JPS6089054A - Radiation detector - Google Patents
Radiation detectorInfo
- Publication number
- JPS6089054A JPS6089054A JP58196045A JP19604583A JPS6089054A JP S6089054 A JPS6089054 A JP S6089054A JP 58196045 A JP58196045 A JP 58196045A JP 19604583 A JP19604583 A JP 19604583A JP S6089054 A JPS6089054 A JP S6089054A
- Authority
- JP
- Japan
- Prior art keywords
- entrance window
- window
- radiation detector
- resin
- carbon fibers
- 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 26
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 17
- 239000004917 carbon fiber Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 description 13
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 229910052724 xenon Inorganic materials 0.000 description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 210000004884 grey matter Anatomy 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 210000004885 white matter Anatomy 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 210000001519 tissue Anatomy 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
- H01J47/001—Details
- H01J47/002—Vessels or containers
- H01J47/004—Windows permeable to X-rays, gamma-rays, or particles
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、放射線断層撮影装置に使用される放射線検出
器に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiation detector used in a radiation tomography apparatus.
放射線断層撮影装置の一つとしてコンピュータ・トモグ
ラフィ装置（ＣＴ装置）かある。この装置は第１図に示
すように例えば偏平な扇状のファンビームＸ１ＦＸをパ
ルス的に曝射するＸ＃ｉｌ源１と、このＸ線を検出する
複数の放射線検出系子りを並設してなる放射線検出器２
とを被検体６を挾んで対峙させ、かつこれらＸ線源１及
び放射線検出器２を前記被検体６を中心に互いに同方向
に同一角速度で回転移動させ、被検体６断面の種々の方
向に対するＸ＃Ｊ吸収データを収集する。そして充分な
データを収集した後、このデータを電子計算機で解析し
、被検体断面の個々の位置に対するＸ＃ｉ！吸収率な算
出して、その吸収率に応じた階調度で前記被検体断面を
再構成するようにしたもので、組成に応じて２０００段
階にも及ぶ階副度で分析できるので、軟質組織から硬質
組織に至るまで明確な断層像が得られる。A computer tomography device (CT device) is one type of radiation tomography device. As shown in Fig. 1, this device includes an X#il source 1 that emits, for example, a flat, fan-shaped fan beam X1FX in a pulsed manner, and a plurality of radiation detection systems that detect this X-ray. radiation detector 2
The Collect X#J absorption data. After collecting sufficient data, this data is analyzed by an electronic computer, and the X#i! This method calculates the absorption rate and reconstructs the cross section of the subject with a gradation level corresponding to the absorption rate.It can perform analysis in as many as 2000 gradation levels depending on the composition, so it is possible to analyze from soft tissue to Clear tomographic images can be obtained down to hard tissue.
ここで、前記放射線検出器２は、例えばそれぞれ電離箱
を構成する多数の放射線検出系子からなりＸｅ（キセノ
ン）等の高圧ガスが封入された放射線検出器として構成
され、被検体３の断面を透過したＸ線のエネルギーを電
離電流として検出し、これをＸＳａ収データとして出力
する。Here, the radiation detector 2 is configured as a radiation detector that includes a large number of radiation detection systems each forming an ionization chamber, and is filled with a high-pressure gas such as Xe (xenon), and detects a cross section of the subject 3. The energy of the transmitted X-rays is detected as ionization current, and this is output as XSa collection data.
すなわち、このｘＩＲ吸収データの収集にあたりては、
電離箱を構成する各放射線検出素子とＸ線源とを結ぶ線
上（これをＸ線バスという）を透過してきたＸ線のエネ
ルギーを電離電流として検出してこれな所定の時間積分
し、その積分値を所定の時定数の放電回路にて放電して
その放電時間値を各Ｘ線パスについてのＸ線吸収データ
とするものである。In other words, when collecting this xIR absorption data,
The energy of the X-rays that have passed through the line connecting each radiation detection element that makes up the ionization chamber and the X-ray source (this is called the X-ray bus) is detected as an ionization current, integrated over a predetermined time, and The value is discharged in a discharge circuit having a predetermined time constant, and the discharge time value is used as the X-ray absorption data for each X-ray pass.
ところで、最終的な再構成画像の良否は放射線検出器の
もつ、感度、分解能（空間分解能、密度分Ｍ能）で定ま
るため、優れたＣＴ装置を得るためには、高感度、高分
解能の放射線検出器を使用しなければなら゛ない。この
うち感度はＰＬ値（ガス圧Ｘ検出素子央行長： ａｔｍ
＊ ｃｍ ）で規定されるものであり、一般には６０
ａｔｍ＊ｃｍ程度であり、その時のエネルギー吸収効率
は４０〜６０％である。又、空間分解能は電極素子の配
列ピンチにより規定されるものであり、０．５ ｚｔｎ
〜０．６關径の物質が見えれば優秀といえる。By the way, the quality of the final reconstructed image is determined by the sensitivity and resolution (spatial resolution, density resolution M capability) of the radiation detector, so in order to obtain an excellent CT device, it is necessary to use radiation with high sensitivity and high resolution. A detector must be used. Among these, the sensitivity is the PL value (gas pressure
*cm), generally 60
It is about atm*cm, and the energy absorption efficiency at that time is 40 to 60%. In addition, the spatial resolution is defined by the arrangement pinch of the electrode elements, and is 0.5 ztn
If you can see a substance with a diameter of ~0.6, it can be said to be excellent.
密度分解能とは、臨床においていかに密度差の小さい物
質が識別できるかの能力である。この能力は放射線検出
器の入射窓を透過して検出素子に到達する低エネルギー
フォトンに比例する。伺故ならば、白質と灰白質との線
吸収係数（ｃｍ）差は低エネルギーにおいて有意差な有
するからである。Density resolution is the ability to identify substances with small density differences in clinical practice. This ability is proportional to the low energy photons that pass through the radiation detector's entrance window and reach the detection element. This is because the difference in linear absorption coefficient (cm) between white matter and gray matter is significant at low energies.
しかしながら、放射線検出器２は第２図及び第３図に示
すように、円弧状箱形をなし、この箱形の本体４はファ
ンビームＸ線ＦＸの広がり角θに対応して、その入射面
側壁に入射窓４ａを有しているため、低エネルギーフォ
トンは検出素子に到達する前に前記入射窓に吸収されて
しまう。通常、前記箱形の本体４は入射窓４ａなも含め
て、Ｘ線透過率が良好なアルミニウムで被覆され、然も
入射窓４ａは他の部分よりも肉薄になっているが、低エ
ネルギーフォトンの入射窓での吸収が避けられなかった
。従って、高密度分解能を得るためには、Ｘ線入射窓が
ないことが理想的であるが、前記箱形の本体４の内部に
例えばＸｅ（キセノン）ガス等の高圧ガスを充填する必
要上、Ｘ線入射窓の存在は必要なものであった。However, as shown in FIGS. 2 and 3, the radiation detector 2 has an arcuate box shape, and the box-shaped body 4 has an incident surface corresponding to the spread angle θ of the fan beam X-rays FX. Since the side wall has the entrance window 4a, low energy photons are absorbed by the entrance window before reaching the detection element. Normally, the box-shaped main body 4, including the entrance window 4a, is coated with aluminum, which has good X-ray transmittance, and although the entrance window 4a is thinner than other parts, low energy photons Absorption at the entrance window was unavoidable. Therefore, in order to obtain high-density resolution, it is ideal to have no X-ray entrance window, but since it is necessary to fill the inside of the box-shaped main body 4 with high-pressure gas such as Xe (xenon) gas, The presence of an X-ray entrance window was necessary.
また、箱形の本体４内部にキセノンガス等の高圧ガスが
充填されているため、Ｘ線入射窓４ａにはその内部から
の応力がかかり、そのかかる応力も入射窓４ａのスライ
ス方向たる０°方回（第４図参照）と入射窓４ａのチャ
ンネル方向たる９０°方向（第４図参照）とでは、第５
図に示すように、０°方向１０にかかる応力の方が９０
０万回１１にかかるそれよりもほぼ２倍の応力がかかる
。従って、この破竹する内部からの応力に対して適切に
対処するためには、入射窓部材自体の強度を９０°方回
よりも０°方回に２倍の強さを有することが理想的であ
る。In addition, since the inside of the box-shaped main body 4 is filled with high-pressure gas such as xenon gas, stress is applied from inside the X-ray entrance window 4a, and the applied stress is also 0°, which is the slice direction of the entrance window 4a. (see Fig. 4) and the 90° direction which is the channel direction of the entrance window 4a (see Fig. 4).
As shown in the figure, the stress applied in the 0° direction 10 is 90°
The stress is almost twice as much as that applied to 110,000 cycles. Therefore, in order to appropriately deal with this stress from within, it is ideal for the entrance window member itself to have twice the strength in the 0° direction than in the 90° direction. be.
本発明は前記事情に基づいてなされたものであり、高密
度分解能を得ることができると共に、内部から入射窓に
発生する応力に対して強に的に安全な強度を有する放射
線検出器を提供することを目的とする。The present invention has been made based on the above-mentioned circumstances, and provides a radiation detector that can obtain high-density resolution and has a strong strength that is extremely safe against stress generated in the entrance window from inside. The purpose is to
上記目的を達成するための本発明のａ要は、高圧ガスを
封入した放射線検出器において、一方向に配向した炭素
繊維に樹脂を含浸してなる複数の樹脂含浸板な、炭素繊
維の配回方向がスライス方向とチャンネル方向とが相互
に直交するように積層し、スライス方向での強度とチャ
ンネル方向での強度とをほぼ等しくしてなる入射窓部材
を備えたことを特徴とするものである。The key point of the present invention to achieve the above object is that, in a radiation detector filled with high-pressure gas, carbon fibers are arranged in a plurality of resin-impregnated plates made by impregnating carbon fibers oriented in one direction with resin. It is characterized by comprising an entrance window member which is laminated so that the slice direction and the channel direction are orthogonal to each other, and whose intensity in the slice direction and the intensity in the channel direction are approximately equal. .
以下本発明の実施例を図面を参照しながら具体的に説明
する。Embodiments of the present invention will be specifically described below with reference to the drawings.
第６図は本発明における放射線検出器の一実施例を示す
断面図である。同図において、１６はファンビームＸ＠
ＦＸの当たる入射面側壁をくり抜いた窓部１３ａを有す
るケース本体であり、アルミニウムにより成形されてい
る。１４はこのケース本体１３の上部開口部を閉塞して
いる蓋である。FIG. 6 is a sectional view showing an embodiment of the radiation detector according to the present invention. In the same figure, 16 is a fan beam
The case body has a window portion 13a cut out from the side wall of the incident surface where the FX hits, and is molded from aluminum. Reference numeral 14 denotes a lid that closes the upper opening of the case body 13.
１５は炭素繊維強化樹脂（以下、ＣＦＲＰという）から
なる入射窓であり、この入射窓１５はケース本体１６の
内側面に前記窓部１３ａを閉塞するように固定されてい
る。１６はケース本体１３０内側面に固定された入射窓
１５を補強するための補強部材で、前記窓部１３ａに対
応する箇所に穴部１６ａを有する額縁形状をなしている
（第７図参照）。この補強部材１６を用いて入射窓１５
を補強するには、まず、入射窓１５をシート状の接着剤
を用いてケース本体１６に貼着した後、第５図に示すよ
うに入射窓１５を補強部材１６のそれぞれの胸囲の対応
箇所に設けたネジ孔にネジ１７を差し込みネジ止するこ
とによって、ケース本体１６に貼着された入射窓１５を
強固に補強するものである。尚、ここで使用されている
入射窓１５及び補強部材１６は、いずれも検出器の円弧
形状に合致するように曲率な有している（第７図参照）
。Reference numeral 15 denotes an entrance window made of carbon fiber reinforced resin (hereinafter referred to as CFRP), and this entrance window 15 is fixed to the inner surface of the case body 16 so as to close the window 13a. Reference numeral 16 denotes a reinforcing member for reinforcing the entrance window 15 fixed to the inner surface of the case body 130, and has a frame shape with a hole 16a at a location corresponding to the window 13a (see FIG. 7). By using this reinforcing member 16, the entrance window 15
To reinforce the entrance window 15, first attach the entrance window 15 to the case body 16 using a sheet of adhesive, and then attach the entrance window 15 to the corresponding part of the chest circumference of the reinforcing member 16 as shown in FIG. The entrance window 15 attached to the case body 16 is strongly reinforced by inserting and screwing the screw 17 into the screw hole provided in the case body 16. Incidentally, the entrance window 15 and the reinforcing member 16 used here both have a curvature that matches the arc shape of the detector (see Fig. 7).
.
ところで、前記入射窓１５を構成するＣＦＲＰは、第８
図に示すように、一方向に配回した炭素繊維に樹脂な含
浸してなる複数枚のプリプレグ（樹脂浸透加工材）１５
八〜１５Ｌを重ね合わせて一体化したものである。そし
て、この重合されるプリプレグの何枚かは炭素繊維方向
を変えている。すなわち、第９図に示すように、まず炭
素繊維方向が０°方向（以下、０°方回と略称する）の
プリプレグ１５Ａと１５Ｂが重合され、次に炭素繊維方
向が９０°方向（以下、９０’方回と略称する）のプリ
プレグ１５Ｃが重合され、次いで０°方向のプリプレグ
１５Ｄと１５Ｂ、９０°方向のプリプレグ１５Ｆと１５
Ｇ、０°方向のプリプレグ１５Ｈと１５Ｉ＆順次に重合
し、さらに９０°方向のプリプレグ１５Ｊを重ね合せ、
最後には０°方回のプリプレグ１５にと１５Ｌを重ねて
、これらを一体化して入射窓１５０部材たるＣＦＲＰが
構成されている。換言すれば、入射窓１５は０°方向の
プリプレグか８枚と９０°方回のプリプレグが４枚とで
構成されている。従って、プリプレグの強度は炭素繊維
方向の方が強いため、上記のように０６方回と９０°方
向のプリプレグの枚数割合を２：１にすれば、これな重
合してなる入射窓１５０強度も０°方回の万が９０°方
回よりも２倍の強さを有することになる。このことは検
出器の入射窓に発生する応力に対して理想的な強度を有
することになり、強度的に安全なＣＦＲＰよりなる入射
窓となる。By the way, the CFRP constituting the entrance window 15 is
As shown in the figure, multiple sheets of prepreg (resin-impregnated material) 15 are made by impregnating carbon fibers arranged in one direction with resin.
It is made by overlapping and integrating 8 to 15L. The direction of the carbon fibers in some of the prepregs to be polymerized is changed. That is, as shown in FIG. 9, first prepregs 15A and 15B with the carbon fiber direction in the 0° direction (hereinafter referred to as 0° direction) are polymerized, and then the carbon fiber direction is in the 90° direction (hereinafter referred to as 0° direction). Prepreg 15C in the 90' direction is polymerized, followed by prepregs 15D and 15B in the 0° direction, and prepregs 15F and 15 in the 90° direction.
G, prepregs 15H and 15I in the 0° direction are polymerized sequentially, and then prepreg 15J in the 90° direction is superimposed,
Finally, the prepregs 15 and 15L are stacked on top of the prepreg 15 in the 0° direction, and these are integrated to form the CFRP that is the member of the entrance window 150. In other words, the entrance window 15 is made up of eight 0° prepreg sheets and four 90° prepreg sheets. Therefore, the strength of the prepreg is stronger in the carbon fiber direction, so if the ratio of the number of prepreg sheets in the 06 direction and the 90 degree direction is set to 2:1 as described above, the strength of the entrance window 150 formed by polymerization can also be increased. A 0° rotation is twice as strong as a 90° rotation. This means that the entrance window of the detector has ideal strength against the stress generated in the entrance window, resulting in an entrance window made of CFRP that is safe in terms of strength.
ここで、ＣＦＲＰはアクリル繊維、レーヨン繊維等を高
温（２００〜３００℃）で炭炎化し、更に昇温（７００
〜１８００℃）して炭化させた炭素繊維をレジン（エポ
キシ樹脂等）で含浸したもので、その体積含有率は繊維
６０％、レジ７４０係が一般的である。そして、このＣ
ＦＲＰの特性としては、■Ｘ線透過率がアルミニウム当
量で’１０（６０ＫＶ〜１０ＱＫＶ）■引張強度が〜１
２ＯＫ、９／關２（繊維方向）■弾性率が約１２０００
Ｋ、！ｉ’ ／ｍｕ”が上げられる。これは、従来の
入射窓の材質として使用されていたアルミニウムと比較
すると、透過率及び強度において数段も優れている。従
って、このＣＦＲＰを前記実施例の如く入射窓の材質と
して使用すれば、入射窓のＸ、ｌ透過率が増すため、検
出素子自身に到達するＸ線が増大し、Ｓ／Ｎが同上する
ことは勿論、Ｘ＃３！の低エネルギー側の入射窓での吸
収が少なくなるため、吸収係数差の倣小な白質や灰白質
の識別が可能になり、密度分解度の同上を図ることがで
きる。第１２図は、この密度分解度の向上を示すために
、シミュレーション結果においてＸ線入射窓をアルミニ
ウムからＣＦＲＰにしたことによる検出素子でのＸ線吸
収スペクトルの変化を示したグラフである。同図におい
て、６１はＸ線入射窓をアルミニウムにした場合の検出
素子でのＸ線吸収スペクトルであり、３２はＸ線入射窓
をＣＦＲ，Ｐにした場合の検出素子でのＸ線吸収スペク
トルである。この結果、検出系子での低エネルギー側の
吸収はＣＦＲＰを用いた場合の方が１５〜２０％も向上
していることがわかる。但し、この結果は入射窓の厚さ
をアルミニウムとＣＦＲＰを共に同厚にした場合である
。向、図中において６０は入射窓の前面（入射窓を透過
するが■）でのＸＭＡスペクトルを表わす。Here, CFRP is made by carbonizing acrylic fibers, rayon fibers, etc. at high temperatures (200 to 300°C), and then further increasing the temperature (700°C).
It is made by impregnating carbon fibers that have been carbonized at temperatures up to 1,800°C with a resin (epoxy resin, etc.), and the volume content of the fibers is generally 60% and the register size is 740%. And this C
The characteristics of FRP are: ■ X-ray transmittance is '10 in aluminum equivalent (60KV ~ 10QKV) ■ Tensile strength is ~1
2 OK, 9/2 (fiber direction) ■Modulus of elasticity is approximately 12,000
K! i'/mu". This is much superior in transmittance and strength to aluminum, which has been used as a material for conventional entrance windows. If used as the material for the entrance window, the X and l transmittance of the entrance window increases, which increases the number of X-rays that reach the detection element itself, which not only increases the S/N ratio but also reduces the energy of X#3! Since the absorption at the side entrance window is reduced, it becomes possible to identify white matter and gray matter with small absorption coefficient differences, and it is possible to achieve the same density resolution.Figure 12 shows this density resolution. In order to show the improvement, this is a graph showing the change in the X-ray absorption spectrum in the detection element due to changing the X-ray entrance window from aluminum to CFRP in the simulation results. This is the X-ray absorption spectrum at the detection element when aluminum is used, and 32 is the X-ray absorption spectrum at the detection element when the X-ray incidence window is CFR, P. As a result, the It can be seen that absorption on the energy side is improved by 15 to 20% when CFRP is used.However, this result is obtained when the thickness of the entrance window is the same for both aluminum and CFRP. In the figure, 60 represents the XMA spectrum in front of the entrance window (although it is transmitted through the entrance window, ▪).
本発明は前記実施例に限定されず、本発明の要旨の範囲
内で変更して実施することができる。例えば、第１０図
及び第１１図に示すように、ＣＦ’ＲＰよりなる入射窓
１５の周囲を直接にネジ止により補強するのではなく、
入射窓１５０周縁な額緯状の補強部材２６により当接す
ることによってケース本体１３に入射窓１５を補強する
形態をとっている。すなわち、ＣＦＲＰよりなる入射窓
１５を介在して、補強部材２６とケース本体１６をネジ
２７により直接にネジ止する構造となっている。補強部
材２６の外側（入射窓を介在する側と反対側）の下端２
６ｂはテーパ状になっており、この下端２６ｂはケース
本体１６の内部底面に形成されている同様のテーパ状の
溝１３ｂに埋め込まれた状態でネジ止されている。ガス
が封入されて内圧がかかると、補強部材の下端２６ａに
は入射窓の窓厚方向に力が発生する。いわゆるセルフシ
ールの構造となっている。尚、Ｃ１ｉ’ＲＰの入射窓１
５を補強部材２６で補強する際には、前述の実施例と同
様に予め入射窓１５をシート状接着剤でケース本体１６
に貼着しておくものとする。第１０図及び第１１図で示
した実施例によると、ＣＦＲＰよりなる入射窓１５にネ
ジ孔をあける必要がないため、その孔の周囲に応力集中
が発生することがないので、強度的にはより安定した構
造になっている。The present invention is not limited to the embodiments described above, and can be implemented with modifications within the scope of the gist of the present invention. For example, as shown in FIGS. 10 and 11, instead of directly reinforcing the periphery of the entrance window 15 made of CF'RP with screws,
The entrance window 15 is reinforced in the case body 13 by abutting against the reinforcing member 26 in the shape of a frame at the periphery of the entrance window 150. That is, the structure is such that the reinforcing member 26 and the case body 16 are directly screwed together with the screws 27 with the entrance window 15 made of CFRP interposed therebetween. Lower end 2 of the outer side of the reinforcing member 26 (the side opposite to the side with the entrance window interposed)
6b has a tapered shape, and the lower end 26b is embedded in a similar tapered groove 13b formed on the inner bottom surface of the case body 16 and is screwed. When gas is sealed and internal pressure is applied, a force is generated at the lower end 26a of the reinforcing member in the window thickness direction of the entrance window. It has a so-called self-sealing structure. Incidentally, the entrance window 1 of C1i'RP
5 with the reinforcing member 26, the entrance window 15 is attached to the case body 16 with a sheet adhesive in advance, as in the previous embodiment.
shall be affixed to. According to the embodiment shown in FIGS. 10 and 11, there is no need to drill a screw hole in the entrance window 15 made of CFRP, so stress concentration does not occur around the hole, so the strength is reduced. It has a more stable structure.
また、前記実施例に示したようなプリプレグの配列状態
（第９図参照）に必ずしもする必要はなく、プリプレグ
の繊維方向が０８方向に向いたものと９０°方向へ向い
たものとの枚数割合を２＝１の比率になるようにプリプ
レグを重合すれば足りる。In addition, it is not necessary to arrange the prepregs as shown in the above example (see Figure 9), and the ratio of the number of prepregs in which the fiber direction is oriented in the 08 direction and that in which the fiber direction is oriented in the 90° direction is not necessarily required. It is sufficient to polymerize the prepreg so that the ratio of 2=1.
本発明は以上説明したように、検出器の入射窓を複数枚
のプリプレグを重合してなる炭素繊維強化樹脂により構
成し、然もプリプレグの配列に工夫な凝らすことにより
、高密度分解能の向上に寄与できると共に、検出器の入
射窓に発生する応力に対して強度的に安全な強度を有す
る放射線検出器を提供することができる。As explained above, the present invention improves high-density resolution by constructing the entrance window of the detector from carbon fiber-reinforced resin made by polymerizing multiple sheets of prepreg, and by carefully arranging the prepregs. Therefore, it is possible to provide a radiation detector having a strength that is strong and safe against stress occurring in the entrance window of the detector.
第１図はＣＴ装置の概要を示す説明図、第２図は従来の
放射線検出器の一例を示す斜視図、第３図はその断面図
、第４図は検出器の入射窓に発生する応力な示すための
説明図、第５図は検出器の容器内の内圧と入射窓に発生
する応力との関係図、第６図は本発明に係る放射線検出
器の一実施例を示す断面図、第７図は前記実施例に使用
する入射窓と補強部材を示す斜視図、第８図は本発明の
狭部である入射窓の構成を示す概略斜視図であり、第９
図はその詳細を示すための説明図、第１０図は本発明の
他の実施例を示す断面図、第１１図はその実施例で使用
する入射窓と補強部材を示す斜視図、第１２図は本発明
における放射線検出器によるシミュレーション結果を示
すグラフである。
１５・・・入射窓（入射窓部材）、 １５Ａ〜１５Ｌ・
・・プリプレグ（樹脂含浸板）。
代理人 弁理士 則 近 憲 佑（ほか１名）（ｌ萄
第４図
竺 只 Ｍ
内ｈ （Ｋｓ／ｃ、ｌ）
未 υ し＼
第７図
特開昭ＧＯ−８９０５４（６）Fig. 1 is an explanatory diagram showing an overview of a CT device, Fig. 2 is a perspective view showing an example of a conventional radiation detector, Fig. 3 is a sectional view thereof, and Fig. 4 is a stress generated in the entrance window of the detector. FIG. 5 is a diagram showing the relationship between the internal pressure in the container of the detector and the stress generated in the entrance window. FIG. 6 is a sectional view showing an embodiment of the radiation detector according to the present invention. FIG. 7 is a perspective view showing the entrance window and reinforcing member used in the embodiment, FIG. 8 is a schematic perspective view showing the structure of the entrance window which is the narrow part of the present invention, and FIG.
The figures are explanatory diagrams showing the details, FIG. 10 is a sectional view showing another embodiment of the present invention, FIG. 11 is a perspective view showing the entrance window and reinforcing member used in that embodiment, and FIG. 12 is a graph showing simulation results using a radiation detector according to the present invention. 15... Entrance window (incidence window member), 15A to 15L.
...Prepreg (resin-impregnated board). Agent Patent attorney Kensuke Chika (and 1 other person)
Claims (1)
回した炭素繊維に樹脂を含浸してなる複数の樹脂含浸板
を、炭素繊維の配向方向がスライス方向とチャンネル方
向とが相互に直交するように積層し、スライス方向での
強度とチャンネル方向での強度とをほぼ等しくしてなる
入射窓部材を備えたことを特徴とする放射線検出器。In a radiation detector filled with high-pressure gas, a plurality of resin-impregnated plates made by impregnating carbon fibers arranged in one direction with resin are arranged so that the orientation direction of the carbon fibers is perpendicular to the slice direction and the channel direction. What is claimed is: 1. A radiation detector comprising: an entrance window member which is laminated to have substantially equal intensity in the slice direction and in the channel direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58196045A JPS6089054A (en) | 1983-10-21 | 1983-10-21 | Radiation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58196045A JPS6089054A (en) | 1983-10-21 | 1983-10-21 | Radiation detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6089054A true JPS6089054A (en) | 1985-05-18 |
| JPH0259582B2 JPH0259582B2 (en) | 1990-12-12 |
Family
ID=16351272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58196045A Granted JPS6089054A (en) | 1983-10-21 | 1983-10-21 | Radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6089054A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013049784A1 (en) * | 2011-09-30 | 2013-04-04 | Composite Mirror Applications, Inc. | Solar collector having a substrate with multiple composite plies |
| EP2525383A3 (en) * | 2011-05-16 | 2014-01-01 | Brigham Young University | Carbon composite support structure |
| US9076628B2 (en) | 2011-05-16 | 2015-07-07 | Brigham Young University | Variable radius taper x-ray window support structure |
| US9502206B2 (en) | 2012-06-05 | 2016-11-22 | Brigham Young University | Corrosion-resistant, strong x-ray window |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5749879A (en) * | 1980-09-10 | 1982-03-24 | Toshiba Corp | Detector for radiation |
-
1983
- 1983-10-21 JP JP58196045A patent/JPS6089054A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5749879A (en) * | 1980-09-10 | 1982-03-24 | Toshiba Corp | Detector for radiation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2525383A3 (en) * | 2011-05-16 | 2014-01-01 | Brigham Young University | Carbon composite support structure |
| US9076628B2 (en) | 2011-05-16 | 2015-07-07 | Brigham Young University | Variable radius taper x-ray window support structure |
| WO2013049784A1 (en) * | 2011-09-30 | 2013-04-04 | Composite Mirror Applications, Inc. | Solar collector having a substrate with multiple composite plies |
| US9502206B2 (en) | 2012-06-05 | 2016-11-22 | Brigham Young University | Corrosion-resistant, strong x-ray window |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0259582B2 (en) | 1990-12-12 |
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