JP2007003470A - Radiation measuring device - Google Patents

Radiation measuring device Download PDF

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JP2007003470A
JP2007003470A JP2005186802A JP2005186802A JP2007003470A JP 2007003470 A JP2007003470 A JP 2007003470A JP 2005186802 A JP2005186802 A JP 2005186802A JP 2005186802 A JP2005186802 A JP 2005186802A JP 2007003470 A JP2007003470 A JP 2007003470A
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radiation
ground pattern
circuit board
detection element
measuring apparatus
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Kazuhiro Koizumi
和裕 小泉
Yuji Matsuzoe
雄二 松添
Takeshi Sakamaki
剛 酒巻
Iwao Matsumoto
巌 松本
Tomoya Nunomiya
智也 布宮
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Fuji Electric Co Ltd
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Fuji Electric Holdings Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation measuring device that has high noise resistance and can be manufactured inexpensively. <P>SOLUTION: A rectangular frame-shaped shielding section 12 is integrally disposed on the inner surface of a box-shaped upper case 1 made of metal, and a radiation detection element 5 and amplifying circuit 6 are stored in this shielding section 12. A rectangular tubular ground pattern 15 is formed with a conductive wiring pattern around the radiation detection element 5 and amplifying circuit 6 fixed to the upper surface of a signal processing circuit board 3. This ground pattern 15 is connected to the ground of the signal processing circuit board 3. The shielding section 12 is made of a conductive material such as metal so that a round edge of the rectangular frame has the same shape as that of the ground pattern 15. The ground pattern 15 is electrically connected to the round edge of the shielding section 12 to fix the signal processing circuit board 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、原子力発電所等の放射線管理区域内等において放射線量を計測する放射線測定装置に関する。   The present invention relates to a radiation measuring apparatus that measures a radiation dose in a radiation control area such as a nuclear power plant.

従来の放射線測定装置は、図５の外形斜視図に示すように、金属製で箱型の上ケース１及び下ケース２から成るセンサケース１１の内部に信号処理回路基板３が収納されて構成されている。
信号処理回路基板３は、図６の上面図及び図７の断面図に示すように、基板上面に、放射線を検出する放射線検出素子５と、この放射線検出素子５からの検出信号を増幅する増幅回路６と、この増幅回路６からの増幅信号に基づき放射線量を演算することによって検知する放射線演算処理回路７と、外部電磁波による誤動作除去を目的に配置されたシールドケース４とが配置されて構成されている。 As shown in the external perspective view of FIG. 5, the conventional radiation measuring apparatus is configured by a signal processing circuit board 3 housed in a sensor case 11 made of a metal box and composed of an upper case 1 and a lower case 2. ing.
As shown in the top view of FIG. 6 and the cross-sectional view of FIG. 7, the signal processing circuit board 3 has a radiation detection element 5 for detecting radiation and an amplification for amplifying the detection signal from the radiation detection element 5 on the top face of the substrate. A circuit 6, a radiation calculation processing circuit 7 that detects by calculating a radiation dose based on an amplified signal from the amplification circuit 6, and a shield case 4 that is arranged for the purpose of removing malfunction caused by external electromagnetic waves are arranged. Has been.

通常、このような放射線測定装置１００は、放射線検出素子５からの検出信号を増幅回路６によって増幅し、この増幅信号に基づいて、ＣＰＵなどから構成されている放射線演算処理回路７で放射線量を演算することにより検知している。
一般的に、放射線を検出したときに放射線検出素子５から出力される検出信号は、非常に微小な信号であるため、増幅回路６の増幅率は非常に大きく、且つ増幅回路６は非常にインピーダンスの高い回路構成となっている。 Usually, such a radiation measuring apparatus 100 amplifies a detection signal from the radiation detection element 5 by an amplification circuit 6, and based on this amplification signal, the radiation calculation processing circuit 7 constituted by a CPU or the like calculates a radiation dose. It is detected by calculating.
In general, since the detection signal output from the radiation detection element 5 when detecting radiation is a very small signal, the amplification factor of the amplifier circuit 6 is very large, and the amplifier circuit 6 is very impedance. The circuit configuration is high.

このような高インピーダンス回路は外来ノイズの影響を受けやすく、特に、外部からの電磁波ノイズに対して十分な対策が必要とされる。このノイズ対策として、一般的に図８に斜視図を示すようなシールドケース４が用いられる。シールドケース４は、金属の板材等で製作されたものであり、信号処理回路基板３の上に固定される。例えば、図示のように信号処理回路基板３に形成された複数の貫通穴３ａに、シールドケース４の複数の凸部４ａが嵌め込まれて固定される。   Such a high-impedance circuit is easily affected by external noise, and in particular, sufficient countermeasures are required against external electromagnetic noise. As a countermeasure against this noise, a shield case 4 having a perspective view shown in FIG. 8 is generally used. The shield case 4 is made of a metal plate or the like, and is fixed on the signal processing circuit board 3. For example, as shown in the drawing, the plurality of convex portions 4 a of the shield case 4 are fitted and fixed in the plurality of through holes 3 a formed in the signal processing circuit board 3.

シールドケース４の内部には、放射線検出素子５と増幅回路６が収納され、このようなシールド構造により、外来ノイズを遮断して誤動作なく放射線量を検知している。
この種の従来の放射線測定装置として、例えば特許文献１に記載のものがある。
特開平１１−６４５２３号公報 Inside the shield case 4, a radiation detection element 5 and an amplifier circuit 6 are housed. With such a shield structure, external noise is blocked and the radiation dose is detected without malfunction.
As this type of conventional radiation measuring apparatus, there is one disclosed in Patent Document 1, for example.
JP-A-11-64523

しかし、従来の放射線測定装置においては、外来ノイズの影響を除去するためのシールドケース４に隙間がある場合、電磁波が漏洩するので、その端部にロー付け加工又は金属箔テープを貼るなどの加工が必要とされる。この加工は手間が掛かるので高コストとなり、その分、放射線測定装置が高価格となる問題がある。
本発明は、このような課題に鑑みてなされたものであり、高いノイズ耐性を有して安価に製作することができる放射線測定装置を提供することを目的としている。 However, in the conventional radiation measuring apparatus, when there is a gap in the shield case 4 for removing the influence of external noise, electromagnetic waves leak, so that processing such as brazing or attaching a metal foil tape to the end thereof Is needed. This processing takes time and is expensive, and there is a problem that the radiation measuring apparatus is expensive.
The present invention has been made in view of such problems, and an object of the present invention is to provide a radiation measurement apparatus that has high noise resistance and can be manufactured at low cost.

上記目的を達成するために、本発明の請求項１による放射線測定装置は、導電性のセンサケースの内部に、放射線を検出する放射線検出素子と、この素子の検出信号を増幅する増幅回路と、この増幅回路での増幅信号に基づき放射線量を演算して検知する放射線量演算回路と、これら放射線検出素子、増幅回路及び放射線量演算回路が実装された回路基板とを収容して成る放射線測定装置において、前記回路基板に、前記放射検出素子と前記増幅回路との実装領域の外側にアースに接続された導電性のグランドパターンを周回して形成し、前記センサケースの内面に、前記グランドパターンと同形状の周回縁を有する導電性で枠型のシールド部を一体に形成し、前記シールド部の内部に前記放射線検出素子及び前記増幅回路を収容し、且つ前記周回縁に前記グランドパターンを電気的に接続して当該シールド部に前記回路基板を固定したことを特徴とする。   To achieve the above object, a radiation measuring apparatus according to claim 1 of the present invention includes, inside a conductive sensor case, a radiation detection element for detecting radiation, an amplification circuit for amplifying a detection signal of the element, A radiation measurement apparatus containing a radiation dose calculation circuit that calculates and detects a radiation dose based on an amplification signal in the amplification circuit, and a circuit board on which the radiation detection element, the amplification circuit, and the radiation dose calculation circuit are mounted. In the circuit board, a conductive ground pattern connected to the ground is formed outside the mounting region of the radiation detection element and the amplifier circuit, and the ground pattern is formed on the inner surface of the sensor case. A conductive frame-shaped shield part having a circumferential edge of the same shape is integrally formed, the radiation detection element and the amplifier circuit are accommodated in the shield part, and the front The ground pattern on the circumferential edge and electrically connected, characterized in that fixed to the circuit board to the shield portion.

この構成によれば、シールド部が、放射線検出素子及び増幅回路を収容して且つグランドパターンを電気的に接続して回路基板に固定されているので、シールド部に伝搬する外来電磁波をグランドパターンを介してアースに落とすことができ、これによって高いノイズ耐性を実現することができる。しかも、外来電磁波をアースに落とす構造なので、シールド部とグランドパターンとに隙間があっても電磁波を除去することが可能となる。これによって、従来のシールドケースのような高コストな隙間の補修加工が不要となる。また、シールド部は金型によってセンサケースと一体型に形成することができるので、従来の別材料であるシールドケースを用いるよりも安価となる。これらの理由から放射線測定装置を安価に製作することができる。   According to this configuration, since the shield part contains the radiation detection element and the amplification circuit and is electrically connected to the ground pattern and fixed to the circuit board, the external electromagnetic wave propagating to the shield part is prevented from passing through the ground pattern. Can be dropped to ground, thereby realizing high noise immunity. In addition, since the external electromagnetic wave is dropped to the ground, the electromagnetic wave can be removed even if there is a gap between the shield part and the ground pattern. This eliminates the need for costly gap repair work as in the conventional shield case. Further, since the shield portion can be formed integrally with the sensor case by a mold, it is less expensive than using a shield case which is a conventional separate material. For these reasons, the radiation measuring apparatus can be manufactured at a low cost.

また、本発明の請求項２による放射線測定装置は、請求項１において、前記シールド部の周回縁及び前記グランドパターンの上の何れか一方に、導電性且つ柔軟性を有するガスケットを貼り付けたことを特徴とする。
この構成によれば、シールド部とグランドパターンとの間に隙間が生じなくなるので、より高いノイズ耐性を実現することができる。 The radiation measuring apparatus according to claim 2 of the present invention is the radiation measuring apparatus according to claim 1, wherein a conductive and flexible gasket is affixed to one of the circumferential edge of the shield part and the ground pattern. It is characterized by.
According to this configuration, since no gap is generated between the shield part and the ground pattern, higher noise resistance can be realized.

また、本発明の請求項３による放射線測定装置は、請求項１又は２において、前記センサケースは金属製であることを特徴とする。
この構成によれば、放射線測定装置を丈夫に形成することができる。
また、本発明の請求項４による放射線測定装置は、請求項１又は２において、前記センサケースは導電塗装されたプラスチック製であることを特徴とする。
この構成によれば、センサケースがプラスチック製なので材料費が安価となり、更に、シールド部を含むセンサケースを製作する場合に、低コストの樹脂製の金型で作成可能となるので、より低コスト化を図ることが可能となる。 The radiation measuring apparatus according to claim 3 of the present invention is characterized in that, in claim 1 or 2, the sensor case is made of metal.
According to this configuration, the radiation measuring apparatus can be formed robustly.
According to a fourth aspect of the present invention, there is provided the radiation measuring apparatus according to the first or second aspect, wherein the sensor case is made of a plastic with conductive coating.
According to this configuration, since the sensor case is made of plastic, the material cost is low, and when a sensor case including a shield portion is manufactured, it can be made with a low-cost resin mold, so that the cost is lower. Can be achieved.

以上説明したように本発明によれば、放射線測定装置を高いノイズ耐性を有して安価に製作することができるという効果がある。   As described above, according to the present invention, there is an effect that the radiation measuring apparatus can be manufactured at low cost with high noise resistance.

以下、本発明の実施の形態を、図面を参照して説明する。但し、本明細書中の全図において相互に対応する部分には同一符号を付し、重複部分においては後述での説明を適時省略する。
図１は、本発明の実施の形態に係る放射線測定装置の構成を示す斜視図である。
図１に示す放射線測定装置１０が、図５に示した従来の放射線測定装置１００と異なる点は、金属製の箱型の上ケース１の内面に、従来のシールドケース４に相当する長方形の枠型のシールド部１２を一体に設け、このシールド部１２に放射線検出素子５及び増幅回路６を収容する構成とした。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
FIG. 1 is a perspective view showing a configuration of a radiation measuring apparatus according to an embodiment of the present invention.
The radiation measuring apparatus 10 shown in FIG. 1 is different from the conventional radiation measuring apparatus 100 shown in FIG. 5 in that a rectangular frame corresponding to the conventional shield case 4 is formed on the inner surface of the upper case 1 made of metal. A shield part 12 of a mold is provided integrally, and the radiation detection element 5 and the amplifier circuit 6 are accommodated in the shield part 12.

更に詳細に図２及び図３を参照して説明する。図２は、シールド部１２及び信号処理回路基板３を上ケース１側から透視して見た図である。図３は放射線測定装置１０の特徴部の断面図である。
信号処理回路基板３の上面には、当該上面に固定された放射線検出素子５及び増幅回路６の周囲に長方形の管状にグランドパターン１５が、銅やアルミニュウム材料等の導電性の配線パターンにて形成されている。このグランドパターン１５は信号処理回路基板３のアースに接続されている。 Further details will be described with reference to FIGS. FIG. 2 is a view of the shield 12 and the signal processing circuit board 3 as seen through from the upper case 1 side. FIG. 3 is a cross-sectional view of a characteristic part of the radiation measuring apparatus 10.
On the upper surface of the signal processing circuit board 3, a ground pattern 15 is formed in a rectangular tubular shape around the radiation detection element 5 and the amplifier circuit 6 fixed on the upper surface, and is formed of a conductive wiring pattern such as copper or aluminum material. Has been. The ground pattern 15 is connected to the ground of the signal processing circuit board 3.

シールド部１２は、金属などの導電性材料によって形成され、更に、長方形の枠の周回縁がグランドパターン１５と同形状に形成されている。
このようなシールド部１２に信号処理回路基板３を固定する場合は、シールド部１２の周回縁に、グランドパターン１５を電気的に接続して信号処理回路基板３を固定する。
以上のような本実施の形態の放射線測定装置１０によれば、上記のように固定することによって、シールド部１２に伝搬する外来電磁波をグランドパターン１５を介してアースに落とすことができるので、高いノイズ耐性を実現することができる。 The shield portion 12 is formed of a conductive material such as metal, and the peripheral edge of the rectangular frame is formed in the same shape as the ground pattern 15.
When the signal processing circuit board 3 is fixed to the shield part 12, the signal processing circuit board 3 is fixed by electrically connecting the ground pattern 15 to the peripheral edge of the shield part 12.
According to the radiation measuring apparatus 10 of the present embodiment as described above, since the external electromagnetic wave propagating to the shield part 12 can be dropped to the ground via the ground pattern 15 by fixing as described above, it is high. Noise immunity can be realized.

しかも、上記のように外来電磁波をアースに落とす構造なので、シールド部１２とグランドパターン１５とに隙間があっても電磁波を除去することが可能となる。これによって、従来のシールドケース４のような高コストな隙間の補修加工が不要となる。また、シールド部１２は金型によって上ケース１と一体型に形成することができるので、従来の別材料であるシールドケース４を用いるよりも安価となる。これらの理由から放射線測定装置１０を安価に製作することができる。   In addition, since the external electromagnetic wave is dropped to the ground as described above, the electromagnetic wave can be removed even if there is a gap between the shield part 12 and the ground pattern 15. This eliminates the need for costly repairing of the gap as in the conventional shield case 4. Moreover, since the shield part 12 can be integrally formed with the upper case 1 by a mold, it is cheaper than using the shield case 4 which is a conventional different material. For these reasons, the radiation measuring apparatus 10 can be manufactured at low cost.

また、シールド部１２は、金属製に限らず、導電塗装されたプラスチック製としても良い。この場合、プラスチック製なので材料費が安価となり、更に、シールド部１２を含む上ケース１を製作する場合に、低コストの樹脂製の金型で作成可能となるので、より低コスト化を図ることが可能となる。
この他、図４に示すように、シールド部１２の周回縁又はグランドパターン１５の上にガスケット１３を貼り付けてもよい。ガスケット１３は、スポンジに金属材料を組み合わせたものや、導電性ゴムなどの柔軟性のある導電材料を用いる。
このようにガスケット１３を用いることによってシールド部１２とグランドパターン１５との間に隙間が生じなくなるので、より高いノイズ耐性を実現することができる。 Further, the shield portion 12 is not limited to metal, and may be made of conductively painted plastic. In this case, since it is made of plastic, the material cost is low, and when the upper case 1 including the shield portion 12 is manufactured, it can be made with a low-cost resin mold, so that the cost can be further reduced. Is possible.
In addition, as shown in FIG. 4, a gasket 13 may be affixed on the circumferential edge of the shield part 12 or the ground pattern 15. The gasket 13 uses a combination of a sponge and a metal material, or a flexible conductive material such as conductive rubber.
By using the gasket 13 in this way, no gap is generated between the shield portion 12 and the ground pattern 15, so that higher noise resistance can be realized.

本発明の実施の形態に係る放射線測定装置の構成を示す斜視図である。It is a perspective view which shows the structure of the radiation measuring device which concerns on embodiment of this invention. 上記実施の形態の放射線測定装置におけるシールド部及び信号処理回路基板を上ケース側から透視して見た図である。It is the figure which looked through the shield part and signal processing circuit board in the radiation measuring device of the said embodiment from the upper case side. 上記実施の形態の放射線測定装置の特徴部分の断面図である。It is sectional drawing of the characteristic part of the radiation measuring device of the said embodiment. 上記実施の形態の変形例による放射線測定装置の特徴部分の断面図である。It is sectional drawing of the characteristic part of the radiation measuring device by the modification of the said embodiment. 従来の放射線測定装置の構成を示す斜視図である。It is a perspective view which shows the structure of the conventional radiation measuring device. 従来の放射線測定装置における信号処理回路基板の構成を示す平面図である。It is a top view which shows the structure of the signal processing circuit board in the conventional radiation measuring device. 従来の放射線測定装置における信号処理回路基板の構成を示す断面図である。It is sectional drawing which shows the structure of the signal processing circuit board in the conventional radiation measuring device. 従来の放射線測定装置における信号処理回路基板へのシールドケースの組み込みの説明図である。It is explanatory drawing of the assembly of the shield case to the signal processing circuit board in the conventional radiation measuring device.

符号の説明Explanation of symbols

１ 上ケース
２ 下ケース
３ 信号処理回路基板
３ａ 貫通穴
４ シールドケース
４ａ 凸部
５ 放射線検出素子
６ 増幅回路
７ 放射線演算処理回路
１０ 放射線測定装置
１１ センサケース
１２ シールド部
１３ ガスケット
１５ グランドパターン DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Signal processing circuit board 3a Through-hole 4 Shield case 4a Convex part 5 Radiation detection element 6 Amplifying circuit 7 Radiation calculation processing circuit 10 Radiation measurement apparatus 11 Sensor case 12 Shield part 13 Gasket 15 Ground pattern

Claims (4)

導電性のセンサケースの内部に、放射線を検出する放射線検出素子と、この素子の検出信号を増幅する増幅回路と、この増幅回路での増幅信号に基づき放射線量を演算して検知する放射線量演算回路と、これら放射線検出素子、増幅回路及び放射線量演算回路が実装された回路基板とを収容して成る放射線測定装置において、
前記回路基板に、前記放射検出素子と前記増幅回路との実装領域の外側にアースに接続された導電性のグランドパターンを周回して形成し、
前記センサケースの内面に、前記グランドパターンと同形状の周回縁を有する導電性で枠型のシールド部を一体に形成し、
前記シールド部の内部に前記放射線検出素子及び前記増幅回路を収容し、且つ前記周回縁に前記グランドパターンを電気的に接続して当該シールド部に前記回路基板を固定した
ことを特徴とする放射線測定装置。 Inside the conductive sensor case, a radiation detection element that detects radiation, an amplification circuit that amplifies the detection signal of this element, and a radiation amount calculation that detects and detects the radiation dose based on the amplification signal from this amplification circuit In a radiation measurement apparatus comprising a circuit and a circuit board on which these radiation detection elements, amplification circuits, and radiation dose calculation circuits are mounted,
On the circuit board, a conductive ground pattern connected to the ground is formed outside the mounting area of the radiation detection element and the amplifier circuit,
On the inner surface of the sensor case, a conductive and frame-shaped shield part having a circumferential edge of the same shape as the ground pattern is integrally formed,
Radiation measurement characterized in that the radiation detection element and the amplification circuit are accommodated in the shield part, and the ground pattern is electrically connected to the peripheral edge and the circuit board is fixed to the shield part. apparatus. 前記シールド部の周回縁及び前記グランドパターンの上の何れか一方に、導電性且つ柔軟性を有するガスケットを貼り付けた
ことを特徴とする請求項１に記載の放射線測定装置。 The radiation measuring apparatus according to claim 1, wherein a conductive and flexible gasket is attached to one of the circumferential edge of the shield part and the ground pattern. 前記センサケースは金属製である
ことを特徴とする請求項１又は２に記載の放射線測定装置。 The radiation measuring apparatus according to claim 1, wherein the sensor case is made of metal. 前記センサケースは導電塗装されたプラスチック製である
ことを特徴とする請求項１又は２に記載の放射線測定装置。
The radiation measuring apparatus according to claim 1, wherein the sensor case is made of conductively coated plastic.
JP2005186802A 2005-06-27 2005-06-27 Radiation measuring device Pending JP2007003470A (en)

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JP2008304460A (en) * 2007-06-07 2008-12-18 General Electric Co <Ge> Emi shielding of digital x-ray detector with non-metallic enclosures
JP2009300084A (en) * 2008-06-10 2009-12-24 Toshiba Corp Radiation detection device
JP2010156671A (en) * 2008-12-01 2010-07-15 Mitsubishi Electric Corp Ionization chamber sensor and dose distribution measurement system
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