JPH0778560B2 - Linac for electron beam irradiation - Google Patents

Linac for electron beam irradiation

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Publication number
JPH0778560B2
JPH0778560B2 JP10546090A JP10546090A JPH0778560B2 JP H0778560 B2 JPH0778560 B2 JP H0778560B2 JP 10546090 A JP10546090 A JP 10546090A JP 10546090 A JP10546090 A JP 10546090A JP H0778560 B2 JPH0778560 B2 JP H0778560B2
Authority
JP
Japan
Prior art keywords
electron beam
window
linac
electron
scanning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP10546090A
Other languages
Japanese (ja)
Other versions
JPH045600A (en
Inventor
正治 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP10546090A priority Critical patent/JPH0778560B2/en
Publication of JPH045600A publication Critical patent/JPH045600A/en
Publication of JPH0778560B2 publication Critical patent/JPH0778560B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、電子線を被照射物に照射し滅菌を行うため
の電子線照射用ライナックに関するものである。
TECHNICAL FIELD The present invention relates to an electron beam irradiation linac for irradiating an irradiation target with an electron beam to sterilize the irradiation target.

[従来の技術] 第4図および第5図は従来の電子線照射用ライナックで
あり、図において、(1)は電子銃、(2)は加速管、
(3)は加速管(2)に取付けられたスキャン用真空ダ
クト、(4a)(4b)はスキャン用真空ダクトに取付けら
れた対向1対のスキャン用コイルである。(9)は被照
射物であり矢印(10)の方向へベルトコンベア等により
移動される。
[Prior Art] FIGS. 4 and 5 show a conventional linac for electron beam irradiation, in which (1) is an electron gun, (2) is an accelerating tube,
(3) is a scanning vacuum duct attached to the accelerating tube (2), and (4a) and (4b) are a pair of opposing scanning coils attached to the scanning vacuum duct. Reference numeral (9) denotes an object to be irradiated, which is moved in the direction of arrow (10) by a belt conveyor or the like.

また、第6図において、(5)は電子ビームを真空ダク
トの外へ取出すためのビーム取出し窓、(6)はビーム
取出し窓(5)をスキャン用真空ダクトに取付けるため
のフランジ、(8)はボルトである。
Further, in FIG. 6, (5) is a beam extraction window for extracting the electron beam out of the vacuum duct, (6) is a flange for attaching the beam extraction window (5) to the scanning vacuum duct, and (8). Is a bolt.

次に動作について説明する。電子銃(1)より出た電子
ビームは加速管(2)内でマイクロ波の電界で5〜10Me
V程度に加速される。この電子ビームは、スキャン用真
空ダクト(3)に取付けられたスキャン用コイル(4a)
(4b)でスキャンされ、チタン箔のビーム取出し窓
(5)を通過して大気中に取出され、被照射物(9)に
照射される。被照射物(9)は例えば注射針、医用ゴム
栓等の医薬部品であり、100%滅菌されていなければな
らないもので、電子線を照射することにより、これを達
成させている。被照射物(9)はベルトコンベア等によ
り照射室外部より運ばれ、ビーム取出し窓(5)の下を
通過するときに電子ビームを照射される。被照射物
(9)は通常ダンボール箱等にはいっており、その幅に
亘って均一に電子線を照射する必要があり、スキャン用
コイル(4a)(4b)によって電子線をスキヤンさせ、照
射線量がほぼ均一になるようにしている。
Next, the operation will be described. The electron beam emitted from the electron gun (1) is 5-10 Me in the electric field of the microwave in the accelerating tube (2).
Accelerated to about V. This electron beam is a scanning coil (4a) attached to the scanning vacuum duct (3).
It is scanned in (4b), passes through the beam extraction window (5) of the titanium foil, is extracted into the atmosphere, and is irradiated onto the irradiation target (9). The irradiated object (9) is, for example, a medical part such as an injection needle or a medical rubber stopper, and must be 100% sterilized. This is achieved by irradiating with an electron beam. The irradiation target (9) is carried from the outside of the irradiation chamber by a belt conveyor or the like, and is irradiated with an electron beam when passing under the beam extraction window (5). The object to be irradiated (9) is usually placed in a cardboard box or the like, and it is necessary to uniformly irradiate the electron beam across its width. The scanning coils (4a) and (4b) scan the electron beam and the irradiation dose Is almost uniform.

[発明が解決しようとする課題] 従来の電子線照射用ライナックは以上のように構成され
ているので、ビーム取出し窓が通常100〜200mm×500〜6
00mmと大きく、窓の冷却が難しい。真空リークが生じや
すい、制作が困難である、窓が破損し易すく破損した場
合の窓材の箔片による加速管、電子銃等への影響が大き
く修理が困難である等の問題点があった。
[Problems to be Solved by the Invention] Since the conventional linac for electron beam irradiation is configured as described above, the beam extraction window is usually 100 to 200 mm × 500 to 6
It is as big as 00mm, and it is difficult to cool the window. There are problems that vacuum leaks are likely to occur, production is difficult, and when the window is easily damaged, the foil piece of the window material has a large effect on the accelerator tube, electron gun, etc. and it is difficult to repair. It was

この発明は上記のような問題点を解消するためになされ
たもので、電子ビームのパルス幅が5〜10μs程度、繰
返しが数100pps程度で運転される電子線照射用ライナッ
クであって、ビーム取出し窓の製作および冷却が容易
で、ビーム取出し窓での真空リークが生じにくい電子線
照射用ライナックを得ることを目的とする。
The present invention has been made to solve the above problems, and is an electron beam irradiation linac which is operated at a pulse width of an electron beam of about 5 to 10 μs and a repetition of about several hundred pps. It is an object of the present invention to obtain a linac for electron beam irradiation, which is easy to manufacture and cool a window, and is less likely to cause a vacuum leak at the beam extraction window.

[課題を解決するための手段] この発明に係る電子線照射用ライナックは、ビーム取出
し窓を複数個に分割してスキャン用真空ダクトに取付け
るとともに、スキャンの周波数を電子ビームのパルスに
同期させ、電子ビームが分割された複数個のビーム取出
し窓から大気中に取出すことができるようにしたもので
ある。
[Means for Solving the Problems] In the linac for electron beam irradiation according to the present invention, the beam extraction window is divided into a plurality of parts and attached to a scanning vacuum duct, and the scanning frequency is synchronized with the electron beam pulse. The electron beam can be extracted into the atmosphere through a plurality of divided beam extraction windows.

[作用] この発明においては、電子ビームのパルスに同期したス
キャンにより、スキャン用真空ダクト内の固定された何
本かのビームラインのみを通ることにより、小さなビー
ム取出し窓をそのライン上に配置すればよく、大きな長
方形またはレーストラック形のビーム取出し窓が不要と
なる。
[Operation] According to the present invention, a small beam extraction window is arranged on the line by passing only some fixed beam lines in the scanning vacuum duct by scanning synchronized with the pulse of the electron beam. This eliminates the need for large rectangular or racetrack beam exit windows.

[実施例] 以下、この発明の一実施例を図について説明する。第1
図、第2図において(11a),(11b),(11c),(11
d)は分割されたビーム取出し窓でありスキャン用真空
ダクト(3)に取付けられている。ビーム取出し窓(11
a)〜(11d)の下部には電子ビームを散乱させ拡げるた
めの電子線スキャタラ(14)が配置されている。(15
a),(15b),(15c),(15d)は電子ビームを表わし
ている。
[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
(11a), (11b), (11c), (11
Reference numeral d) is a divided beam extraction window, which is attached to the scanning vacuum duct (3). Beam extraction window (11
Below the a) to (11d), an electron beam scatterer (14) for scattering and expanding the electron beam is arranged. (15
a), (15b), (15c), and (15d) represent electron beams.

また、第3図において、(12a)はビーム取出し窓(11
a)のフランジであり、(13a)はビーム取出し窓のフラ
ンジ(12a)に取付られたチタン箔である。(12b),
(12c),(12d)および(13b),(13c),(13d)は
それぞれビーム取出し窓(11b),(11c),(11d)の
フランジおよびチタン箔である。
Further, in FIG. 3, (12a) is a beam extraction window (11
It is a flange of a), and (13a) is a titanium foil attached to the flange (12a) of the beam extraction window. (12b),
(12c), (12d) and (13b), (13c), (13d) are beam extraction windows (11b), (11c) and (11d) flanges and titanium foil, respectively.

次に動作について述べる。加速管(2)で加速された電
子ビームは、電子ビームのパルスに同期した電流をスキ
ャン用コイル(4a)(4b)に流すと、例えば(15a),
(15b),(15c),(15d)の4本のビームラインのみ
を通る。この4本のビームライン上にそれぞれ小さなビ
ーム取出し窓(11a),(11b),(11c),(11d)が設
けられているので、この4個のビーム取出し窓よりそれ
ぞれ等しいビーム電流を取出すことができ、しかもこれ
らのビーム取出し窓(11a)〜(11d)以外のスキャン用
真空ダクト内にはビームが当たらないようにすることが
できる。ビームのパルス幅が5〜10μs程度であれば、
スキャン用コイル(4a)(4b)に流す電流の周波数を数
100Hz程度以下にしておけば、ビームライン(15a),
(15b),(15c),(15d)はそれぞれ1本の直線と見
做してよいので、ビーム取出し窓(11a),(11b),
(11c),(11d)はビームがスキャンされる方向に長く
する必要はない。ビーム取出し窓(11a),(11b),
(11c),(11d)から大気へ出た電子ビームは電子線ス
キャタラ(14)で散乱され、被照射物(9)の位置でほ
ぼ均一な線量分布にすることができる。
Next, the operation will be described. The electron beam accelerated by the accelerating tube (2), when a current synchronized with the pulse of the electron beam is passed through the scanning coils (4a) (4b), for example, (15a),
Only the four beam lines (15b), (15c), and (15d) pass through. Since small beam extraction windows (11a), (11b), (11c), (11d) are provided on these four beam lines respectively, it is necessary to extract equal beam currents from these four beam extraction windows. In addition, the beam can be prevented from hitting the scanning vacuum duct other than the beam extraction windows (11a) to (11d). If the pulse width of the beam is about 5-10 μs,
The number of frequencies of the current flowing through the scanning coils (4a) (4b)
If you keep the frequency below 100Hz, the beam line (15a),
Since each of (15b), (15c), and (15d) can be regarded as one straight line, the beam extraction windows (11a), (11b),
(11c) and (11d) do not need to be long in the beam scanning direction. Beam extraction windows (11a), (11b),
The electron beams emitted from (11c) and (11d) to the atmosphere are scattered by the electron beam scatterer (14), and the dose distribution can be made almost uniform at the position of the irradiation target (9).

なお、上記実施例は、ビームラインが4本の場合につい
て説明したが、これは複数本であればよく、上記実施例
と同様の効果を奏する。
Although the above embodiment has described the case where the number of beam lines is four, a plurality of beam lines may be used, and the same effect as that of the above embodiment can be obtained.

また、上記実施例では、電子線スキャタラを1つ設けた
ものについて示したが、ビーム取出し窓の加速管側のス
キャン用真空ダクト内にもう1つの電子線スキャタラを
追加し、ビームの径を太くしておき、それをビーム取出
し窓の下に設けた2番目の電子線スキャタラで散乱させ
れば、線量分布の均一度をさらに向上することができ
る。
Further, in the above embodiment, one electron beam scatterer is provided, but another electron beam scatterer is added in the scanning vacuum duct on the side of the beam extraction window on the acceleration tube side to increase the beam diameter. Incidentally, if it is scattered by the second electron beam scatterer provided below the beam extraction window, the uniformity of dose distribution can be further improved.

さらに、ビーム取出し窓の部分では電子ビームが比較的
細いので、この部分にカレントトランスを取付け、それ
ぞれのビーム取出し窓から出てくるビーム電流をモニタ
することが可能で、それによって、スキャンコイルの電
流が電子ビームのパルスに同期しているか、および分布
が均一になっているかを常時チェックすることができ
る。
Furthermore, since the electron beam is relatively thin at the beam extraction window, it is possible to attach a current transformer to this part and monitor the beam current emerging from each beam extraction window. It can be checked at all times whether is synchronized with the pulse of the electron beam and whether the distribution is uniform.

[発明の効果] 以上のように、この発明によれば、スキャン用コイルの
電流を電子ビームのパルスに同期させ、ビーム取出し窓
を小さくして複数個設けるようにしたので、ビーム取出
し窓の信頼性が高まり、装置が安価になる効果がある。
EFFECTS OF THE INVENTION As described above, according to the present invention, the current of the scanning coil is synchronized with the pulse of the electron beam, and the plurality of beam extraction windows are provided to be small. As a result, there is an effect that the device becomes cheaper and the device becomes cheaper.

さらに、窓の破損が生じにくくなると同時に、破損した
場合も窓が小さいので、窓材の箔片による加速管、電子
銃への影響が少なくなり、修理が容易になること、およ
び窓材の箔片が窓破損時に加速管、電子銃へ侵入するこ
とを防ぐためのゲートバルブや保護弁が不要となり、装
置のシステムが簡単で安価になる効果がある。
Further, the window is less likely to be damaged, and when the window is damaged, the window is small, so that the foil piece of the window material has less influence on the acceleration tube and the electron gun, and the repair is easy. There is no need for a gate valve or a protection valve to prevent the piece from entering the accelerating tube or the electron gun when the window is broken, and the system of the device is simple and inexpensive.

【図面の簡単な説明】[Brief description of drawings]

第1図、第2図および第3図はこの発明の一実施例を示
し、第1図は正面図、第2図は側面図、第3図は第1図
のIII−III線に沿う下面図である。 第4図、第5図および第6図は従来の電子線照射用ライ
ナックを示し、第4図は正面図、第5図は側面図、第6
図は第4図のVI−VI線に沿う下面図である。 (2)……加速管、(4a)(4b)……スキャン用コイ
ル、(11a),(11b),(11c),(11d)……ビーム取
出し窓、(14)……電子線スキャタラ。 なお、各図中、同一符号は同一又は相当部分を示す。
FIGS. 1, 2 and 3 show an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a lower surface taken along line III-III in FIG. It is a figure. 4, 5, and 6 show a conventional electron beam irradiation linac, FIG. 4 is a front view, FIG. 5 is a side view, and FIG.
The drawing is a bottom view taken along the line VI-VI in FIG. (2) …… Accelerator, (4a) (4b) …… Scanning coil, (11a), (11b), (11c), (11d) …… Beam extraction window, (14) …… Electron beam scatterer. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】パルス運転される電子線照射用ライナック
において、電子ビームパルスに同期して運転されるスキ
ャン用コイルと、複数個のビーム取出し窓と、このビー
ム取出し窓の下部に設けられた電子スキャタラとを備え
てなることを特徴とする電子線照射用ライナック。
1. A pulse-operated linac for electron beam irradiation, a scanning coil operated in synchronization with an electron beam pulse, a plurality of beam extraction windows, and an electron provided below the beam extraction window. A linac for electron beam irradiation, which comprises a scatterer.
JP10546090A 1990-04-23 1990-04-23 Linac for electron beam irradiation Expired - Fee Related JPH0778560B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10546090A JPH0778560B2 (en) 1990-04-23 1990-04-23 Linac for electron beam irradiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10546090A JPH0778560B2 (en) 1990-04-23 1990-04-23 Linac for electron beam irradiation

Publications (2)

Publication Number Publication Date
JPH045600A JPH045600A (en) 1992-01-09
JPH0778560B2 true JPH0778560B2 (en) 1995-08-23

Family

ID=14408194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10546090A Expired - Fee Related JPH0778560B2 (en) 1990-04-23 1990-04-23 Linac for electron beam irradiation

Country Status (1)

Country Link
JP (1) JPH0778560B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003049994A (en) * 2001-08-03 2003-02-21 Ito Koki Kk Drain valve for lpg tank
JP2016109656A (en) * 2014-12-08 2016-06-20 メック株式会社 Uniformizing distribution method and device of charged particle flux

Also Published As

Publication number Publication date
JPH045600A (en) 1992-01-09

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