JPH083986B2 - Radiotherapy equipment - Google Patents

Radiotherapy equipment

Info

Publication number
JPH083986B2
JPH083986B2 JP1148328A JP14832889A JPH083986B2 JP H083986 B2 JPH083986 B2 JP H083986B2 JP 1148328 A JP1148328 A JP 1148328A JP 14832889 A JP14832889 A JP 14832889A JP H083986 B2 JPH083986 B2 JP H083986B2
Authority
JP
Japan
Prior art keywords
electrode
electrodes
monitor
chamber
corrugated
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 - Lifetime
Application number
JP1148328A
Other languages
Japanese (ja)
Other versions
JPH0315483A (en
Inventor
敏允 鈴木
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 JP1148328A priority Critical patent/JPH083986B2/en
Publication of JPH0315483A publication Critical patent/JPH0315483A/en
Publication of JPH083986B2 publication Critical patent/JPH083986B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、放射線治療装置、特に、その放射線出力
モニターに関するものである。
TECHNICAL FIELD The present invention relates to a radiation therapy apparatus, and more particularly to a radiation output monitor thereof.

〔従来の技術〕[Conventional technology]

第6図は、例えば、United State Patent第3,808,441
号明細書に示されている従来の電離箱形放射線出力モニ
ターのモニターチェンバーの断面図である。
FIG. 6 shows, for example, United State Patent No. 3,808,441.
FIG. 6 is a cross-sectional view of a monitor chamber of a conventional ionization chamber type radiation output monitor shown in the specification.

図において、符号(1)は放射された放射線、例え
ば、X線、(2)は遮蔽板、(3)は平板な高電圧電
極、(4)は高電圧電極(3)を電気的に絶縁し、か
つ、機械的に支えている絶縁体、(5)は平板な集電
極、(6)は仕切板、(7)及び(8)は平板なD形集
電極、(9)は高電圧電極(3)又は集電極(5)又は
D形集電極(7),(8)に接続され、高電圧印加又は
信号のひき出しのためのコネクター、(10)はケースで
ある。
In the figure, reference numeral (1) denotes emitted radiation, for example, X-rays, (2) a shielding plate, (3) a flat high-voltage electrode, (4) electrically insulating the high-voltage electrode (3). And a mechanically supporting insulator, (5) is a flat collector electrode, (6) is a partition plate, (7) and (8) are flat D-shaped collector electrodes, and (9) is a high voltage. A connector (10) connected to the electrode (3) or the collecting electrode (5) or the D-shaped collecting electrodes (7) and (8) for applying a high voltage or extracting a signal is a case.

次に、第7図は従来のモニターチェンバーの一部の拡
大図、第8図はイオンチェンバーの一部を示す断面図、
第9図はチェンバーが熱的変化を受けたときの変形例を
示す断面図である。
Next, FIG. 7 is an enlarged view of a part of the conventional monitor chamber, and FIG. 8 is a sectional view showing a part of the ion chamber,
FIG. 9 is a cross-sectional view showing a modified example when the chamber is subjected to a thermal change.

次に上記従来装置の動作について説明する。 Next, the operation of the conventional device will be described.

高電圧電極(3)、集電極(5)及びD形集電極
(7),(8)のそれぞれが絶縁体(4)を間にはさん
で交互に重ね合わされている。
Each of the high-voltage electrode (3), the collecting electrode (5), and the D-shaped collecting electrodes (7) and (8) is alternately stacked with the insulator (4) interposed therebetween.

高電圧電極(3)、絶縁体(4)及び集電極(5)又
はD形電極(7),(8)で形成される空間をX線
(1)が通過するとき、この空間をみたしている空気を
電離し、この電離電荷が集電極(5)又はD形電極
(7),(8)に集まり、コネクター(9)を介して増
幅器に送られ放射線出力モニターのメータに出力され
る。
When the X-ray (1) passes through the space formed by the high-voltage electrode (3), the insulator (4) and the collecting electrode (5) or the D-shaped electrodes (7) and (8), this space is filled. Ionizing air is ionized, and the ionized charges are collected on the collecting electrode (5) or the D-shaped electrodes (7) and (8), sent to the amplifier through the connector (9) and output to the meter of the radiation output monitor. .

高電圧電極(3)、絶縁体(4)、集電極(5)、仕
切板(6)及びD形電極(7),(8)は、遮蔽板
(2)及びケース(10)の中に入れられ、電気的に外部
と遮断されており、電源や信号の受授はコネクター
(9)を介して行なわれる。
The high voltage electrode (3), the insulator (4), the collector electrode (5), the partition plate (6) and the D-shaped electrodes (7) and (8) are placed in the shield plate (2) and the case (10). It is put in and electrically cut off from the outside, and the exchange of power and signals is performed through the connector (9).

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

従来の放射線治療装置の放射線出力モニターのモニタ
ーチェンバーは、以上のように構成されているので、モ
ニター出力の精度を保つためには、X線又は放射線でイ
オン化される高電圧と集電極間の空間を一定の容積に保
たねばならないが、正常温度では第8図に示すように、
電極等が正確な形状を保っていても、温度変化により、
絶縁体(4)が収縮した場合には、第9図に示すよう
に、電極等が変形して、容積が変化する。従って、変形
を避けるためには、各電極を厚くしたり、強度を増した
りとすると共に、温度を一定に保たせたりすることが必
要である。
Since the monitor chamber of the radiation output monitor of the conventional radiation therapy apparatus is configured as described above, in order to maintain the accuracy of the monitor output, the space between the high voltage ionized by X-rays or radiation and the collector electrode is maintained. Must be maintained at a constant volume, but at normal temperature, as shown in FIG.
Even if the electrodes etc. keep their accurate shape, due to temperature changes,
When the insulator (4) contracts, as shown in FIG. 9, the electrodes and the like deform and the volume changes. Therefore, in order to avoid deformation, it is necessary to increase the thickness of each electrode, increase its strength, and keep the temperature constant.

しかし、このように、電極を厚くすると、電子線など
の粒子線の出力モニターができなくなり、そのため、薄
くすれば、各電極の変形が容易に起こり、イオン化容積
が変化して見かけの出力が変化してしまうなどの問題点
があり、このような問題点を解決したいという課題を従
来装置は有していた。
However, if the electrodes are thickened in this way, the output of particle beams such as electron beams cannot be monitored.Therefore, if they are thinned, the deformation of each electrode easily occurs, the ionization volume changes, and the apparent output changes. However, the conventional device has a problem of wanting to solve such a problem.

この発明は、上記のような課題を解決するためになさ
れたもので、各電極はその厚さが薄くても変形が起こり
にくい構造にしてモニター精度(再現性)を向上させる
ことができると共に、電極を薄くして電子線のモニター
も行なうことができる放射線出力モニターを備えている
放射線治療装置を得ることを目的とする。
The present invention has been made to solve the above problems, and each electrode can have a structure in which deformation does not easily occur even if the thickness thereof is thin, and monitor accuracy (reproducibility) can be improved, and An object of the present invention is to obtain a radiation treatment apparatus equipped with a radiation output monitor which can also monitor an electron beam by making electrodes thin.

〔課題を解決するための手段〕[Means for solving the problem]

この発明に係る放射線治療装置は、放射線出力モニタ
ーの電離箱形モニターチェンバーの各電極の表裏に同形
の多数の突出部をそれぞれ形成し、かつ互いに対向する
電極の互いに対向する突出部は、互いに同方向へ向けて
同じ大きさに形成したものである。
In the radiation therapy apparatus according to the present invention, a large number of projections of the same shape are formed on the front and back of each electrode of the ionization chamber monitor chamber of the radiation output monitor, and the projections of the electrodes facing each other are the same. It is formed in the same size in the direction.

〔作用〕[Action]

この発明における放射線治療装置の放射線出力モニタ
ーの電離箱形モニターチェンバーは、その電極が、表裏
に同形の多数の突出部を有しているので、温度変化に対
する膨張、収縮に対し、各電極の変形が電極の上下方向
にほぼ等しくなるような変形となり、従って、電極間の
容積はほぼ一定に保たれる。
In the ionization chamber type monitor chamber of the radiation output monitor of the radiation therapy apparatus according to the present invention, since the electrodes have a large number of protrusions of the same shape on the front and back sides, deformation of each electrode due to expansion and contraction due to temperature change. Becomes almost equal in the vertical direction of the electrodes, so that the volume between the electrodes is kept substantially constant.

〔実施例〕〔Example〕

以下、この発明をその一実施例を示す図に基づいて説
明する。なお、符号(1),(2)で示すものは、従来
装置において、同一符号を示しているものと、同一又は
同等のものである。
Hereinafter, the present invention will be described with reference to the drawings showing one embodiment. The reference numerals (1) and (2) are the same as or equivalent to those of the conventional apparatus having the same reference numerals.

第1図は、この発明のモニターチェンバーの一部の拡
大斜視図、第2図は第1図のイオンチェンバーの一つを
示す断面図、第3図はイオンチェンバーが熱変化による
変形をしたときの変形例を示す断面図である。
FIG. 1 is an enlarged perspective view of a part of the monitor chamber of the present invention, FIG. 2 is a cross-sectional view showing one of the ion chambers of FIG. 1, and FIG. 3 is a case where the ion chamber is deformed by heat change. It is sectional drawing which shows the modification.

第1図において、符号(11)は片側が波形面を有する
半波形絶縁体、(12)は表裏に同形の多数の突出部、例
えば、波形突出部を有している高電圧電極で、半波形絶
縁体(11)によって、支えられ絶縁されている。また、
波形は上下に同じ形に突出している波形である。(13)
は両面波形の面をもった波形絶縁体、(14)は同様の波
形突出部を有する波形集電極で、波形絶縁体(13)で支
えられ、絶縁されている。
In FIG. 1, reference numeral (11) is a half-corrugated insulator having a corrugated surface on one side, and (12) is a high voltage electrode having a plurality of protrusions of the same shape on the front and back sides, for example, a high voltage electrode having a corrugated protrusion. It is supported and insulated by the corrugated insulator (11). Also,
The waveform is a waveform that projects vertically in the same shape. (13)
Is a corrugated insulator having double-sided corrugated surfaces, and (14) is a corrugated collector electrode having a similar corrugated protrusion, which is supported and insulated by the corrugated insulator (13).

なお、半波形、波形絶縁体(11),(13)の波形形状
と、高電圧電極(12)、波形集電極(14)の波形形状と
は、全く同形に形成されている。
The waveform shapes of the half-wave and the waveform insulators (11) and (13) and the waveform shapes of the high-voltage electrode (12) and the waveform collector electrode (14) are formed in exactly the same shape.

第2図に示すように波形に形成されている波形高電圧
電極(12a)及び波形集電極(14a)は、熱変化を受ける
と、第3図に示すように、波形がその山側の方すなわち
表裏両側方向へ延びて(12b),(14b)となるが、その
量は表裏はほぼ同量である。
When the corrugated high voltage electrode (12a) and the corrugated collector electrode (14a), which are formed in a corrugated form as shown in FIG. 2, are subjected to thermal change, as shown in FIG. It extends to both sides of the front and back to become (12b) and (14b), but the amount is almost the same on the front and back.

この波形の状態を座標軸によって示すと、第4図のと
おりであり、(12a),(14a)は上記のとおり熱影響を
受けていない場合の高電圧電極及び集電極の波形を、ま
た、(12b),(14b)は熱影響によって変形した場合の
それぞれの波形を示している。
The state of this waveform is shown by the coordinate axes as shown in FIG. 4, and (12a) and (14a) show the waveforms of the high-voltage electrode and the collecting electrode when they are not affected by heat as described above. 12b) and (14b) show the respective waveforms when deformed by the effect of heat.

この第4図において、高電圧電極(12)の波形を y1=a sin(kx+b)+c とし、集電極(14)の波形を y2=a sin(kx+b)+g とする。In FIG. 4, the waveform of the high voltage electrode (12) is y 1 = a sin (kx + b) + c, and the waveform of the collector electrode (14) is y 2 = a sin (kx + b) + g.

従って、このときの両電極間の間隔は y1−y2=c−g となる。Therefore, the distance between both electrodes at this time is y 1 −y 2 = c−g.

いま、熱変形によって絶縁体と電極とに変形が生ずる
と、電極の波形は、変数kがk′に、常数aがa′に変
化する。
When the insulator and the electrode are deformed by the thermal deformation, the variable k changes the variable k to k'and the constant a to a '.

従って、各波形y′,y′は、 y′=a′sim(k′x+b)+c y′=a′sim(k′x+b)+g となり、このときの熱変形による両電極間の間隔y′
−y′はc−gとなって、間隔は湿度変化に対して変
化しない。従って、イオン化空間の容積は、平面内二次
元方向の変化と同等となり、第9図に示した従来のイオ
ンチェンバーの温度変化に対する容積変化に較べて著し
く小さくすることができる。
Therefore, the respective waveforms y ′ 1 and y ′ 2 become y ′ 1 = a′sim (k′x + b) + c y ′ 2 = a′sim (k′x + b) + g, which is due to thermal deformation between both electrodes. interval y '1 of
-Y ' 2 becomes c-g, and the interval does not change with humidity change. Therefore, the volume of the ionization space becomes equivalent to the change in the in-plane two-dimensional direction, and can be made significantly smaller than the volume change of the conventional ion chamber shown in FIG.

なお、上記実施例では温度による変形を小さくするた
め、電極の表裏に設けた同形の多数の突出部として、波
形を設けたものを示したが、これに限らず、例えば、第
5図に示すように、電極(12c),(14c)に、その表裏
に突出すると共に同形の多数の小さな半球状の突出部
(15)を設けてもよい。もちろん、絶縁体(11c),(1
3c)は上記の電極(12c),(14c)に対応して形成され
ている。
In addition, in the above-described embodiment, in order to reduce the deformation due to temperature, a large number of protrusions of the same shape provided on the front and back of the electrode are provided with corrugations, but the present invention is not limited to this, and for example, shown in FIG. As described above, the electrodes (12c) and (14c) may be provided with a large number of small hemispherical protrusions (15) having the same shape and protruding from the front and back. Of course, insulator (11c), (1
3c) is formed corresponding to the electrodes (12c) and (14c).

この場合においても、上記実施例と同様の作用がなさ
れ、かつ、効果を奏する。
Also in this case, the same operation as that of the above-described embodiment is performed and the effect is obtained.

〔発明の効果〕〔The invention's effect〕

以上のように、この発明によれば、電極の表裏に同形
の多数の突出部を設け、かつ互いに対向する電極の互い
に対向する突出部は、互いに同方向へ向けて同じ大きさ
に形成したので、電極間の容積変化がなく、その結果、
電極の厚さを厚くする必要もなく、モニター精度を向上
させ得る放射線出力モニターを備えている放射線治療装
置が得られる効果を有している。
As described above, according to the present invention, a large number of protrusions having the same shape are provided on the front and back surfaces of the electrodes, and the protrusions facing each other of the electrodes are formed in the same size in the same direction. , There is no volume change between the electrodes, and as a result,
There is an effect that a radiation treatment apparatus equipped with a radiation output monitor capable of improving the monitoring accuracy can be obtained without increasing the thickness of the electrode.

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

第1図はこの発明の一実施例のモニターチェンバーの部
分断面斜視図、第2図は第1図のイオンチェンバーの一
部を示す断面図、第3図は、温度等によって引き起こさ
れた変形時の第2図に示す部分を示す断面図、第4図は
波形電極の変形説明線図、第5図はこの発明の他の実施
例のモニターチェンバーの部分断面斜視図、第6図は従
来のモニターチェンバーの断面図、第7図は第6図の一
部の拡大断面図、第8図は第6図のモニターチェンバー
の一つの断面図、第9図は温度変形したときの第8図の
断面図である。 (1)……放射線(X線)、(11),(13),(11
c),(13c)……絶縁体(半波形絶縁体、波形絶縁
体)、(12),(12a),(12b),(12c)……電極
(高電圧電極、波形高電圧電極)、(14),(14a),
(14b),(14c)……電極(集電極、波形集電極)。 なお、各図中、同一符号は同一又は相当部分を示す。
1 is a partial sectional perspective view of a monitor chamber according to an embodiment of the present invention, FIG. 2 is a sectional view showing a part of the ion chamber of FIG. 1, and FIG. 2 is a cross-sectional view showing a portion shown in FIG. 2, FIG. 4 is a modification explanatory diagram of a corrugated electrode, FIG. 5 is a partial cross-sectional perspective view of a monitor chamber of another embodiment of the present invention, and FIG. FIG. 7 is a sectional view of the monitor chamber, FIG. 7 is an enlarged sectional view of a part of FIG. 6, FIG. 8 is a sectional view of one of the monitor chambers of FIG. 6, and FIG. 9 is a sectional view of FIG. FIG. (1) …… Radiation (X-ray), (11), (13), (11
c), (13c) ... Insulator (half-wave insulator, corrugated insulator), (12), (12a), (12b), (12c) ... Electrode (high-voltage electrode, corrugated high-voltage electrode), (14), (14a),
(14b), (14c) ... Electrodes (collecting electrodes, corrugated collecting electrodes). 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】電離箱形モニターチェンバーを有する放射
線出力モニターを備えている放射線治療装置において、
上記電離箱形モニターチェンバーの各電極には、表裏に
同形の多数の突出部がそれぞれ形成されており、かつ互
いに対向する電極の互いに対向する突出部は、互いに同
方向へ向けて同じ大きさに形成されていることを特徴と
する放射線治療装置。
1. A radiation therapy apparatus comprising a radiation output monitor having an ionization chamber type monitor chamber, comprising:
Each electrode of the ionization chamber monitor chamber has a plurality of protrusions of the same shape formed on the front and back sides, and the protrusions of the electrodes facing each other have the same size in the same direction. A radiotherapy device characterized by being formed.
JP1148328A 1989-06-13 1989-06-13 Radiotherapy equipment Expired - Lifetime JPH083986B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1148328A JPH083986B2 (en) 1989-06-13 1989-06-13 Radiotherapy equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1148328A JPH083986B2 (en) 1989-06-13 1989-06-13 Radiotherapy equipment

Publications (2)

Publication Number Publication Date
JPH0315483A JPH0315483A (en) 1991-01-23
JPH083986B2 true JPH083986B2 (en) 1996-01-17

Family

ID=15450321

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1148328A Expired - Lifetime JPH083986B2 (en) 1989-06-13 1989-06-13 Radiotherapy equipment

Country Status (1)

Country Link
JP (1) JPH083986B2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5826142B2 (en) * 1978-05-04 1983-06-01 日本原子力研究所 radiation ionization chamber
JPS6048662U (en) * 1983-09-09 1985-04-05 株式会社高岳製作所 radiation detection tube

Also Published As

Publication number Publication date
JPH0315483A (en) 1991-01-23

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