window (10) inboard, target structure in forming.

5. according to each described irradiation devices among the claim 1-4, it is characterized in that said scan box (4) also is provided with the cooling water channel (9) that is used for cooled target (7) and electron beam exit window (10).

6. according to each described irradiation devices among the claim 1-4; It is characterized in that; When said sweeping magnet (3) is worked; Be supplied to the sweep current of said sweeping magnet (3) through control, make the direction deflection of the electron beam (5) that is produced with respect to said electron accelerator (1) through the center of the electron beam of scanning.

7. the control method of irradiation devices; Said irradiation devices comprise electron accelerator (1), the scan box (4) that is connected with said electron accelerator (1) and are used for the sweeping magnet (3) of control by the electron beam of said electron accelerator (1) generation; And said scan box (4) comprises target (7) and electron beam exit window (10), and said control method may further comprise the steps:

A). when not working, the electron beam that said electron accelerator (1) is produced is mapped to said target (7) and goes up the generation X ray at said sweeping magnet (3), thus said irradiation devices output X ray;

B). when said sweeping magnet (3) is worked; Through supplying the deflection scanning electric current to said sweeping magnet (3); Make and behind the electron beam deflecting of said sweeping magnet (3) simple scanning, pass through said electron beam exit window (10), thus said irradiation devices output scanning electron beam.

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