JPH0392788A - Body surface pollution monitor - Google Patents
Body surface pollution monitorInfo
- Publication number
- JPH0392788A JPH0392788A JP22949389A JP22949389A JPH0392788A JP H0392788 A JPH0392788 A JP H0392788A JP 22949389 A JP22949389 A JP 22949389A JP 22949389 A JP22949389 A JP 22949389A JP H0392788 A JPH0392788 A JP H0392788A
- Authority
- JP
- Japan
- Prior art keywords
- measured
- detector
- detection efficiency
- distance
- radiation
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000005855 radiation Effects 0.000 claims description 29
- 238000011109 contamination Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、例えば放射線管理設備などに釦いて、放射
線管理区域から退出する作業者の身体に付着した放射性
物質からの放射線を測定する身体表面汚染モニタに関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for measuring radiation from radioactive substances attached to the body of a worker who is exiting a radiation control area by pressing a button on, for example, radiation control equipment. Concerning contamination monitors.
第２図は例えば実開昭５６−１１６８７６号公報に示さ
れた従来の身体表面汚染モニタを示す側面図である。図
において、（１）は被測定身体、（２）は被測定身体（
１）を囲む形で形或された測定室、（３）￥ｉ測定室（
２）の前面壁に配列された前面検出器、（４）は測定室
（２）の背面壁に配列された背面検出器、（５）は測定
室（２）の床面に配列された床面検出器、（６）は被測
定身体（１）の頭部に配置された頭部検出器、（７）は
測定室（２）の側面扉（１２）に配列された側面検出器
、（８）は前置増巾器、（９）ぱ主増巾器、（１０）ｕ
波高弁別器、（１１）はカウンタ、（１３）は頭部検出
器（６）の先端に取り付けられた位置検出器、（１８）
は駆動機構、（ｌ９）は駆動モータ、（２０）は駆動制
御部である。な釦、前置増巾器（８）、主増巾器（９）
、波高弁別器（１０）、カウンタ（１１）、駆動機構（
ｌ８）、駆動モータ（１９）ｈよび駆動制御部（２０）
は身体表面汚染モニタ本体（２１）内に組み込筐れでい
る。FIG. 2 is a side view of a conventional body surface contamination monitor disclosed in, for example, Japanese Utility Model Application Publication No. 56-116876. In the figure, (1) is the body to be measured, and (2) is the body to be measured (
1) A measurement chamber shaped to surround the (3) ￥i measurement chamber (
(2) is a front detector arranged on the front wall of the measurement room (2), (4) is a rear detector arranged on the back wall of the measurement room (2), and (5) is a floor detector arranged on the floor of the measurement room (2). A surface detector, (6) a head detector placed on the head of the body to be measured (1), (7) a side detector arranged on the side door (12) of the measurement chamber (2), ( 8) is a front amplifier, (9) a main amplifier, (10) u
Wave height discriminator, (11) is a counter, (13) is a position detector attached to the tip of the head detector (6), (18)
is a drive mechanism, (l9) is a drive motor, and (20) is a drive control section. button, preamplifier (8), main amplifier (9)
, wave height discriminator (10), counter (11), drive mechanism (
l8), drive motor (19)h and drive control section (20)
is housed in the body surface contamination monitor main body (21).
次に動作について説明する。側面扉（１２）が開放され
た状態において被測定者が測定室（２）に入ると、図示
していない位置検出器が被測定身体（１）を検知して側
面扉（１２）を閉じ、次に駆動制御部（２０）の指令で
駆動モータ（１９）を起動し、駆動機構（１８）を通じ
て頭部検出器（６）を下降させ、位置検出器（１３）に
より被測定身体（１）の頭部と頭部検出器（６）との距
離があらかじめ設定した値となる位置で停止させる。そ
の後、測定を開始する。測定室（２）の周囲に配置され
た検出器（３）， （４）， （５）， （６）により
、被測定身体（１）からの放射線を検知し、検出器出力
信号は前置増巾器（８）、主増巾器（９）により増巾さ
れ、波高弁別器（１０）にて雑音信号を除いた後、カウ
ンタ（１１）に入り計数され、被測定身体（１）の放射
線レベルが測定される。Next, the operation will be explained. When the person to be measured enters the measurement room (2) with the side door (12) open, a position detector (not shown) detects the body to be measured (1) and closes the side door (12). Next, the drive motor (19) is started in response to a command from the drive control unit (20), the head detector (6) is lowered through the drive mechanism (18), and the position detector (13) moves the body to be measured (1). The object is stopped at a position where the distance between the head of the person and the head detector (6) is a preset value. After that, start measurement. Radiation from the body to be measured (1) is detected by detectors (3), (4), (5), and (6) placed around the measurement chamber (2), and the detector output signal is After being amplified by an amplifier (8) and a main amplifier (9) and removing noise signals by a pulse height discriminator (10), it is counted by a counter (11), and the signal of the body to be measured (1) is Radiation levels are measured.
測定された放射線レベルをあらかじめ設定された許容値
と比較し結果を図示していない表示部を通じて被測定者
に異常の有無を知らせると共に側面扉（１２）を開放し
て、被測定者を測定室（２）より退出させる。The measured radiation level is compared with a preset tolerance value, and the results are displayed on a display (not shown) to inform the person being measured whether there is an abnormality or not.The side door (12) is opened and the person is taken into the measurement room. (2) Make the person leave.
［発明が解決しようとする課題］
従来の身体表面汚染モニタは以上のように構或されてい
るので、検出器の測定精度の低下を防ぎ一定の検出効率
を得るために、被測定者の身長に応じて、頭部検出器を
移動させ、この検出器と被測定者との距離を一定とるこ
とが必要であり、検出器の駆動機構、駆動モータ、及び
駆動制御部を設けなければならず装置が犬がかりになる
上、頭部検出器の移動に伴なう装置全体の信頼性低下、
測定処理時間が余分にかかるなどの課題があった、
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、駆動部を省くとともに、被測定者の身長によら
ず、一定の検出効率、測定精度を得ることができる身体
表面汚染モニタを提供することを目的とする。[Problems to be Solved by the Invention] Conventional body surface contamination monitors are constructed as described above. Depending on the situation, it is necessary to move the head detector to maintain a constant distance between the detector and the subject, and a drive mechanism, drive motor, and drive control unit for the detector must be provided. Not only does the device rely on a dog, but the reliability of the device as a whole decreases due to the movement of the head detector.
This invention was made to solve the above-mentioned problems, such as the measurement process taking an extra amount of time. The purpose is to provide a body surface contamination monitor that can obtain efficiency and measurement accuracy.
［課題を解決するための手段］
この発明に係る身体表面汚染モニタは、被測定身体の周
囲に配置され被測定身体からの放射線を検知する放射線
検出器を有し、上記被測定身体からの放射線量を測定す
る身体表面汚染モニタに釦いて、
上記放射線検出器の上記被測定身体までの距離に応じた
検出効率を記憶した記憶装置と、少なくとも被測定身体
の上方に配置された頭部検出器と被測定身体の頭部との
間の距離を検知する位置検出器と、この位置検出器で検
知された距離に対応した上記検出効率により上記放射線
量を補正演算する演算装置を設けたものである。[Means for Solving the Problems] A body surface contamination monitor according to the present invention includes a radiation detector placed around the body to be measured to detect radiation from the body to be measured, A body surface contamination monitor for measuring the amount of radiation has a storage device storing a detection efficiency corresponding to the distance of the radiation detector to the body to be measured, and a head detector disposed at least above the body to be measured. and the head of the body to be measured, and a calculation device that corrects the radiation dose using the detection efficiency corresponding to the distance detected by the position detector. be.
〔作用Ｊ
この発明に訃ける身体表面汚染モニタは、被測定身体渣
での距離に応じた放射線検出器の検出効率を記憶装置に
記憶してかり、位置検出器で少なくとも被測定身体の上
方に配置された頭部検出器と被測定身体の頭部との間の
距離を検知して、演算装置で上記検知された距離に対応
した上記検出効率により被測定身体から測定の放射線量
を補正演算する。[Operation J] The body surface contamination monitor according to the present invention stores the detection efficiency of the radiation detector according to the distance on the body part to be measured in the storage device, and uses the position detector to detect at least the area above the body part to be measured. The distance between the placed head detector and the head of the body to be measured is detected, and the calculation device corrects the radiation dose measured from the body to be measured using the detection efficiency corresponding to the detected distance. do.
以下、この発明の一実施例を図について説明する。第１
図に釦いて、（１）から（１３）は上記従来のものと同
一のものである。（１４）はカウンタ（１１）及び位置
検出器（１３）の出力信号を入力し、所定のプログラム
に従ってカウンタ（１１）からの出力を補正演算処理す
る演算装置、（１５）は被測定身体（１）までの距離に
応じた頭部検出器（６）の検出効率を記憶した記憶装置
である。な釦、前置増巾器（８）、主増巾器（９），波
高弁別器（１０） ，カウンタ（１１．），演算装置（
１４）釦よび記憶装置（１５）は身体表面汚染モニタ本
体（２１）内に組み込まれている。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, buttons (1) to (13) are the same as the conventional one. (14) is a calculation device which inputs the output signals of the counter (11) and the position detector (13) and performs correction calculation processing on the output from the counter (11) according to a predetermined program; (15) is the body to be measured (1); ) is a storage device that stores the detection efficiency of the head detector (6) according to the distance to the head detector (6). button, front amplifier (8), main amplifier (9), wave height discriminator (10), counter (11.), arithmetic unit (
14) The button and memory device (15) are built into the body surface contamination monitor body (21).
次に、上記のように構或された身体表面汚染モニタの動
作について説明する。Next, the operation of the body surface contamination monitor constructed as described above will be explained.
一般に、被測定身体（１）を線源とみなした場合、線源
による放射線検出器のレスポンスＲは次式で示される。Generally, when the body to be measured (1) is regarded as a radiation source, the response R of the radiation detector due to the radiation source is expressed by the following equation.
Ｒｏｃａ−ｆＧ−ｒε・ｆａｂ−Ｓ・・・（１）ただし
、ａは線源の放射能
ｆＱぱ検出器を見込む幾何学的効率
ｆεは検出器の固有効率
’ａｂは放射線の減衰係数
Ｓぱ測定対象となる被測定身体（１）の身体表面積であ
る。Roca-fG-rε・fab-S... (1) where a is the radioactivity of the radiation source fQ, the geometric efficiency looking into the detector fε is the specific efficiency of the detector 'ab, the attenuation coefficient S of the radiation This is the body surface area of the body to be measured (1) to be measured.
いま、被測定身体（１）の身長によって、レヌポンスＲ
の変動するパラメータは（１）式に釦いて、幾何学的効
率ｆＧと減衰係数ｆａｂである。即ち幾何学的効率ｆ（
．と減哀効率ｆａｂとからなる検出効率が既知であり、
かつ、これを決定する被測定身体（１）から検出ＲＦｊ
までの距離が判れば、被測定身体（１）の身長のバラツ
キによる計測誤差を補正することができる。Now, depending on the height of the body to be measured (1), Renupons R
The parameters that vary are the geometrical efficiency fG and the damping coefficient fab, as shown in equation (1). That is, the geometric efficiency f(
．． The detection efficiency consisting of and the reduction efficiency fab is known,
And RFj detected from the body to be measured (1) to determine this
Once the distance is known, measurement errors due to variations in the height of the body to be measured (1) can be corrected.
従って、被測定身体（１）の頭部と頭部検出器（６）と
の間の距離に対応した頭部検出器（６）の検出効率を、
身体を模擬したファントム等を使用してあらかじめ求め
て、記憶装置（１５）に記憶しておく。Therefore, the detection efficiency of the head detector (6) corresponding to the distance between the head of the body to be measured (1) and the head detector (6) is
It is obtained in advance using a phantom or the like that simulates the body, and is stored in the storage device (15).
次に、側面扉（１２）が開放された状態に訃いて、被′
ｌＡＩＪ走者が測定室（２）に入ると、図示していない
位置検出器が被測定身体（１）を検知して側面扉（１２
）を閉じる。次いで、測定室（２）の天井部に配置した
例えば超音波センサーなどの位置検出器（１３）により
被測定身体（１）の頭部と頭部検出器（６）との距離を
測定し、距離信号を演算装置（１４）に入力する。Next, with the side door (12) open, the
When the lAIJ runner enters the measurement room (2), a position detector (not shown) detects the body to be measured (1) and closes the side door (12).
) close. Next, the distance between the head of the body to be measured (1) and the head detector (6) is measured by a position detector (13) such as an ultrasonic sensor placed on the ceiling of the measurement room (2), The distance signal is input to the calculation device (14).
これと並行して、測定室（２）の周囲に配置した検出器
（３）， （４Ｌ （５）， （６）により、被測定身
体（１）からの放射線を検知する。検出器出力信号は前
置増１４】器（８）、主増巾器（９）により増巾され、
波高弁別器（１０）にて雑音信号を除いた後、カウンタ
（１１）に入り計数される。計数結果は演算装置（ｌ４
）に入力される，演算装置（１４）にかいては距離信号
に応じた検出効率をあらかじめ記憶させた記憶装置（１
５）から、位置検出器（１３）の信号から得た距離に対
応した検出効率を呼び出し、この値を使って入力された
計数結果を補正演算する。In parallel, radiation from the body to be measured (1) is detected by detectors (3), (4L (5), (6)) placed around the measurement chamber (2).Detector output signal is amplified by the preamplifier (8) and the main amplifier (9),
After noise signals are removed by a pulse height discriminator (10), the signals enter a counter (11) and are counted. The counting results are sent to the arithmetic unit (l4
), the arithmetic unit (14) has a storage device (14) that stores in advance the detection efficiency according to the distance signal.
5), the detection efficiency corresponding to the distance obtained from the signal of the position detector (13) is called, and this value is used to correct the input counting result.
このようにして被測定者の身長に応じて計数結果を補正
するので、検出器を移動することなく、一定の検出効率
で身体表面汚染の放射能レベルを測定できる。In this way, the counting results are corrected according to the height of the person to be measured, so the radioactivity level of body surface contamination can be measured with constant detection efficiency without moving the detector.
なか、上記実施例では、頭部について述べたが、必要に
応じて他の部位に対しても同様の手法で補正することは
できる。In the above embodiments, the head was described, but other parts can be corrected using the same method if necessary.
さらに被測定体が身体以外のものであっても良く、上記
実施例と同様の効果を奏する。Furthermore, the object to be measured may be something other than the body, and the same effects as in the above embodiments can be achieved.
以上のように、この発明によれば、
被測定身体の周囲に配置され被測定身体からの放射線を
検知する放射線検出器を有し、上記被測定身体からの放
射線量を測定する身体表面汚染モ二夕に釦いて、
上記放射線検出器の上記被測定身体までの距離に応じた
検出効率を記憶した記憶装置と、少な〈とも被測定身体
の上方に配置された頭部検出器と被測定身体の頭部との
間の距離を検知する位置検出器と、この位置検出器で検
知された距離に対応した上記検出効率により上記放射Ｍ
量を補正演算する演算装置を備えるように構或したので
、頭部検出器を移動することな〈精度の高い放射線測定
ができる上、頭部検出器の移動に係わる駆動装置を省く
ことが可能となるので、装置が安価にでき、かつ、信頼
性も向上できるものが得られる効果がある。As described above, according to the present invention, there is provided a body surface contamination monitor that has a radiation detector arranged around a body to be measured and detects radiation from the body to be measured, and measures the radiation dose from the body to be measured. A storage device that stores the detection efficiency of the radiation detector according to the distance to the body to be measured, a head detector disposed above the body to be measured, and a body to be measured are pressed at the same time. A position detector detects the distance between the head and the head, and the radiation M
Since the structure is equipped with a calculation device that corrects and calculates the amount, it is possible to perform highly accurate radiation measurements without moving the head detector, and it is possible to omit the drive device involved in moving the head detector. Therefore, there is an effect that the device can be manufactured at low cost and the reliability can be improved.
第１図はこの発明の一実施例による身体表面汚染モニタ
を示す構或図、第２図は従来の身体表面汚染モニタを示
す構或図である。
図において、（６）は頭部検出器、（１３）は位置検出
器、（１４）は演算装置、（１５）は記憶装飲でｔツる
。
なお、図中同一符号は同一、又は和当ｆぶ分を示すウ
代 理 人 大 岩 増 雄（ｌＯ）
第１図
特開平３
９２７８８ （４）
第２図FIG. 1 is a block diagram showing a body surface contamination monitor according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional body surface contamination monitor. In the figure, (6) is a head detector, (13) is a position detector, (14) is an arithmetic unit, and (15) is a memory device. In addition, the same reference numerals in the figures indicate the same numbers or portions of the sum.
Claims (1)
検知する放射線検出器を有し、上記被測定身体からの放
射線量を測定する身体表面汚染モニタにおいて、 上記放射線検出器の上記被測定身体までの距離に応じた
検出効率を記憶した記憶装置と、少なくとも被測定身体
の上方に配置された頭部検出器と被測定身体の頭部との
間の距離を検知する位置検出器と、この位置検出器で検
知された距離に対応した上記検出効率により上記放射線
量を補正演算する演算装置を備えたことを特徴とする身
体表面汚染モニタ。[Scope of Claims] A body surface contamination monitor that measures the radiation dose from the body to be measured, the body surface contamination monitor having a radiation detector placed around the body to be measured to detect radiation from the body to be measured, comprising: a storage device that stores detection efficiency according to the distance of the instrument to the body to be measured, and detects a distance between at least a head detector placed above the body to be measured and the head of the body to be measured; A body surface contamination monitor comprising a position detector and an arithmetic unit that corrects and calculates the radiation dose based on the detection efficiency corresponding to the distance detected by the position detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22949389A JPH0392788A (en) | 1989-09-05 | 1989-09-05 | Body surface pollution monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22949389A JPH0392788A (en) | 1989-09-05 | 1989-09-05 | Body surface pollution monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0392788A true JPH0392788A (en) | 1991-04-17 |
Family
ID=16893031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22949389A Pending JPH0392788A (en) | 1989-09-05 | 1989-09-05 | Body surface pollution monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0392788A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1315004A1 (en) * | 2001-11-27 | 2003-05-28 | British Nuclear Fuels PLC | Method and apparatus for measuring radioactivity |
| EP2594961A3 (en) * | 2011-11-16 | 2017-07-12 | Mirion Technologies (Canberra), Inc. | Surface contamination monitoring system and method |
-
1989
- 1989-09-05 JP JP22949389A patent/JPH0392788A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1315004A1 (en) * | 2001-11-27 | 2003-05-28 | British Nuclear Fuels PLC | Method and apparatus for measuring radioactivity |
| EP2594961A3 (en) * | 2011-11-16 | 2017-07-12 | Mirion Technologies (Canberra), Inc. | Surface contamination monitoring system and method |
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