JPH0534462A - Device for discriminating between contamination and activation - Google Patents
Device for discriminating between contamination and activationInfo
- Publication number
- JPH0534462A JPH0534462A JP19004091A JP19004091A JPH0534462A JP H0534462 A JPH0534462 A JP H0534462A JP 19004091 A JP19004091 A JP 19004091A JP 19004091 A JP19004091 A JP 19004091A JP H0534462 A JPH0534462 A JP H0534462A
- Authority
- JP
- Japan
- Prior art keywords
- rays
- measured
- ray
- contamination
- ray detector
- 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
Landscapes
- Measurement Of Radiation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は放射能による汚染物と放
射化物の識別を行うことができる識別装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discrimination device capable of discriminating radioactive contaminants from radioactive substances.
【０００２】[0002]
【従来の技術】放射性物質取扱施設の管理区域内の物品
を持ち出す時には、サーベメータにより前記物品の汚染
検査を行う。前記物品が汚染されていた場合には、これ
に十分な除染を施した後再び汚染サーベメータにより測
定し、反応があればそれは放射化物であり、なければ汚
染物であると識別している。2. Description of the Related Art When an article in a controlled area of a radioactive substance handling facility is taken out, a contamination meter is used to inspect the article. When the article is contaminated, it is sufficiently decontaminated and then measured again by a contamination survey meter. If there is a reaction, it is identified as a radioactive substance, and if not, it is identified as a contaminant.
【０００３】[0003]
【発明が解決しようとする課題】上記のような識別手段
においては、汚染物、放射化物の識別を行うのに、測
定、除染、再測定の手順を踏まなければならない。これ
は対象物が小形の工具のようなものである場合には比較
的容易に実施することができるが、例えば老朽化した原
子炉の解体時に発生する大量の廃棄物の識別を行うには
問題がある。すなわち、除染、再測定を施すことは極め
て非効率であるだけでなく、識別に携わる作業員の放射
線被爆量も増大する。In the above-mentioned identification means, the steps of measurement, decontamination, and re-measurement must be performed in order to identify contaminants and radioactive materials. This can be done relatively easily if the object is something like a small tool, but it is problematic to identify the large amount of waste generated during the dismantling of an aged reactor, for example. There is. That is, not only is decontamination and remeasurement extremely inefficient, but the radiation exposure dose of workers involved in identification is also increased.
【０００４】本発明は上記の事情に基づきなされたもの
で、高効率でしかも作業員の放射線被爆量を最小限とし
て汚染／放射化放射能の識別をなし得る識別装置を提供
する。The present invention has been made in view of the above circumstances, and provides a discrimination device capable of discriminating contamination / activated radioactivity with high efficiency and minimizing the radiation exposure of workers.
【０００５】[0005]
【課題を解決するための手段】本発明の汚染／放射化放
射能識別装置は、β線測定手段と、γ線測定手段と、前
記β線測定手段にて測定されたβ線の測定値と前記γ線
測定手段にて測定されたγ線の測定値との比較によって
放射性廃棄物が汚染物か放射化物かを識別する汚染／放
射化物識別手段とを具備して成ることを特徴とする。Means for Solving the Problems A contamination / activating radioactivity discriminating apparatus of the present invention comprises a β ray measuring means, a γ ray measuring means, and a β ray measured value measured by the β ray measuring means. It is characterized by comprising contamination / radiation product identification means for identifying whether the radioactive waste is a contaminant or a radioactive product by comparison with the measurement value of the γ-ray measured by the γ-ray measurement device.
【０００６】[0006]
【作用】上記構成の本発明の汚染／放射化放射能識別装
置においては、測定対象物が汚染物であった場合には、
汚染面からのβ線は前記β線検出器により検出され、γ
線はγ線検出器によって検出される。測定対象物の前記
汚染面とは反対側の面の測定を行った場合には、汚染面
からのβ線は測定対象物自体に遮られβ線検出器で測定
されないが、物質透過能力の大きなγ線は測定対象物に
遮られることなくγ線検出器において測定される。In the contamination / activatable radioactivity discrimination device of the present invention having the above-mentioned structure, when the object to be measured is a contaminant,
Β rays from the contaminated surface are detected by the β ray detector,
The rays are detected by a gamma ray detector. When the surface of the measuring object opposite to the contaminated surface is measured, the β ray from the contaminated surface is blocked by the measuring object itself and cannot be measured by the β ray detector, but the mass transmission ability is large. The γ-ray is measured by the γ-ray detector without being blocked by the measurement object.
【０００７】従って、前記汚染物の場合汚染面における
β線／γ線計数率比と反対側の面のそれとの間には、顕
著な差を生じる。測定対象物が放射化物である場合に
は、どの面の測定を行ってもβ線／γ線計数率比に差を
生じることはない。Therefore, in the case of the above-mentioned contaminant, a significant difference occurs between the β-ray / γ-ray count rate ratio on the contaminated surface and that on the opposite surface. When the object to be measured is a radioactive substance, no difference occurs in the β-ray / γ-ray count rate ratio no matter which surface is measured.
【０００８】本発明においてはこれを利用して汚染／放
射化物識別手段によって識別を行うものである。In the present invention, this is utilized to identify by the contamination / radiation product identification means.
【０００９】[0009]
【実施例】図１は本発明一実施例の全体構成を示す模式
図、図２Ａは前記実施例による測定態様を示す模式図、
図２Ｂは測定原理を説明するための線図である。図１に
おいて、γ線検出器１を上段に、β線検出器２を下段に
して構成された測定ヘッドＨの各検出器１、２の出力
は、信号処理手段１０、１０を経由して汚染／放射化物
識別手段である計算機１１に入力されている。図中３は
測定対象物を示している。EXAMPLE FIG. 1 is a schematic diagram showing the overall structure of an example of the present invention, and FIG. 2A is a schematic diagram showing the measurement mode according to the example,
FIG. 2B is a diagram for explaining the measurement principle. In FIG. 1, the outputs of the detectors 1 and 2 of the measuring head H configured with the γ-ray detector 1 in the upper stage and the β-ray detector 2 in the lower stage are contaminated via the signal processing means 10 and 10. / It is input to the computer 11, which is a means for discriminating activated compounds. Reference numeral 3 in the figure denotes a measurement object.
【００１０】上記構成の実施例において、汚染／放射化
放射能の識別は次のようにしてなされる。すなわち、測
定対象物３が汚染物でありその汚染面が前記測定ヘッド
Ｈに正面対向しているとして、図２Ｂはβ線検出器２に
検出されたβ線４（図２Ａ）の計数率およびγ線検出器
１により検出されたγ線５（図２Ａ）の計数率の比を縦
軸にとり、汚染面の面積を横軸にとってそれら両者間の
関係を示す線図で、前記両者間の関係はこの図の曲線６
で示されている。In the embodiment having the above-mentioned structure, the contamination / activation radioactivity is identified as follows. That is, assuming that the measurement object 3 is a contaminant and its contaminated surface faces the measurement head H in front, FIG. 2B shows the count rate of β rays 4 (FIG. 2A) detected by the β ray detector 2 and FIG. 2 is a diagram showing the relationship between the γ-rays 5 (FIG. 2A) detected by the γ-ray detector 1 on the vertical axis and the area of the contaminated surface on the horizontal axis. Is curve 6 in this figure
Indicated by.
【００１１】また、前記測定対象物３の反対側の面に前
記測定ヘッドＨと同様の構成の測定ヘッドＨａを正面対
向させたとき、これにより得られる前記同様の関係は図
２Ｂに曲線７で示されている。曲線７は曲線６の場合に
比して検出されるβ線の割合が極端に少ないことを示し
ている。When a measuring head Ha having the same structure as that of the measuring head H is made to face the opposite surface of the object 3 to be measured, the same relationship as described above is shown by a curve 7 in FIG. 2B. It is shown. Curve 7 shows that the proportion of β rays detected is extremely small compared to the case of curve 6.
【００１２】なお、図２Ｂから測定対象物３の汚染面の
面積が変化してもβ線／γ線の計数率比に大きな変化は
見られないことがわかる。From FIG. 2B, it can be seen that even if the area of the contaminated surface of the object 3 to be measured changes, the β / γ ray count rate ratio does not change significantly.
【００１３】図３は測定対象物が放射化物である場合の
測定態様を示す模式図である。この図において、測定ヘ
ッドＨのβ線検出器２により検出されたβ線４の計数率
およびγ線検出器１により検出されたγ線５の計数率の
比と、測定ヘッドＨａのβ線検出器２ａにより検出され
たβ線４の計数率の比は、図２Ｂにおいて説明したよう
に面積が変化してもβ線／γ線計数率比に変化が見られ
ないところから、放射化物を測定したときそのどの面の
測定を行っても大きく変化することはない。FIG. 3 is a schematic diagram showing a measurement mode when the object to be measured is a radioactive substance. In this figure, the ratio of the counting rate of β rays 4 detected by the β ray detector 2 of the measuring head H and the counting rate of γ rays 5 detected by the γ ray detector 1 to the β ray detection of the measuring head Ha. The ratio of the counting rates of β rays 4 detected by the instrument 2a was measured from the fact that no change was observed in the β ray / γ ray counting rate ratio even if the area was changed as described in FIG. 2B. When the measurement is performed, the measurement does not change much on any surface.
【００１４】これ等のことから、測定対象物３の汚染面
のβ線検出器２とγ線検出器１それぞれのβ線４、γ線
５の計数率の比と、反対側の面に正面対向する測定ヘッ
ドＨａのβ線検出器２ａとγ線検出器１ａそれぞれのβ
線４、γ線５の計数率の比との比率を弁別指標としたと
き、図４は前記弁別指標を縦軸にとり、厚みの異なる測
定対象物３の汚染部の放射能と放射化部の放射能との割
合（０に近付くほど完全な放射化物に近付く）を横軸に
とって、それら両者間の関係を示す線図である。この図
から、測定対象物３の汚染部の割合が増加するにつれ
て、汚染物と放射化物の弁別指標は約１から約１８に増
加することがわかり、特に汚染部の放射能と放射化部の
放射能との比が約０．１から約１０までの領域での変化
が顕著であるため、汚染物と放射化物との識別性がよ
い。これにより、汚染／放射化放射能の識別が可能であ
る。From these facts, the ratio of the counting rates of the β rays 4 and the γ rays 5 of the β ray detector 2 and the γ ray detector 1 on the contaminated surface of the object 3 to be measured and the front side on the opposite side. Β of each of the β-ray detector 2a and the γ-ray detector 1a of the measuring head Ha facing each other
When the ratio of the ratio of the counting rates of the rays 4 and the γ-rays 5 is used as a discrimination index, in FIG. 4, the discrimination index is plotted on the vertical axis, and the radioactivity of the contaminated part and the activation part of the measurement object 3 having different thicknesses are shown. FIG. 3 is a diagram showing the relationship between radioactivity and the ratio (the closer to 0, the closer to a complete radioactive material) on the horizontal axis. From this figure, it can be seen that as the ratio of the contaminated part of the measurement object 3 increases, the discrimination index between the contaminated part and the radioactive material increases from about 1 to about 18, and particularly the radioactivity of the contaminated part and the activation part Since the change in the ratio of radioactivity to the range of about 0.1 to about 10 is remarkable, the contaminant and the radioactive substance can be easily distinguished. This makes it possible to distinguish between contamination / activated radioactivity.
【００１５】上記から明らかなように、本発明によれば
図２Ａに示すように測定対象物３を挟んで測定ヘッド
Ｈ、Ｈａを対称的に配置して測定を行うことにより、測
定対象物３に除染を施すことなく汚染／放射化放射能の
識別を行うことができる。As is apparent from the above, according to the present invention, as shown in FIG. 2A, the measuring heads H and Ha are symmetrically arranged with the object to be measured 3 sandwiched therebetween, and the object to be measured 3 is measured. It is possible to identify contamination / radioactive radioactivity without decontamination.
【００１６】なお、本発明は上記説明した実施例のみに
限定されない。上記実施例は老朽化した原子炉の解体時
に生じる大量の廃棄物の識別につき本発明を適用したも
のであるが、放射線取扱施設の管理区域の軽微な改造に
伴う比較的少量の廃棄物の識別に適用してもよい。The present invention is not limited to the embodiment described above. Although the above-mentioned embodiment is one in which the present invention is applied to the identification of a large amount of waste generated at the time of dismantling an aged reactor, the identification of a relatively small amount of waste due to a slight modification of the control area of the radiation handling facility. May be applied to.
【００１７】図５は上記のような少量の廃棄物の識別に
使用するに適した他の実施例の模式的斜視図である。こ
の図において、測定対象物３にはγ線汚染検査サーベメ
ータ８およびβ線汚染検査サーベメータ９が対向されて
いる。また、測定対象物３は図示しない手段により反転
されるようにしてある。前記各サーベメータ８、９の測
定対象物３の各面の計数率を計算機１１に入力して必要
な演算を行わせ、その結果を表示させる。このようにし
て測定対象物３の汚染／放射化放射能の識別を行うこと
ができる。測定対象物３を反転させたりしなければなら
ないので、前記実施例のように大量の廃棄物の識別に使
用するには適しないが、少量の廃棄物の識別には十分対
処することができる。FIG. 5 is a schematic perspective view of another embodiment suitable for use in identifying a small amount of waste as described above. In this figure, a γ-ray contamination inspection survey meter 8 and a β-ray contamination inspection survey meter 9 face the measurement object 3. Further, the measuring object 3 is adapted to be inverted by means not shown. The count rate of each surface of the measurement object 3 of each of the survey meters 8 and 9 is input to the calculator 11 to perform a necessary calculation, and the result is displayed. In this way, the contamination / activated radioactivity of the measurement object 3 can be identified. Since the measurement object 3 has to be inverted, it is not suitable for use in identifying a large amount of waste as in the above-mentioned embodiment, but it can sufficiently deal with identifying a small amount of waste.
【００１８】図６Ａは本発明のさらに他の実施例の模式
的斜視図、図６Ａはその変形例の同様の斜視図である。
この実施例においては図１に示した実施例と同様の測定
ヘッドＨが１個のみ使用され、図６Ａにおいては測定対
象物３の反転を行わせるようにしてあり、図６Ｂにおい
ては測定ヘッドＨの移動がなされるようにしてある。こ
の実施例においては１台の測定ヘッドにより２台のそれ
を使用した装置と同様に識別を行うことができる。FIG. 6A is a schematic perspective view of still another embodiment of the present invention, and FIG. 6A is a similar perspective view of a modification thereof.
In this embodiment, only one measuring head H similar to that of the embodiment shown in FIG. 1 is used. In FIG. 6A, the measuring object 3 is inverted, and in FIG. 6B, the measuring head H is used. Is made to move. In this embodiment, one measuring head can be used for identification in the same way as two measuring devices using it.
【００１９】[0019]
【発明の効果】上記から明らかなように本発明の装置に
よれば、測定対象物の除染を行ったり再測定を行ったり
することなく、測定対象物が汚染物であるか放射化物で
あるかの識別をなし得るので、作業効率の向上を図るこ
とができる。また、作業員の放射線被爆量を著しく減少
させることができ、作業の安全性を向上させることがで
きる。As is apparent from the above, according to the apparatus of the present invention, the object to be measured is a contaminant or a radioactive substance without decontaminating or re-measuring the object to be measured. Since it can be identified, the work efficiency can be improved. In addition, the radiation exposure of the worker can be significantly reduced, and the work safety can be improved.
【図１】本発明一実施例の全体構成を示す模式図であ
る。FIG. 1 is a schematic diagram showing the overall configuration of an embodiment of the present invention.
【図２】Ａは前記実施例による測定態様を示す模式図、
Ｂは測定原理を説明するための線図である。FIG. 2A is a schematic diagram showing a measurement mode according to the embodiment,
B is a diagram for explaining the measurement principle.
【図３】測定対象物が放射化物である場合の測定態様を
示す模式図である。FIG. 3 is a schematic diagram showing a measurement mode when a measurement target is a radioactive substance.
【図４】弁別指標を縦軸にとり、厚みの異なる測定対象
物の汚染部の放射能と放射化部の放射能との割合を横軸
にとって、それら両者間の関係を示す線図である。FIG. 4 is a diagram showing a relationship between the two, with the vertical axis representing the discrimination index and the horizontal axis representing the ratio of the radioactivity in the contaminated portion and the radioactivity in the activation portion of the measurement objects having different thicknesses.
【図５】少量の廃棄物の識別に使用するに適した他の実
施例の模式的斜視図である。FIG. 5 is a schematic perspective view of another embodiment suitable for use in identifying small amounts of waste.
【図６】Ａは本発明のさらに他の実施例の模式的斜視
図、Ｂはその変形例の同様の斜視図である。FIG. 6A is a schematic perspective view of still another embodiment of the present invention, and B is a similar perspective view of a modification thereof.
１………γ線検出き ２………β線検出器 ３………測定対象物 １０………信号処理手段 １１………計算機 1 ………… γ ray detector 2 ………… β ray detector 3 ………… Measuring object 10 ………… Signal processing means 11 ………… Calculator
Claims (1)
線測定手段にて測定されたβ線の測定値と前記γ線測定
手段にて測定されたγ線の測定値との比較によって放射
性廃棄物が汚染物か放射化物かを識別することを特徴と
する汚染／放射化物識別手段とから成る汚染／放射化放
射能識別装置。Claims: 1. β-ray measuring means, γ-ray measuring means and the β
Characterized in that the radioactive waste is identified as a pollutant or a radioactive substance by comparing the measurement value of β-ray measured by the radiation measuring means and the measurement value of γ-ray measured by the γ-ray measuring means. And a radioactive / radioactive material identification device for identifying a radioactive / radioactive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3190040A JP2736186B2 (en) | 1991-07-30 | 1991-07-30 | Pollution / activation radioactivity identification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3190040A JP2736186B2 (en) | 1991-07-30 | 1991-07-30 | Pollution / activation radioactivity identification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0534462A true JPH0534462A (en) | 1993-02-09 |
| JP2736186B2 JP2736186B2 (en) | 1998-04-02 |
Family
ID=16251363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3190040A Expired - Fee Related JP2736186B2 (en) | 1991-07-30 | 1991-07-30 | Pollution / activation radioactivity identification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2736186B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009500608A (en) * | 2005-07-01 | 2009-01-08 | ウィリアム ケイ ウォーバートン | Detection of simultaneous radiation in a single transducer by pulse waveform analysis |
| JP2015064272A (en) * | 2013-09-25 | 2015-04-09 | 独立行政法人産業技術総合研究所 | Large-solid-angle simultaneous detector of gamma ray and beta ray |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6370186A (en) * | 1986-09-11 | 1988-03-30 | Nippon Atom Ind Group Co Ltd | Radioactive waste selector |
| JPS63308590A (en) * | 1987-06-10 | 1988-12-15 | Nippon Atom Ind Group Co Ltd | Contamination mode discriminating instrument |
-
1991
- 1991-07-30 JP JP3190040A patent/JP2736186B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6370186A (en) * | 1986-09-11 | 1988-03-30 | Nippon Atom Ind Group Co Ltd | Radioactive waste selector |
| JPS63308590A (en) * | 1987-06-10 | 1988-12-15 | Nippon Atom Ind Group Co Ltd | Contamination mode discriminating instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009500608A (en) * | 2005-07-01 | 2009-01-08 | ウィリアム ケイ ウォーバートン | Detection of simultaneous radiation in a single transducer by pulse waveform analysis |
| JP2015064272A (en) * | 2013-09-25 | 2015-04-09 | 独立行政法人産業技術総合研究所 | Large-solid-angle simultaneous detector of gamma ray and beta ray |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2736186B2 (en) | 1998-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6519070B1 (en) | Inspection apparatus for radioactive contamination and inspection method | |
| JPH0534462A (en) | Device for discriminating between contamination and activation | |
| GB2221987A (en) | A process and an apparatus for the continuous determination of gas-borne alpha-activity | |
| JPH0688873A (en) | Method and device for evaluating distribution of radiation dosage rate | |
| JP2736189B2 (en) | Radioactive waste contamination / activation radioactive identification method with openings | |
| US7408161B2 (en) | Investigations | |
| Yokoyama et al. | Development of clearance verification equipment for uranium-bearing waste | |
| JPS61107183A (en) | Method for measuring radioactive quantity of radioactive waste contained in receptacle | |
| JPH04235379A (en) | Measuring method of radioactivity | |
| JP3193665B2 (en) | Method and apparatus for identifying radioactive waste in a container | |
| JPS6061670A (en) | Radiation source detector | |
| JP2563341B2 (en) | Contamination type determination device | |
| JP2565877B2 (en) | Radioactive waste sorter | |
| JP2736184B2 (en) | Radioactivity identification method for radioactive waste | |
| JPH02222855A (en) | Pollution depth discriminator | |
| JPS61213682A (en) | Radiation dose measuring instrument | |
| JP6512649B1 (en) | Measurement method of surface dose rate | |
| Genicot et al. | The assessment of plutonium and americium in contaminated wounds with high energy resolution semiconductor detectors | |
| JPS61161481A (en) | Measuring device of radioactivity | |
| JPH04130290A (en) | Method and device for inspection radioactive waste | |
| EP3329302B1 (en) | Method and apparatus for detecting intrinsic radioactivity of radioactive samples | |
| JPS6345583A (en) | Surface contamination inspecting equipment | |
| GB2428791A (en) | Classifying radioactive waste | |
| Dean et al. | A Comparison of True Alpha Activities in Air Filter Samples with Values Obtained from Radioactivity-in-air Monitors | |
| Schilk et al. | Selective, high-energy beta scintillation sensor for real-time, in situ characterization of uranium-238 and strontium-90 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19971209 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080109 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090109 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100109 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |