JPH11118998A - Irradiation utilization x-ray generation device due to electron accelerator - Google Patents
Irradiation utilization x-ray generation device due to electron acceleratorInfo
- Publication number
- JPH11118998A JPH11118998A JP28176197A JP28176197A JPH11118998A JP H11118998 A JPH11118998 A JP H11118998A JP 28176197 A JP28176197 A JP 28176197A JP 28176197 A JP28176197 A JP 28176197A JP H11118998 A JPH11118998 A JP H11118998A
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- target
- targets
- rays
- irradiation
- ray
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、放射線照射によ
り、材料の改質や医療器貝の滅菌等を行う産業に用いる
ためのＸ線発生装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray generator for use in the industry for modifying materials, sterilizing medical instruments and the like by irradiation with radiation.
【０００２】[0002]
【従来の技術】照射利用に用いるＸ線は、ほとんどの揚
合、高エネルギー電子線をタングステン、金、タンタル
などの高原子番号物質製の板（ターゲット）に照射させ
ることによる制動放射により発生させており、これは公
知の方法である。2. Description of the Related Art X-rays used for irradiation are generated by bremsstrahlung caused by irradiating a plate (target) made of a high atomic number material such as tungsten, gold, tantalum or the like with most of high energy and high energy electron beams. This is a known method.
【０００３】産業に用いる場合には、１ｋＧｙ／ｈから
１００ｋＧｙ／ｈ程度の高線量率のＸ線を発生させる必
要があり、このため数ｍＡから数１０ｍＡの大電流の加
速電子線を１枚の板状あるいは回転体のターゲットに照
射することにより発生させていた。In the case of industrial use, it is necessary to generate X-rays at a high dose rate of about 1 kGy / h to 100 kGy / h. Therefore, a high current acceleration electron beam of several mA to several tens mA is required for one sheet. It is generated by irradiating a plate-shaped or rotating target.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記の方式で
は大電流の電子線を照射することによりターゲットの発
熱が著しくなり、その冷却が困難となったり、また照射
野がターゲット背面の一定位置に固定されるので、被照
射物に対し効率良い照射が行われないこと、また、発生
させたＸ線の線量率が狭い空間で大きく異なる分布とな
るなど、解決を要する課題があった。However, in the above-described method, the target is heated significantly by irradiating a high-current electron beam, which makes it difficult to cool the target or that the irradiation field is located at a certain position on the back surface of the target. There is a problem that needs to be solved, for example, that the object to be irradiated cannot be efficiently irradiated because it is fixed, and that the dose rate of the generated X-ray has a significantly different distribution in a narrow space.
【０００５】[0005]
【課題を解決するための手段】本発明はターゲットの発
熱を押さえるための手段として、一枚のターゲットに全
電子線を照射するのでなく、複数のターゲットを用い、
これに全電子線を分散させて照射することにより、広い
空間面積（幅ｌｍ以上、高さ０．３ ｍを越えるＸ線の
投影面積）に毎時ｌｋＧｙから １００ｋＧｙの高線量
率の転換Ｘ線を発生させるものである。また、この複数
のターゲットの配置により、発生するＸ線の線量率分布
を被照射物の寸法に応じて調整するものである。The present invention uses a plurality of targets as a means for suppressing heat generation of the targets, instead of irradiating a single target with all electron beams.
By irradiating all the electron beams in a dispersed manner, conversion X-rays with a high dose rate of lkGy to 100 kGy / h can be applied to a wide space area (projection area of X-rays having a width of 1 m or more and a height of more than 0.3 m). To be generated. Further, by arranging the plurality of targets, the dose rate distribution of the generated X-rays is adjusted according to the size of the irradiation object.
【０００６】ターゲットの材質としてはＸ線への変換効
率が高い高原子番号物質を用い、その厚さは入射電子の
飛程程度とし、発生したＸ線の自己吸収を極力抑えると
ともに、電子線の透過を防ぐものとする。As a material of the target, a high atomic number substance having a high conversion efficiency to X-rays is used, the thickness thereof is set to a range of incident electrons, and the self-absorption of generated X-rays is suppressed as much as possible. Transmission shall be prevented.
【０００７】このターゲット板を複数用い、これを加速
器からの電子線が放出されている空間に配置し、各ター
ゲット間の間隔、角度及び各ターゲットの電子線入射面
積を調整することにより、各ターゲットの熱負荷と発生
するＸ線の線量率分布を調整するものである。By using a plurality of target plates, disposing them in a space where an electron beam is emitted from an accelerator, and adjusting the interval and angle between each target and the electron beam incidence area of each target, And the dose rate distribution of the generated X-rays.
【０００８】[0008]
【発明の実施の形態】本発明の装置は、各ターゲットお
よび電子線入射窓を有し、全ターゲット板を収納して各
ターゲットの位置を設定できる構造のＸ線発生容器及び
その冷却系から構成される。ターゲットの冷却は、各タ
ーゲットそれぞれが薄い冷却水槽を待つ構造とし、これ
に水を流すことにより行う。Ｘ線発生容器内はヘリウム
やアルゴンガスの雰囲気とすることにより、オソンの発
生を防ぐとともに補助的に容器内の冷却も行うものとす
る。次ぎに、本発明の実施例を図に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus according to the present invention comprises an X-ray generation container having each target and an electron beam incident window, having a structure capable of accommodating all target plates and setting the position of each target, and a cooling system thereof. Is done. The target is cooled by a structure in which each target waits for a thin cooling water tank, and water is supplied to the target. By setting the inside of the X-ray generation container to an atmosphere of helium or argon gas, generation of oson is prevented, and the inside of the container is additionally cooled. Next, an embodiment of the present invention will be described with reference to the drawings.
【０００９】[0009]
【実施例１】図１は、本発明のＸ線発生装置１の一例を
示し、この装置が電子加速器４の下にセットされた状態
を示す。ここに示すように、薄いステンレス製のＸ綿発
生容器内には金、タングステン、タンタル等からなる複
数のターグット板２が設けられている。このターゲット
板は、角度可変に設けられており、また電子線入射窓３
を通して入射した電子線をその全体のターゲットで分担
するように配置されており、また各ターゲット間の縦方
向の間隔は変化できるように構成されている。Embodiment 1 FIG. 1 shows an example of an X-ray generator 1 of the present invention, and shows a state in which the X-ray generator 1 is set under an electron accelerator 4. As shown here, a plurality of target plates 2 made of gold, tungsten, tantalum or the like are provided in a thin stainless steel X cotton generating container. This target plate is provided so as to be variable in angle, and has an electron beam entrance window 3.
Are arranged so as to share the electron beam incident thereon through the entire target, and the vertical interval between the targets can be changed.
【００１０】各ターゲット自身は、水冷できるように薄
い冷却水槽を有したものとなっており、またＸ線発生容
器内はヘリウム又はアルゴンカスを充填することによ
り、有害なオソンの発生を防ぐとともに容器内の冷却に
も役立っている。冷却水及びヘリウム又はアルゴンガス
はＸ線発生容器の外部より供給される。Each target itself has a thin cooling water tank for water cooling. The inside of the X-ray generation container is filled with helium or argon gas to prevent generation of harmful oson and to prevent the generation of harmful oson. It is also useful for cooling. Cooling water and helium or argon gas are supplied from outside the X-ray generation container.
【００１１】図２は、ターゲットの配置をわかり易く示
すため、入射する電子線５のビーム走査に対し直角方向
から見た図である。ここに示すように各ターゲットはビ
ーム中心軸からの距離を変化させて配置され、ビーム入
射面積が調整できるようにこの距離及び設置角度が可変
になっている。また、この配置における縦方向のターゲ
ット板間隔を変化させることにより、発生するＸ線６の
場の広さを変化させることができる。被照射物又は被照
射試料用の容器７の照射位置は主にＸ線発生容器の横側
となるが、容器の底面を用いることもできる。FIG. 2 is a view seen from a direction perpendicular to the beam scanning of the incident electron beam 5 to clearly show the arrangement of the targets. As shown here, each target is arranged at a different distance from the beam center axis, and the distance and the installation angle are variable so that the beam incident area can be adjusted. Also, by changing the vertical target plate interval in this arrangement, the field width of the generated X-rays 6 can be changed. The irradiation position of the irradiation object or the irradiation sample container 7 is mainly on the side of the X-ray generation container, but the bottom surface of the container may be used.
【００１２】[0012]
【実施例２】ターゲットに厚さｌ ｍｍ の金の板を用
い、電子線の入射方向に対し４５°の角度に設置し、３
ＭｅＶの電子線で４ｃｍ2のスリットを通して ９．４μ
Ａのビーム電流（加速器からの全ビーム電流ｌｍＡ）で
Ｘ線を発生させた場合、電子線の入射方向と直角方向
で、ターゲットから１５ｃｍの距離において約２ｋＧｙ
／ｈの線量率が得られた。Example 2 A gold plate having a thickness of l mm was used as a target, and was set at an angle of 45 ° with respect to the incident direction of an electron beam.
9.4μ with MeV electron beam through 4cm 2 slit
When X-rays are generated with the beam current of A (the total beam current from the accelerator is 1 mA), about 2 kGy at a distance of 15 cm from the target in a direction perpendicular to the incident direction of the electron beam.
/ H dose rate was obtained.
【００１３】このデータより、一般的な加速器を用いて
十分取り出し可能な、全電子流を３０ｍＡとした場合に
は、６０ｋＧｙ／ｈの線量率が発生でき、その照射量
は、ターゲットに入射する電子線の走査方向については
走査幅となる。また電子線の入射方向については、ター
ゲットの設置角度、枚数及び各ターゲット間の距離によ
り変化し、被照射物の寸法に合わせることができる。According to this data, when the total electron flow is 30 mA, which can be sufficiently extracted by using a general accelerator, a dose rate of 60 kGy / h can be generated, and the irradiation amount is determined by the amount of electrons incident on the target. The scanning width is the scanning width in the line scanning direction. The incident direction of the electron beam varies depending on the installation angle of the targets, the number of the targets, and the distance between the targets, and can be adjusted to the size of the irradiation target.
【００１４】[0014]
【発明の効果】本発明のＸ線発生装置を用いることによ
り、電子線の入射方向についてのＸ線の照射野の寸法を
調整することができ、またその装置の横が照射位置とな
るので、電子線が垂直方向ビームの場合にターゲットと
床面との距離を短くとることができ、照射室の建設費削
減ができる。さらに、各ターゲットに入射する電子線を
複数のターゲットで分担するので、冷却が容易となり、
また大出力のＸ線発生源となり得る。By using the X-ray generator of the present invention, the size of the X-ray irradiation field in the direction of incidence of the electron beam can be adjusted, and the irradiation position is located beside the device. When the electron beam is a vertical beam, the distance between the target and the floor can be reduced, and the construction cost of the irradiation room can be reduced. Furthermore, since the electron beam incident on each target is shared by a plurality of targets, cooling becomes easy,
In addition, it can be a large output X-ray source.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明のＸ線発生装置が電子線加速器の下に
セットされた状態を示す図である。FIG. 1 is a diagram showing a state in which an X-ray generator according to the present invention is set below an electron beam accelerator.
【図２】 本発明のＸ線発生装置を、入射する電子線の
ビーム走査に対し直角方向から見た断面図である。FIG. 2 is a cross-sectional view of the X-ray generator according to the present invention when viewed from a direction perpendicular to the beam scanning of an incident electron beam.
１：Ｘ線発生容器、２：ターゲット板、３：電子線入射
窓、４：電子加速器の電子線放出部、５：加速器から放
出される電子線、６：ターゲット板から発生するＸ線、
７：被照射物又は試料容器1: an X-ray generation container, 2: a target plate, 3: an electron beam incident window, 4: an electron beam emitting portion of an electron accelerator, 5: an electron beam emitted from the accelerator, 6: an X-ray generated from the target plate,
7: Irradiated object or sample container
───────────────────────────────────────────────────── フロントページの続き (72)発明者 瀬口 忠男 群馬県高崎市綿貫町1233番地 日本原子力 研究所高崎研究所内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tadao Seguchi 1233 Watanukicho, Takasaki City, Gunma Prefecture Japan Atomic Energy Research Institute Takasaki Research Institute
Claims (1)
全電子線を有効に利用して広い空間面積に高線量率の転
換Ｘ線を発生させることを特徴とする電子加速器による
照射利用Ｘ線発生装置。1. An X-ray irradiating by an electron accelerator, wherein a plurality of target plates are used, and a converted X-ray having a high dose rate is generated in a wide space area by effectively utilizing all incident electron beams. Generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28176197A JP3803845B2 (en) | 1997-10-15 | 1997-10-15 | X-ray generator using electron accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28176197A JP3803845B2 (en) | 1997-10-15 | 1997-10-15 | X-ray generator using electron accelerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11118998A true JPH11118998A (en) | 1999-04-30 |
| JP3803845B2 JP3803845B2 (en) | 2006-08-02 |
Family
ID=17643615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28176197A Expired - Fee Related JP3803845B2 (en) | 1997-10-15 | 1997-10-15 | X-ray generator using electron accelerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3803845B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424758A (en) * | 2022-09-30 | 2022-12-02 | 中广核戈瑞(深圳)科技有限公司 | Radiation shielding mechanism of electron irradiation accelerator and method thereof |
-
1997
- 1997-10-15 JP JP28176197A patent/JP3803845B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424758A (en) * | 2022-09-30 | 2022-12-02 | 中广核戈瑞(深圳)科技有限公司 | Radiation shielding mechanism of electron irradiation accelerator and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3803845B2 (en) | 2006-08-02 |
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