CN113421809B - X-ray tube for irradiation and method for modulating circumferential and axial uniform distribution of dose thereof - Google Patents
X-ray tube for irradiation and method for modulating circumferential and axial uniform distribution of dose thereof Download PDFInfo
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- CN113421809B CN113421809B CN202110729700.4A CN202110729700A CN113421809B CN 113421809 B CN113421809 B CN 113421809B CN 202110729700 A CN202110729700 A CN 202110729700A CN 113421809 B CN113421809 B CN 113421809B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/112—Non-rotating anodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/045—Electrodes for controlling the current of the cathode ray, e.g. control grids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
- H01J35/153—Spot position control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
- H01J35/30—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof by deflection of the cathode ray
Abstract
The invention discloses an X-ray tube for irradiation and a method for modulating the circumferential and axial uniform distribution of dose thereof, which relate to the technical field of X-ray tubes and have the technical scheme key points that: comprises an anode cylinder; the X-ray conversion target is in a cylindrical structure, and the outer wall of the X-ray conversion target is attached to the inner wall of the anode cylinder; the cathode head is of a spherical structure which is coaxial with the anode cylinder, and the cathode head is fixedly arranged in the anode cylinder through a high-voltage insulator; the cathode filament, the deflection grid and the anode cylinder are coaxially arranged. The invention can generate an annular bombardment band on the anode target with a cylindrical structure, and a plurality of annular bombardment bands at intervals are generated by combining the rapid switching of the electromagnetic field to generate a superposed X-ray radiation field, thereby regulating and controlling the axial dose uniformity and improving the circumferential and axial dose uniformity.
Description
Technical Field
The invention relates to the technical field of X-ray tubes, in particular to an X-ray tube for irradiation and a method for modulating circumferential and axial uniform distribution of dose of the X-ray tube.
Background
The X-ray tube is an electric vacuum device for generating X-rays based on electron beam targeting, the X-ray tube with evenly distributed dose is a novel irradiation source, and has wide application and economic value in the irradiation processing fields of food processing, medical instruments, blood irradiation, material modification, biological breeding and the like.
At present, the basic structure of an X-ray tube mainly includes an insulating member, a cathode for generating an electron beam, and an anode as an X-ray conversion target, the cathode and the anode being oppositely disposed, and the electron beam being directly applied to the anode target under the action of an electric field between the cathode and the anode to generate X-rays. However, such X-ray tubes generally have a good dose uniformity over a small cone angle and are not suitable for high power irradiation processing due to the local high temperature caused by the small focal spot of the electron beam on the target surface. With the development of the field of irradiation processing in recent years, some X-ray tubes for irradiation are developed, such as a cone-shaped anode target circumferential structure X-ray tube, which achieves uniform distribution of circumferential dose, but axial dose uniformity is limited by an anode target angle, so that the overall irradiation field of view is limited. Other irradiation tubes adopt a mode of axially arranging cathodes, and electron beams directly irradiate and bombard the cylindrical target along the radial direction.
Therefore, how to study and design an irradiation X-ray tube with simple structure and high reliability and a modulation method for circumferential and axial uniform distribution of dose of the irradiation X-ray tube are problems which are urgently needed to be solved at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an X-ray tube for irradiation and a method for modulating the circumferential and axial uniform distribution of dose of the X-ray tube.
The technical purpose of the invention is realized by the following technical scheme:
in a first aspect, an X-ray tube for irradiation is provided, which comprises a cathode head, an X-ray conversion target, and an anode cylinder;
the X-ray conversion target is in a cylindrical structure which is coaxial with the anode cylinder, and the outer wall of the X-ray conversion target is attached to the inner wall of the anode cylinder;
the cathode head is of a spherical structure which is coaxial with the anode cylinder, is fixedly arranged in the anode cylinder through a high-voltage insulator and is positioned on one end face side of the X-ray conversion target;
the cathode head is provided with a deflection grid and a cathode filament in an annular structure in a groove on the end face facing the X-ray conversion target, the deflection grid and the cathode head are isolated by a cathode insulator, and the deflection grid and the anode cylinder are coaxially arranged.
Furthermore, the high-voltage insulator is in a conical barrel shape, one end of the high-voltage insulator is connected with the inner wall of the anode barrel in a sealing mode, and a lead of the cathode filament is connected with a core wire of the high-voltage insulator.
Furthermore, the deflection grid is cylindrical, and the working voltage of the deflection grid is provided with at least two switching gears.
In a second aspect, an X-ray tube for irradiation is provided, which comprises a cathode head, an X-ray conversion target, and an anode cylinder;
the X-ray conversion target is in a cylindrical structure which is coaxial with the anode cylinder, and the outer wall of the X-ray conversion target is attached to the inner wall of the anode cylinder;
the cathode head is of a sphere-like structure which is coaxial with the anode cylinder, and is fixedly arranged in the anode cylinder through a high-voltage insulator and positioned on one end face side of the X-ray conversion target;
the spiral cathode filament is arranged in the groove of the end face of the cathode head facing the X-ray conversion target, the deflection coil positioned on the other end face side of the X-ray conversion target is arranged at one end of the anode cylinder, and the cathode filament and the anode cylinder are coaxially arranged.
Furthermore, one end of the X-ray conversion target facing the cathode head is provided with an opening, and the other end of the X-ray conversion target is provided with a plug.
Furthermore, the working current of the deflection coil is provided with at least two switching gears.
In a third aspect, there is provided a method for modulating a circumferentially and axially uniform dose distribution of an X-ray tube for irradiation according to any one of the first aspect, comprising the steps of:
after the electron beam is emitted from the cathode filament along the axial direction of the anode cylinder, the electron beam is gradually transited from the axial emission to the circumferential emission under the action of a deflection accelerating electric field formed by the cathode head, the deflection grid and the anode cylinder and bombards the X-ray conversion target to form an annular bombardment band, and an X-ray beam uniformly emitted in the circumferential direction is generated after time averaging;
the electric potential of the deflecting grid is adjusted to change the size of a deflecting electric field, a plurality of X-ray beams which are distributed in a segmented and interval manner in the axial direction and are in annular bombardment zones are formed, and the annular X-ray beams emitted in multiple segments are overlapped in time to regulate and control the uniform distribution of the irradiation dose in the axial direction and the circumferential direction.
Further, the regulation and control process of the irradiation dose in the axial direction and the circumferential direction specifically comprises the following steps:
D＝D1(U1)+D2(U2)
wherein D is the average total dose distribution when the electron beams alternately bombard on the position A and the position B; d1(U1) To be at a deflection gate voltage of U1Electricity when doingDose distribution outside the tube at the axial position A is bombarded by the sub-rings; d2(U2) To be at a deflection gate voltage of U2The electron ring bombards the dose distribution outside the tube at axial position B.
In a fourth aspect, there is provided a dose circumferential and axial uniform distribution modulation method for an X-ray tube for irradiation according to any one of the second aspects, comprising the steps of:
after the electron beam is emitted from the cathode filament along the axial direction of the anode cylinder, the electron beam is accelerated and deflected to bombard the X-ray conversion target under the action of an accelerating electric field between the cathode head and the anode cylinder and the action of a deflecting magnetic field of a deflecting coil, an annular bombarding band is formed along with the change of the direction of the magnetic field, and the X-ray beam which is uniformly emitted in the circumferential direction is generated after time averaging;
the size of the deflection magnetic field is changed by adjusting the current of the deflection coil, a plurality of X-ray beams which are annular bombardment zones and distributed in a segmented and interval mode in the axial direction are formed, and the irradiation dose is regulated and controlled to be uniformly distributed in the axial direction and the circumferential direction after the annular X-ray beams emitted in multiple segments are overlapped in time.
Further, the regulation and control process of the irradiation dose in the axial direction and the circumferential direction specifically comprises the following steps:
D＝D1(I1)+D2(I2)
wherein D is the average total dose distribution when the electron beams alternately bombard on the position A and the position B; d1(I1) When the current of the deflection coil is I1Then, the electron ring bombards the dose distribution outside the tube at the axial position A; d2(I2) When the current of the deflection coil is I2The electron ring bombards the dose distribution outside the tube at axial position B.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the electron beam emitted axially is modulated and deflected by electromagnetic force regulation, an annular bombardment zone can be generated on the anode target with a cylindrical structure, a circumferentially emitted X-ray beam is generated, a plurality of segmented and spaced annular bombardment zones are generated by combining rapid switching of an electromagnetic field, a superposed X-ray radiation field is generated, the axial dose uniformity can be regulated and controlled, and the circumferential and axial dose uniformity is improved;
2. the uniformity and the view field size of the axial radiation field are modulated by the voltage of a deflection grid or the current of a deflection coil, the structure of an anode target and other parameters; meanwhile, the bombardment zone of the electron beam on the anode target can be regulated and controlled, and compared with a small focal spot bombardment point of a traditional X-ray tube, the heat distribution on the anode target is wider and more uniform, and the heat dissipation and the electron beam power promotion are facilitated, so that the radiation power is improved.
3. The invention uses a ball-like traditional cathode head structure, realizes circumferential emission and axial gear shifting by combining an electromagnetic field deflection technology, has simpler structure and better reliability when working under high pressure compared with the cathode design of axial arrangement and coaxial anode cylinder.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view in example 1 of the present invention;
FIG. 2 is a schematic structural view in example 2 of the present invention;
FIG. 3 is a schematic diagram of an electron beam bombardment process in an embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
1. an electron beam; 2. a cathode filament; 3. a cathode head; 4. a deflection yoke; 5. an anode cylinder; 6. an X-ray conversion target; 7. a high-voltage insulator; 8. a cathode insulator; 9. the grid is deflected.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1: as shown in fig. 1, the X-ray tube for irradiation modulated by electric field force includes a cathode head 3, an X-ray conversion target 6, and an anode cylinder 5. The X-ray conversion target 6 is in a cylindrical structure which is coaxial with the anode cylinder 5, and the outer wall of the X-ray conversion target 6 is attached to the inner wall of the anode cylinder 5. The cathode head 3 is a spherical structure which is coaxial with the anode cylinder 5, and the cathode head 3 is fixedly installed in the anode cylinder 5 through a high-voltage insulator 7 and is positioned on one end face side of the X-ray conversion target 6. The cathode head 3 is provided with a deflection grid 9 and a cathode filament 2 in an annular structure in a groove on the end face facing the X-ray conversion target 6, the deflection grid 9 and the cathode head 3 are isolated by a cathode insulator 8, and the cathode filament 2 and the deflection grid 9 are coaxially arranged with the anode cylinder 5.
The high-voltage insulator 7 is in a conical barrel shape, one end of the high-voltage insulator 7 is connected with the inner wall of the anode barrel 5 in a sealing mode, and the connecting end of the cathode filament 2 stretches into the high-voltage insulator 7 in a protruding mode. The problem of the connection stability of the traditional cathode filament 2 can be effectively solved.
The deflection grid 9 is cylindrical, and the operating voltage of the deflection grid 9 is provided with at least two switching steps.
The method for modulating the circumferential and axial uniform distribution of the dose of the X-ray tube for irradiation comprises the following steps:
s1: after being emitted axially along the anode cylinder 5 from the cathode filament 2, the electron beam 1 is emitted circumferentially under the action of a deflection accelerating electric field formed by the cathode head 3, the deflection grid 9 and the anode cylinder 5 and bombards the X-ray conversion target 6 to form an annular bombardment band and generate an X-ray beam uniformly emitted circumferentially;
s2: the electric potential of the deflecting grid 9 is adjusted to change the size of a deflecting electric field, a plurality of X-ray beams which are distributed in a segmented and interval manner in the axial direction and are in annular bombardment zones are formed, and the annular X-ray beams emitted in multiple segments are overlapped in time to regulate and control the uniform distribution of the irradiation dose in the axial direction and the circumferential direction.
The regulation and control process of the irradiation dose in the axial direction and the circumferential direction is specifically as follows:
D＝D1(U1)+D2(U2)
wherein D is the average total dose distribution when the electron beams alternately bombard on the position A and the position B; d1(U1) To make the voltage at the deflecting grid 9 be U1Then, the electron ring bombards the dose distribution outside the tube at the axial position A; d2(U2) To make the voltage at the deflecting grid 9 be U2The electron ring bombards the dose distribution outside the tube at axial position B.
Example 2: an X-ray tube for irradiation, as shown in fig. 2, embodiment 2 is different from embodiment 1 in that: the spiral cathode filament 2 is arranged in the groove of the end face of the cathode head 3 facing the X-ray conversion target 6, the deflection coil 4 positioned on the other end face side of the X-ray conversion target 6 is arranged at one end of the anode cylinder 5, and the deflection coil 4 and the cathode filament 2 are both arranged coaxially with the anode cylinder 5. The spiral cathode filament 2 is manufactured by winding or etching.
The X-ray conversion target 6 is arranged toward one end opening of the cathode head 3, and the other end is arranged in a sealing way.
The operating current of the deflection coil 4 is provided with at least two switching steps.
The method for modulating the circumferential and axial uniform distribution of the dose of the X-ray tube for irradiation comprises the following steps:
s3: after the electron beam 1 is emitted from the cathode filament 2 along the axial direction of the anode cylinder 5, the electron beam is accelerated and deflected to bombard the X-ray conversion target 6 under the action of an accelerating electric field between the cathode head 3 and the anode cylinder 5 and the action of a deflecting magnetic field of the deflecting coil 4, an annular bombarding zone is formed along with the change of the direction of the magnetic field, and X-ray beams which are uniformly emitted in the circumferential direction are generated after time averaging;
s4: the current of the deflection coil 4 is adjusted to change the size of the deflection magnetic field, a plurality of X-ray beams which are distributed in a segmented and interval manner in the axial direction and are in annular bombardment zones are formed, and the annular X-ray beams emitted in multiple segments are overlapped in time to regulate and control the uniform distribution of the irradiation dose in the axial direction and the circumferential direction.
The regulation and control process of the irradiation dose in the axial direction and the circumferential direction is specifically as follows:
D＝D1(I1)+D2(I2)
wherein D is the average total dose distribution when the electron beams alternately bombard at the position A and the position B, as shown in C in FIG. 3; d1(I1) When the current of the deflection coil is I1While the electron ring bombards the dose distribution outside the tube at axial position a, as shown at D in fig. 3; d2(I2) When the current of the deflection coil is I2The electron ring bombards the dose distribution outside the tube at axial position B, e.g. in fig. 3.
The working principle is as follows: according to the invention, the electron beam 1 flow emitted axially is modulated and deflected by electromagnetic force regulation, an annular bombardment band can be generated on the anode target with a cylindrical structure to generate an X-ray beam emitted circumferentially, a plurality of annular bombardment bands at intervals are generated by combining rapid switching of an electromagnetic field to generate a superposed X-ray radiation field, the axial dose uniformity can be regulated and controlled, and the circumferential and axial dose uniformity is improved; in addition, the uniformity of the axial radiation field and the size of the field of view are modulated by the voltage of the deflection grid 9 or the current of the deflection coil 4, the anode target structure and other parameters; meanwhile, the bombardment zone of the electron beam 1 on the anode target can be regulated and controlled, and compared with a small focal spot bombardment point of a traditional X-ray tube, the heat distribution on the anode target is wider and more uniform, heat dissipation and the improvement of the power of the electron beam 1 are facilitated, and further the radiation power is improved. Compared with the cathode design with axial arrangement and coaxial anode cylinder, the structure is simpler, and the high-voltage high-power-voltage high-power-voltage high-voltage medium-voltage high-voltage medium-voltage high-voltage medium-voltage power source.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The X-ray tube for irradiation comprises a cathode head (3) and an X-ray conversion target (6), and is characterized by further comprising an anode cylinder (5);
the X-ray conversion target (6) is of a cylindrical structure which is coaxial with the anode cylinder (5), and the outer wall of the X-ray conversion target (6) is attached to the inner wall of the anode cylinder (5);
the cathode head (3) is of a spherical structure which is coaxial with the anode cylinder (5), and the cathode head (3) is fixedly arranged in the anode cylinder (5) through a high-voltage insulator (7) and is positioned on one end face side of the X-ray conversion target (6);
a deflection grid (9) and a cathode filament (2) in an annular structure are arranged in a groove on the end face, facing the X-ray conversion target (6), of the cathode head (3), the deflection grid (9) and the cathode head (3) are isolated by a cathode insulator (8), and the deflection grid (9) and the anode cylinder (5) are coaxially arranged;
after the electron beam (1) is emitted from the cathode filament (2) along the axial direction of the anode cylinder (5), the electron beam is emitted in the circumferential direction under the action of a deflection accelerating electric field formed by the cathode head (3), the deflection grid (9) and the anode cylinder (5) and bombards the X-ray conversion target (6) to form an annular bombardment belt.
2. The X-ray tube for irradiation as set forth in claim 1, wherein the high voltage insulator (7) is in the shape of a cone, one end of the high voltage insulator (7) is hermetically connected to the inner wall of the anode cylinder (5), and the lead of the cathode filament (2) is connected to the core wire of the high voltage insulator (7).
3. The X-ray tube for irradiation according to claim 1, wherein the deflection grid (9) is cylindrical and the operating voltage of the deflection grid (9) is provided with at least two switching steps.
4. The X-ray tube for irradiation comprises a cathode head (3) and an X-ray conversion target (6), and is characterized by further comprising an anode cylinder (5);
the X-ray conversion target (6) is of a cylindrical structure which is coaxial with the anode cylinder (5), and the outer wall of the X-ray conversion target (6) is attached to the inner wall of the anode cylinder (5);
the cathode head (3) is of a spherical structure which is coaxial with the anode cylinder (5), and the cathode head (3) is fixedly arranged in the anode cylinder (5) through a high-voltage insulator (7) and is positioned on one end face side of the X-ray conversion target (6);
a spiral cathode filament (2) is arranged in a groove on the end face of the cathode head (3) facing the X-ray conversion target (6), one end of the anode cylinder (5) is provided with a deflection coil (4) positioned on the other end face side of the X-ray conversion target (6), and the deflection coil (4) and the cathode filament (2) are coaxially arranged with the anode cylinder (5);
after the electron beam (1) is emitted from the cathode filament (2) along the axial direction of the anode cylinder (5), the electron beam is accelerated and deflected to bombard the X-ray conversion target (6) under the action of an accelerating electric field between the cathode head (3) and the anode cylinder (5) and the action of a deflecting magnetic field of the deflecting coil (4), and an annular bombarding band is formed along with the change of the direction of the magnetic field.
5. The X-ray tube for irradiation according to claim 4, wherein the X-ray conversion target (6) is disposed open toward one end of the cathode head (3) and closed off at the other end.
6. The X-ray tube for irradiation according to claim 4, wherein the deflection coil (4) is provided with at least two switching steps for its operating current.
7. A method of modulating a dose distribution of an X-ray tube for irradiation according to any one of claims 1 to 3, comprising the steps of:
after the electron beam (1) is emitted from the cathode filament (2) along the axial direction of the anode cylinder (5), the electron beam is gradually transited from axial emission to circumferential emission and bombards to an X-ray conversion target (6) under the action of a deflection accelerating electric field formed by the cathode head (3), the deflection grid (9) and the anode cylinder (5) together, an annular bombardment zone is formed, and X-ray beams uniformly emitted in the circumferential direction are generated after time averaging;
the size of a deflection electric field is changed by adjusting the electric potential of the deflection grid (9), a plurality of X-ray beams which are annular bombardment bands and distributed in a segmented and interval mode in the axial direction are formed, and the irradiation dose is regulated and controlled to be uniformly distributed in the axial direction and the circumferential direction after the annular X-ray beams emitted in multiple segments are overlapped in time.
8. The method for modulating the circumferential and axial uniform distribution of the dose of the X-ray tube for irradiation as set forth in claim 7, wherein the controlling of the irradiation dose in the axial and circumferential directions is specifically:
D＝D1(U1)+D2(U2)
wherein D is the average total dose distribution when the electron beams alternately bombard on the position A and the position B; d1(U1) To make the voltage at the deflection grid (9) be U1Then, the electron ring bombards the dose distribution outside the tube at the axial position A; d2(U2) To make the voltage at the deflection grid (9) be U2The electron ring bombards the dose distribution outside the tube at axial position B.
9. The method for modulating the circumferential and axial uniformity of dose distribution in an X-ray tube for irradiation as set forth in any one of claims 4 to 6, comprising the steps of:
after an electron beam (1) is emitted from a cathode filament (2) along the axial direction of an anode cylinder (5), under the action of an accelerating electric field between a cathode head (3) and the anode cylinder (5) and the action of a deflecting magnetic field of a deflecting coil (4), the electron beam is accelerated and deflected to bombard an X-ray conversion target (6), an annular bombardment band is formed along with the change of the direction of the magnetic field, and X-ray beams uniformly emitted in the circumferential direction are generated after time averaging;
the size of the deflection magnetic field is changed by adjusting the current of the deflection coil (4), a plurality of X-ray beams which are annular bombardment zones and distributed in a segmented and interval mode in the axial direction are formed, and the irradiation dose is regulated and controlled to be uniformly distributed in the axial direction and the circumferential direction after the annular X-ray beams emitted in multiple segments are overlapped in time.
10. The method for modulating the circumferential and axial uniform distribution of the dose of the X-ray tube for irradiation as set forth in claim 9, wherein the controlling of the irradiation dose in the axial and circumferential directions is specifically:
D＝D1(I1)+D2(I2)
wherein D is the average total dose distribution when the electron beams alternately bombard on the position A and the position B; d1(I1) When the current of the deflection coil is I1Then, the electron ring bombards the dose distribution outside the tube at the axial position A; d2(I2) When the current of the deflection coil is I2The electron ring bombards the dose distribution outside the tube at axial position B.
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| US11101096B2 (en) * | 2014-12-31 | 2021-08-24 | Rad Source Technologies, Inc. | High dose output, through transmission and relective target X-ray system and methods of use |
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