JPS5824902B2 - radiation detector - Google Patents
radiation detectorInfo
- Publication number
- JPS5824902B2 JPS5824902B2 JP52006369A JP636977A JPS5824902B2 JP S5824902 B2 JPS5824902 B2 JP S5824902B2 JP 52006369 A JP52006369 A JP 52006369A JP 636977 A JP636977 A JP 636977A JP S5824902 B2 JPS5824902 B2 JP S5824902B2
- Authority
- JP
- Japan
- Prior art keywords
- high voltage
- radiation detector
- radiation
- detector
- signal electrode
- 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
Links
- 230000005855 radiation Effects 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles
- H01J47/02—Ionisation chambers
Landscapes
- Measurement Of Radiation (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Electron Tubes For Measurement (AREA)
Description
【発明の詳細な説明】
本発明は放射線検出器に係り、特にコリメートされた放
射線（Ｘ線やｒ線）を検査すべき被検体（例えは人体）
にあらゆる方向から曝射し、その透過放射線を検出器で
検知し、被検体での放射線の吸収率を測定し、これをコ
ンピュータで適当な処理を施すことにより放射線の透過
方向の断層像を再構成するＣＴスキャナ（Ｃａｍｐｕｔ
ｅａＴｏｍｇｒａｐｈｙ ５ｃａｎｎｅｒ ）に適した
放射線検出器に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiation detector, and particularly to a subject (for example, a human body) to be examined using collimated radiation (X-rays or R-rays).
is irradiated from all directions, the transmitted radiation is detected by a detector, the absorption rate of the radiation in the subject is measured, and a tomographic image in the direction of radiation transmission is reconstructed by appropriately processing this in a computer. CT scanner (Camput)
The present invention relates to a radiation detector suitable for the eaTomgraphy 5canner).
前記のような放射線検出器は例えば第１図に示すように
信号電極１を形成する金属細線２を絶縁基板３に設けた
支持体４によって絶縁基板３の欠除部に支持してなる信
号電極板５と、高電圧電極６を形成するニッケルや真鍮
で成る高電圧電極板６ａとを順次平行に並べて例えばキ
セノンガス中に封入してなり、信号電極１が高圧電極６
に挾まれた構成を示す検出素子の複数を有して成ってい
た。The radiation detector described above has a signal electrode formed by supporting a thin metal wire 2 forming a signal electrode 1 in a cutout part of an insulating substrate 3 by a support 4 provided on the insulating substrate 3, as shown in FIG. 1, for example. The plate 5 and a high voltage electrode plate 6a made of nickel or brass forming the high voltage electrode 6 are sequentially arranged in parallel and sealed in, for example, xenon gas, so that the signal electrode 1 is connected to the high voltage electrode 6.
It consisted of a plurality of detection elements exhibiting a sandwiched configuration.
第２図に示すようにこのような検出器に入射した放射線
７は封入ガス８にエネルギを与えてこれを電離して信号
電流を発生すると共に螢光Ｘ線９を発生する。As shown in FIG. 2, the radiation 7 incident on such a detector imparts energy to the filler gas 8 and ionizes it to generate a signal current and fluorescent X-rays 9.
この螢光Ｘ線９は、全方向に散乱して互に近接した検出
素子間でクロストーク或いは相互干渉をおこす。The fluorescent X-rays 9 are scattered in all directions, causing crosstalk or mutual interference between detection elements that are close to each other.
本発明はこのようなりロストークの軽減された放射線検
出器を提供することを目的とするものである。An object of the present invention is to provide a radiation detector with reduced losstalk.
以下にその詳細を説明する。The details will be explained below.
本発明は上記目的を達成するために高電圧電極板６ａの
材質を従来のニッケルや真鍮に代えて重金属としたもの
である。In order to achieve the above object, the present invention uses a heavy metal as the material of the high voltage electrode plate 6a instead of conventional nickel or brass.
重金属は卯工上の問題からＷ、ＭＯが好ましＧ）。For heavy metals, W and MO are preferable due to mechanical problems (G).
封入ガスがキセノンの場合、入射Ｘ線のエネルギーが７
０ Ｋ ｅ Ｖとすれば、光電効果により７０−３４．
６＝３５．４ＫｅＶのエネルギーを有する電子かに殻よ
り射出せられ、この電子が次々にＸｅガスを電離し、信
号電流となる。When the filled gas is xenon, the energy of the incident X-ray is 7
If it is 0 K e V, then it will be 70-34. due to the photoelectric effect.
Electrons having an energy of 6=35.4 KeV are ejected from the crab shell, and these electrons successively ionize the Xe gas, resulting in a signal current.
ここで３４．６ＫｅＶはＸｅガスのに殻電子の結合エネ
ルギーである。Here, 34.6 KeV is the binding energy of shell electrons of Xe gas.
いま光電効果によって出来たに殻の空位にＬ殻電子が遷
移するが、この時に殻電子とＬ殻電子の結合エネルギー
の差である２９ＫｅＶの螢光Ｘ線があらゆる方向に発生
する。Now, the L-shell electrons are transferred to the vacancies in the shell created by the photoelectric effect, and at this time, fluorescent X-rays of 29 KeV, which is the difference in binding energy between the shell electrons and the L-shell electrons, are generated in all directions.
この螢光Ｘ線の飛程はＸｅガス中で約２ｃｍであるので
、検出素子間でクロストークの原因となる。Since the range of this fluorescent X-ray is about 2 cm in Xe gas, it causes crosstalk between detection elements.
いま高圧電極６ａに遮蔽効果を考えてみると、実用の強
度上高圧電極６ａは０．１ｍｍ程度頃上の厚さが必要で
あり、感度の低下を来たさない為に０．５ｍ以下が好ま
しい。Now, considering the shielding effect of the high voltage electrode 6a, the high voltage electrode 6a needs to have a thickness of about 0.1 mm or more for practical strength, and 0.5 m or less is required to avoid a decrease in sensitivity. preferable.
例えば遮蔽効果はモリブデン板とニッケル板について０
．１ ｍｍ厚さのものについての比較に於て従来のもの
より３桁よくなる結果が得られている。For example, the shielding effect is 0 for molybdenum plates and nickel plates.
．． In comparison with a 1 mm thick product, results were obtained that were three orders of magnitude better than the conventional product.
本発明は以上のようになるものであって、ＣＴ用多チャ
ンネル検出器のＳ／Ｎを向上し、これを用いたＣＴスキ
ャナの再構成断層像の画質の向上を行ない得る効果の犬
なるものである。The present invention is as described above, and has the effect of improving the S/N of a multi-channel CT detector and improving the image quality of reconstructed tomographic images of a CT scanner using the same. It is.
第１図はＣＴスキャナ用多チャンネル検出器の１部の検
出素子の構成を示す斜視図、第２図は検出素子の断面図
である。
２：金属細線、１：信号電極、６：高圧電極。FIG. 1 is a perspective view showing the configuration of a part of a detection element of a multi-channel detector for a CT scanner, and FIG. 2 is a sectional view of the detection element. 2: Fine metal wire, 1: Signal electrode, 6: High voltage electrode.
Claims (1)
向する高圧電極とを順次はぼ平行に並べて形成されて信
号電極が高圧電極に挾まれた構成を示す検出素子の複数
でなる検出器に於て前記高圧電極が重金属で形成されて
いることを特徴とする放射線検出器。1. A detector consisting of a plurality of detection elements in which a signal electrode formed of a thin metal wire and a high voltage electrode facing the signal electrode are sequentially arranged substantially parallel to each other, and the signal electrode is sandwiched between the high voltage electrodes. A radiation detector characterized in that the high voltage electrode is made of heavy metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52006369A JPS5824902B2 (en) | 1977-01-25 | 1977-01-25 | radiation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52006369A JPS5824902B2 (en) | 1977-01-25 | 1977-01-25 | radiation detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5392182A JPS5392182A (en) | 1978-08-12 |
| JPS5824902B2 true JPS5824902B2 (en) | 1983-05-24 |
Family
ID=11636443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52006369A Expired JPS5824902B2 (en) | 1977-01-25 | 1977-01-25 | radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5824902B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI63495C (en) * | 1979-02-07 | 1983-06-10 | Hospital Physics Oy | STRAOLNINGSDETEKTOR |
-
1977
- 1977-01-25 JP JP52006369A patent/JPS5824902B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5392182A (en) | 1978-08-12 |
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