JPH0443997A - radiation shielding vacuum duct - Google Patents
radiation shielding vacuum ductInfo
- Publication number
- JPH0443997A JPH0443997A JP2149918A JP14991890A JPH0443997A JP H0443997 A JPH0443997 A JP H0443997A JP 2149918 A JP2149918 A JP 2149918A JP 14991890 A JP14991890 A JP 14991890A JP H0443997 A JPH0443997 A JP H0443997A
- Authority
- JP
- Japan
- Prior art keywords
- vacuum duct
- radiation
- radiation shielding
- ring
- duct
- 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.)
- Granted
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 63
- 238000010894 electron beam technology Methods 0.000 claims abstract description 13
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 9
- 239000010937 tungsten Substances 0.000 claims abstract description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 5
- 230000001133 acceleration Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
- Particle Accelerators (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、シンクロトロンやストレージリング等に用い
られ、略光速度にまで加速された電子ビームが通過する
放射線遮蔽真空ダクトに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radiation shielding vacuum duct used in synchrotrons, storage rings, etc., through which electron beams accelerated to approximately the speed of light pass.
［従来の技術］
リニアツクやシンクロトロン等の加速器によって略光速
度にまで加速された電子ビームは、ビームの寿命を長く
するために、内部が超高真空状！’Ｅｌ（約Ｉ Ｘ １
０−’Ｖｏｒｒ 〜Ｉ Ｘ １０−” ｙｏｒｒ程度）
に保たれた真空ダクト内を通過する。[Conventional technology] Electron beams accelerated to almost the speed of light by accelerators such as linear accelerators and synchrotrons are kept in an ultra-high vacuum inside to prolong the life of the beam! 'El (approximately I
0-'Vorr ~ I x 10-” yorr)
It passes through a vacuum duct maintained at
この際、真空ダクト内を通過する電子ビームが加速度を
受けると、人体に有害な放射線（Ｘ線等）が発生するこ
とが知られている６例えば、シンクロトロンやストレー
ジリングにおいて、円軌道を回る電子ビームは、中心に
向かう求心加速度を受け、上記放射線（Ｘ線等）が発生
する。At this time, when the electron beam passing through the vacuum duct is accelerated, it is known that radiation (X-rays, etc.) harmful to the human body is generated6. The electron beam receives centripetal acceleration toward the center, and the radiation (such as X-rays) is generated.
［発明が解決しようとする課題］
この放射線（Ｘｌ１等）は、ステンレスやアルミ等から
成形された上記真空ダクトを通過して、真空ダクト外部
に漏洩してしまう、よって、人体に有害である上記放射
線（Ｘ線等）を真空ダクト内に遮蔽する必要がある。こ
の対策として、本出願人は、先に第４図に示すように、
上記真空ダクトａの外側に、放射線遮蔽能力の大きなタ
ングステン板ｂ（板厚１〜２ ａｍ ）を真空ダクトａ
を覆うようにコ字状に曲げて、ダクトａを被覆するよう
に設けたものを開発した。[Problem to be solved by the invention] This radiation (Xl1, etc.) passes through the vacuum duct made of stainless steel, aluminum, etc. and leaks to the outside of the vacuum duct. It is necessary to shield radiation (such as X-rays) within the vacuum duct. As a countermeasure for this, the applicant has previously proposed, as shown in FIG.
A tungsten plate b (thickness 1 to 2 am) with a large radiation shielding ability is placed outside the vacuum duct a.
We have developed a device that is bent into a U-shape so as to cover the duct a.
しかしながら、タングステン板すは周知の如くその加工
性が極めて悪い、さらに、−旦、第４図に示、すように
コ字状に曲げても、図中破線で示すようなスプリングバ
ック現象が生じてしまう、従って、上記タングステン板
すを真空ダクトａを覆うようにコ字状に曲げることは、
その加工性の悪さから、製造コストの上昇を招く。However, as is well known, the workability of tungsten plates is extremely poor, and furthermore, even when bent into a U-shape as shown in Figure 4, a springback phenomenon occurs as shown by the broken line in the figure. Therefore, bending the tungsten plate into a U-shape to cover the vacuum duct a is
Its poor workability leads to an increase in manufacturing costs.
以上の事情を考慮して創案された本発明の目的は、安価
な製造コストで人体に有害な放射線を真空ダクト内に遮
蔽できる放射線遮蔽真空ダクトを提供するものである。An object of the present invention, which was created in consideration of the above circumstances, is to provide a radiation shielding vacuum duct capable of shielding the inside of the vacuum duct from radiation harmful to the human body at a low manufacturing cost.
［課題を解決するための手段］
上記目的を達成するために本発明に係る放射線遮蔽真空
ダクトは、路光速度の電子ビームが通過する真空ダクト
の外周に、タングステン等のヘビーメタルの粉末をリン
グ状に焼結した放射線遮蔽リングを、複数連結して装着
したことから構成されている。[Means for Solving the Problems] In order to achieve the above object, the radiation shielding vacuum duct according to the present invention includes a ring of heavy metal powder such as tungsten on the outer periphery of the vacuum duct through which the electron beam at the speed of light passes. It consists of a plurality of radiation shielding rings sintered into a shape and attached to each other.
［作 用コ
真空ダクト内の電子ビームから生じる放射線（Ｘ線等）
は、真空ダクトの外周に装着された放射線遮蔽リングに
よって、真空ダクト内に遮蔽される。よって、人体に有
害な上記放射線（Ｘ線等）が真空ダクト外部に漏洩する
ことが抑制される。[Operation: Radiation (X-rays, etc.) generated from the electron beam in the vacuum duct
is shielded within the vacuum duct by a radiation shielding ring attached to the outer circumference of the vacuum duct. Therefore, leakage of the radiation (such as X-rays) harmful to the human body to the outside of the vacuum duct is suppressed.
また、上記放射ＩＩＩ遮蔽リングは、放射線遮蔽能力の
大きなヘビーメタルの粉末を焼結して形成されているの
で、加工性の悪いヘビーメタル（例えばタングステン等
）にあっても容易に形成でき、低コストで製造できる。Furthermore, since the radiation III shielding ring described above is formed by sintering heavy metal powder with high radiation shielding ability, it can be easily formed even in heavy metals with poor workability (such as tungsten), and has a low cost. Can be manufactured at low cost.
また、この放射線遮蔽リングは、複数個連結されて装着
されていることから、個々のリングの大きさは小さくて
すみ、連結組付の際のハンドリングがよい。Furthermore, since a plurality of radiation shielding rings are connected and attached, the size of each individual ring can be small, and handling during connection and assembly is good.
［実施例］ 本発明の一実施例を添付図面に従って説明する。[Example] An embodiment of the present invention will be described with reference to the accompanying drawings.
第１図は、シンクロトロンやストレージリング等に用い
られる真空ダクト１を表し、このダクトｌ内に、リニア
ツク（図示せず）により路光速度にまで加速された電子
ビーム２が打込まれることになる。上記真空ダクト１は
、ステンレスまたはアルミから成形されており、図示す
るように、その外周には、長手方向に沿って、放射線遮
蔽能力の大きなタングステンの粉末をリング状に焼結成
形した放射線遮蔽リング３が装着されている。この放射
線遮蔽リング３は、真空ダクト１の長手方向に沿って所
定のリング輻３ａを有するように形成されており、第２
図に示すように、複数個連結されて、上記真空ダクト１
の外周を覆うように装着されている。Figure 1 shows a vacuum duct 1 used in synchrotrons, storage rings, etc., into which an electron beam 2 accelerated to the path light velocity by a linear actuator (not shown) is implanted. Become. The vacuum duct 1 is molded from stainless steel or aluminum, and as shown in the figure, a radiation shielding ring formed by sintering tungsten powder with a large radiation shielding ability into a ring shape along its outer periphery in the longitudinal direction. 3 is installed. This radiation shielding ring 3 is formed to have a predetermined ring radius 3a along the longitudinal direction of the vacuum duct 1, and has a second radiation shielding ring 3a.
As shown in the figure, a plurality of vacuum ducts 1 are connected to each other.
It is attached to cover the outer periphery of the
上記放射線遮蔽リング３は、放射線を遮蔽する際に発熱
するため、これを冷却すべく、その長手方向に沿って冷
却水通１！４が形成されている。また、放射線遮蔽リン
グ３の相互の連結部は、第３図に示すように、凹凸状に
形成されて相互に嵌め合され、連結部からの放射線の漏
洩を防止している。Since the radiation shielding ring 3 generates heat when shielding radiation, cooling water passages 1 and 4 are formed along its longitudinal direction in order to cool it. Further, as shown in FIG. 3, the mutually connecting portions of the radiation shielding rings 3 are formed in an uneven shape and are fitted together to prevent leakage of radiation from the connecting portions.
このように上記真空ダクト１の外周に複数個の放射線遮
蔽リング３を連結させて装着した後、第３図に示す如く
、その外部にＣｒ、Ｎｉ、Ｃｕ等の金属メツキ５を施す
ことにより、それぞれの放射線遮蔽リング３相互を固着
している。上記放射線遮蔽リング３は、強度部材ではな
いので、それほど大きな固着強度は必要なく、上記金属
メツキ５による固着で充分である。そして、そのさらに
外周に、第１図に示すように、ステンレスまたはアルミ
から成形された外管６が装着される。After a plurality of radiation shielding rings 3 are connected and attached to the outer periphery of the vacuum duct 1 in this way, as shown in FIG. 3, by applying metal plating 5 of Cr, Ni, Cu, etc. The respective radiation shielding rings 3 are fixed to each other. Since the radiation shielding ring 3 is not a strong member, it does not require a very large fixing strength, and fixing with the metal plating 5 is sufficient. As shown in FIG. 1, an outer tube 6 made of stainless steel or aluminum is attached to the outer periphery of the tube.
以上の構成からなる本実施例の作用について述べる。The operation of this embodiment having the above configuration will be described.
第１図に示す真空ダクト１内を通過する電子ビーム２は
、この真空ダクト１がシンクロトロンやストレージリン
グ等に用いられていることから、円軌道を回る際に中心
に向かう求心加速度を受け、放射線（Ｘ線等）を発生す
る。Since the vacuum duct 1 is used for synchrotrons, storage rings, etc., the electron beam 2 passing through the vacuum duct 1 shown in FIG. Generates radiation (X-rays, etc.).
この真空ダクト１内の電子ビーム２から生じる放射線（
Ｘ線等）は、真空ダクト１の外周に複数連結されて装着
された放射線遮蔽リング３によって真空ダクト１内に遮
蔽される。よって、人体に有害な上記放射線（Ｘ線等）
が真空ダクト１外部に漏洩することが抑制される。Radiation generated from the electron beam 2 in this vacuum duct 1 (
X-rays, etc.) are shielded within the vacuum duct 1 by a plurality of radiation shielding rings 3 connected and attached to the outer periphery of the vacuum duct 1. Therefore, the above radiation (X-rays, etc.) that is harmful to the human body
leakage to the outside of the vacuum duct 1 is suppressed.
従って、この真空ダクト１が用いられているシンクロト
ロンやストレージリング等が収容される建屋全体の放射
線遮蔽能力を落とすことができ、システム全体の放射線
遮蔽コストが低減する。Therefore, the radiation shielding ability of the entire building housing the synchrotron, storage ring, etc. in which this vacuum duct 1 is used can be reduced, and the radiation shielding cost of the entire system can be reduced.
放射線を遮蔽することによって発熱する放射線遮蔽リン
グ３は、リング３の長手方向に沿って形成された冷却水
通路４内の冷却水によって冷却される。The radiation shielding ring 3, which generates heat by shielding radiation, is cooled by cooling water in a cooling water passage 4 formed along the longitudinal direction of the ring 3.
また、上記放射線遮蔽リング３は、放射線遮蔽能力の大
きなタングステンの粉末を焼結して形成されているので
、加工性の悪いタングステンにあっても容易に形成する
ことができ、低コストで製造できる。また、この放射線
遮蔽リング３は、複数連結されて装着されていることか
ら、個々のリング３の大きさは小さくてすみ、連結組付
の際のハンドリングが良い。Furthermore, since the radiation shielding ring 3 is formed by sintering tungsten powder, which has a high radiation shielding ability, it can be easily formed even when using tungsten, which has poor workability, and can be manufactured at low cost. . Moreover, since a plurality of radiation shielding rings 3 are connected and attached, the size of each individual ring 3 can be small, and handling during connection and assembly is good.
また、放射線遮蔽リング３の連結部は、第３図に示すよ
うに、凹凸状に形成されて相互に嵌め合されているので
、この連結部から上記放射線が漏洩することはない、さ
らに、この放射線遮蔽リング３相互の凹凸状の連結部は
、連結組付の際の案内ガイドとなり、連結組付性を向上
させる。Furthermore, as shown in FIG. 3, the connecting portions of the radiation shielding ring 3 are formed in a concave and convex shape and are fitted together, so that the radiation does not leak from the connecting portions. The concavo-convex connecting portions between the radiation shielding rings 3 serve as guides when assembling the connections, thereby improving the ease of assembling the connections.
なお、上記実施例にあっては、放射線遮蔽リング３を焼
結形成するのに焼結材として、エネルギの高いＸ線を遮
蔽するのに最も適するタングステンの粉末を用いたが、
これに限らず放射線遮蔽効果のある鉛などのヘビーメタ
ルの粉末を用いてもよい、また、発生する放射線のエネ
ルギによっては、放射線遮蔽リング３がそれほど発熱し
ない場合もあり、この場合、連結されたの長手方向に沿
って形成された冷却水通路４を不要としてもよい。In the above embodiment, tungsten powder, which is most suitable for shielding high-energy X-rays, was used as the sintering material to sinter and form the radiation shielding ring 3.
Powder of heavy metal such as lead, which has a radiation shielding effect, may be used.Also, depending on the energy of the radiation generated, the radiation shielding ring 3 may not generate much heat, and in this case, the connected The cooling water passage 4 formed along the longitudinal direction may be unnecessary.
［発明の効果］
以上説明したように本発明によれば次のごとき優れた効
果が発揮できる。[Effects of the Invention] As explained above, according to the present invention, the following excellent effects can be exhibited.
真空ダクトの外周に、タングステン等のヘビーメタルの
粉末から焼結された放射線遮蔽リングを複数連結して装
着したことから、安価な製造コストで人体に有害なＸ線
等の放射線を真空ダクト内に遮蔽できる。Multiple radiation shielding rings made of sintered powder of heavy metals such as tungsten are connected and attached to the outer circumference of the vacuum duct, making it possible to keep radiation such as X-rays harmful to the human body out of the vacuum duct at low manufacturing costs. Can be shielded.
第１図は本発明の一実施例を示す放射線遮蔽真空ダクト
に装着される放射線遮蔽リングの装着状態を表す要部斜
視図、第２図は上記放射線遮蔽リングの連結状態を表す
要部斜視図、第３図は第２図の１１線断面図、第４図は
本出願人が先に開発した放射線遮蔽真空ダクトの断面図
である。
図中、１は真空ダクト、２は電子ビーム、３は放射線遮
蔽リングである。FIG. 1 is a perspective view of a main part showing a state in which a radiation shielding ring is attached to a radiation shielding vacuum duct according to an embodiment of the present invention, and FIG. 2 is a perspective view of a main part showing a state in which the radiation shielding ring is connected. , FIG. 3 is a sectional view taken along line 11 in FIG. 2, and FIG. 4 is a sectional view of a radiation shielding vacuum duct previously developed by the applicant. In the figure, 1 is a vacuum duct, 2 is an electron beam, and 3 is a radiation shielding ring.
Claims (1)
に、タングステン等のヘビーメタルの粉末をリング状に
焼結した放射線遮蔽リングを、複数連結して装着したこ
とを特徴とする放射線遮蔽真空ダクト。1. A radiation shielding vacuum characterized in that a plurality of radiation shielding rings made of sintered ring-shaped powder of heavy metal such as tungsten are connected and attached to the outer periphery of a vacuum duct through which an electron beam at approximately the speed of light passes. duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149918A JP2899717B2 (en) | 1990-06-11 | 1990-06-11 | Radiation shielding vacuum duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149918A JP2899717B2 (en) | 1990-06-11 | 1990-06-11 | Radiation shielding vacuum duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0443997A true JPH0443997A (en) | 1992-02-13 |
| JP2899717B2 JP2899717B2 (en) | 1999-06-02 |
Family
ID=15485434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2149918A Expired - Fee Related JP2899717B2 (en) | 1990-06-11 | 1990-06-11 | Radiation shielding vacuum duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2899717B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013024557A (en) * | 2011-07-14 | 2013-02-04 | Hamamatsu Photonics Kk | Electron beam irradiation device |
-
1990
- 1990-06-11 JP JP2149918A patent/JP2899717B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013024557A (en) * | 2011-07-14 | 2013-02-04 | Hamamatsu Photonics Kk | Electron beam irradiation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2899717B2 (en) | 1999-06-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |