JPH03261887A - Instrument for measuring radiation of radioactive waste - Google Patents
Instrument for measuring radiation of radioactive wasteInfo
- Publication number
- JPH03261887A JPH03261887A JP6050790A JP6050790A JPH03261887A JP H03261887 A JPH03261887 A JP H03261887A JP 6050790 A JP6050790 A JP 6050790A JP 6050790 A JP6050790 A JP 6050790A JP H03261887 A JPH03261887 A JP H03261887A
- Authority
- JP
- Japan
- Prior art keywords
- radioactive waste
- rays
- radiation
- radiation detector
- measuring box
- 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
- 230000005855 radiation Effects 0.000 title claims abstract description 28
- 239000002901 radioactive waste Substances 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 230000006837 decompression Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 3
- 238000011896 sensitive detection Methods 0.000 abstract 1
- 230000005250 beta ray Effects 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000005260 alpha ray Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は原子力発電所等から発生する各種形状の雑固体
廃棄物の放射能汚染量の自動測定に適する放射性廃棄物
の放射線測定装置に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a radioactive waste radiation measuring device suitable for automatically measuring the amount of radioactive contamination of miscellaneous solid waste of various shapes generated from nuclear power plants, etc. It is.
（従来の技術〉
従来、放射性廃棄物の放射線測定にはサーベイメータが
一般的に使用されている。ところが放射性廃棄物に付着
していると考えられる放射性核種（ｔ３Ｊ、２ｆｆｉ９
ｐｕ等）から放射されるα線のエネルギーは４〜５ Ｍ
ｅＶであることが多く、その空気中の飛程は数ｃｍ程度
にすぎない。このためにα線の測定のためにはサーベイ
メータを放射性廃棄物に密着させる必要があり、雑固体
廃棄物のような種々の形状の放射性廃棄物については自
動測定が困難で、人手によりサーベイメータを放射性廃
棄物に密着させて測定しなければならなかった。(Conventional technology) Conventionally, survey meters have been generally used to measure the radiation of radioactive waste.However, radionuclides (t3J, 2ffi9
The energy of alpha rays emitted from
It is often eV, and its range in air is only about a few cm. For this reason, in order to measure alpha rays, it is necessary to place the survey meter in close contact with the radioactive waste, and it is difficult to automatically measure radioactive waste of various shapes such as miscellaneous solid waste, so it is necessary to manually measure the radioactive waste with the survey meter. Measurements had to be made in close contact with the waste.
またβ線の測定については、空気によりβ線の吸収率が
最大β線エネルギーによって大きく変化するため、検出
精度の低下を招いていた。例えば、２．２８ ＭｅＶ
という比較的大きな最大β線エネルギーを持つ９０ｙの
β線は、サーベイメータを２０ｃｍ難ずと感度は真空中
の８６％となるのに対して、最大β線エネルギーが０．
１５６ ＭｅＶであるＩ４Ｃのβ線ではサーベイメータ
を２０ｃ＋５ｉｌｔすと感度は真空中の３．６％にまで
低下してしまい、感度のよい測定が不可能であった。Furthermore, in the measurement of β-rays, the absorption rate of β-rays changes greatly depending on the maximum β-ray energy due to the atmosphere, leading to a decrease in detection accuracy. For example, 2.28 MeV
The 90y β-ray has a relatively large maximum β-ray energy, and the sensitivity is 86% of that in a vacuum when the survey meter is placed within 20 cm, whereas the maximum β-ray energy is 0.
For the I4C beta ray, which is 156 MeV, when the survey meter was set at 20c+5ilt, the sensitivity decreased to 3.6% of that in a vacuum, making it impossible to perform sensitive measurements.
（発明が解決しようとする課題）
本発明は上記したような従来の問題を解決して、放射性
廃棄物に密着させることなくα線を測定することができ
、またβ線を高感度で測定することができ、これにより
種々な形状の放射性廃棄物についても放射能汚染量の自
動測定を可能とした放射性廃棄物の放射線測定装置を提
供するために完成されたものである。(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and can measure alpha rays without coming into close contact with radioactive waste, and can also measure beta rays with high sensitivity. The present invention was completed in order to provide a radioactive waste radiation measuring device that can automatically measure the amount of radioactive contamination even in various shapes of radioactive waste.
（課題を解決するための手段）
上記の課題を解決するためになされた本発明は、放射性
廃棄物を収納するための密閉構造の測定ボックスの内部
にα線とβ線の一方又は双方を検出できる放射線検出器
を設けるとともに、この測定ボックスにその内部を０．
１気圧以下まで減圧できる減圧装置を接続したことを特
徴とするものである。(Means for Solving the Problems) The present invention, which was made to solve the above problems, detects one or both of alpha rays and beta rays inside a measurement box with a sealed structure for storing radioactive waste. This measurement box is equipped with a radiation detector that can be used to detect radiation, and the interior of the measurement box is set to 0.
It is characterized by being connected to a pressure reducing device that can reduce the pressure to 1 atmosphere or less.
（実施例） 以下に本発明を図面を参照しつつ更に詳細に説明する。(Example) The present invention will be explained in more detail below with reference to the drawings.
（１）は測定対象である放射性廃棄物、（２）はこの放
ｉ、を性廃棄物（１）を収納するための測定ボックスで
ある。測定ボックス（２）は種々な形状の放射性廃棄物
（１）を内部に収納できるサイズのものであり、出し入
れのための開閉蓋を備えたものであるが、その全体は密
閉構造とされている。(1) is the radioactive waste to be measured, and (2) is a measurement box for storing the radioactive waste (1). The measurement box (2) is sized to accommodate various shapes of radioactive waste (1) inside, and is equipped with an opening/closing lid for loading and unloading, but the entire structure is airtight. .
この測定ボックス（２）には真空ポンプのような減圧装
置（３）が接続され、測定ボックス（２）の内部を少な
くとも０．１気圧まで減圧する。この減圧によってα線
の飛程を増加させることができ、測定ボックス（２）の
現実的なサイズを考慮すると減圧の程度は０．１気圧以
下とすることが必要である。減圧の方法は特に限定され
るものではないが、排出された空気中の放射性物質の飛
散防止手段は必須である。A pressure reducing device (3) such as a vacuum pump is connected to the measuring box (2) to reduce the pressure inside the measuring box (2) to at least 0.1 atmosphere. This reduced pressure can increase the range of α rays, and considering the practical size of the measurement box (2), the degree of reduced pressure needs to be 0.1 atm or less. The method of reducing the pressure is not particularly limited, but means to prevent scattering of radioactive substances in the discharged air is essential.
測定ボックス（２）の内部には放射線検出器（４）が取
付けられており、放射性廃棄物（１）の放射線量を測定
する。この放射線検出器（４）としてはα線又β線のい
ずれかのみを測定できるものを用いてもよいが、α線と
β線の両方を検出できるシンチレーションカウンタ又は
ガスフローカウンタを用いることが好ましい。また放射
線検出器（４）は全立体角をカバーできるように設ける
ことが好ましい。A radiation detector (4) is installed inside the measurement box (2) to measure the radiation dose of the radioactive waste (1). As this radiation detector (4), one that can measure only alpha rays or beta rays may be used, but it is preferable to use a scintillation counter or gas flow counter that can detect both alpha rays and beta rays. . Further, it is preferable that the radiation detector (4) is provided so as to cover the entire solid angle.
（作用）
このように槽底された本発明の放射性廃棄物の放射線測
定装置は、測定対象となる放射性廃棄物（１）を測定ボ
ックス（２）の内部に収納したうえ減圧装置（３）によ
ってその内部を減圧し、測定ボックス（２）の内部に取
付けられた放射線検出器（４）でα線とβ線の一方また
は双方を測定する。このような減圧を行えばα線の飛程
が増大し、例えば０．１気圧に減圧すればα線の飛程は
大気圧中の１０倍程度に達する。またβ線についても減
圧によって吸収率が減少し、放射線検出器（４）により
高感度で検出が可能となる。(Function) The radioactive waste radiation measurement device of the present invention, which is placed at the bottom of the tank, stores the radioactive waste (1) to be measured inside the measurement box (2) and then uses the decompression device (3) to The inside of the box is depressurized, and one or both of alpha rays and beta rays is measured with a radiation detector (4) installed inside the measurement box (2). By reducing the pressure in this way, the range of α-rays increases; for example, if the pressure is reduced to 0.1 atmosphere, the range of α-rays reaches about 10 times that at atmospheric pressure. The absorption rate of β-rays also decreases due to the reduced pressure, and the radiation detector (4) can detect them with high sensitivity.
本発明の効果を確認するため、１００ ｍｍＸ１００
ａｍ×５ｍｓの鉄板に２４１＾−２００Ｂｑ 、 ”Ｃ
２０００Ｂｑ を塗布したサンプルを作威し、測定ボ
ックス（２）の内部に収納した。このときサンプルと放
射線検出Ｈ（４）であるシンチレーションカウンタとの
距離を２０Ｃ１とし、まず減圧前の状態でα線とβ線の
計数率を測定したところ、α線は０ｃｐＳ、β線はＱ、
ｌ ｃｐｓであった。しかし内部を０．１気圧まで減圧
したところα線はｌｃρＳ、β線は２ｃｐｓとなり、い
ずれについても高感度の検出ができた。In order to confirm the effect of the present invention, 100 mm x 100
241^-200Bq on an am x 5ms iron plate, ”C
A sample coated with 2000 Bq was prepared and placed inside the measurement box (2). At this time, the distance between the sample and the scintillation counter that is the radiation detection H (4) was set to 20C1, and the counting rate of α and β rays was measured before depressurization.The α ray was 0 cpS, the β ray was Q,
l cps. However, when the internal pressure was reduced to 0.1 atm, the α-rays were lcρS and the β-rays were 2 cps, making it possible to detect both with high sensitivity.
（発明の効果）
本発明は以上に説明したとおり、放射性廃棄物に検出器
を密着させずにα線を測定することができ、またβ線に
対する検出感度を上げることができる。このように本発
明によれば検出器を密着させる必要がないので様々な形
状の雑固体廃棄物のような放射性廃棄物の放射線測定を
自動的に行うことができるうえ、α線とβ線を同時に感
度良く測定することもできる。更に本発明によれば、従
来のサーベイメータでは測定が困難であった１Ｃのよう
な低エネルギーβ線放射体についても容易に測定するこ
とができる。(Effects of the Invention) As described above, the present invention can measure alpha rays without bringing the detector into close contact with radioactive waste, and can increase the detection sensitivity for beta rays. In this way, according to the present invention, since there is no need to place the detector in close contact with each other, it is possible to automatically measure the radiation of radioactive waste such as miscellaneous solid waste of various shapes. At the same time, it is also possible to measure with high sensitivity. Further, according to the present invention, it is possible to easily measure low-energy β-ray emitters such as 1C, which have been difficult to measure with conventional survey meters.
よって本発明は従来の問題点を一掃した放つ・１性廃棄
物の放射線測定装置として、産業の発展に寄与するとこ
ろは極めて大である。Therefore, the present invention greatly contributes to the development of industry as a radiation measuring device for emitted monochromatic waste that eliminates the problems of the conventional methods.
図面は本発明の実施例を示す断面図である。
（１）：放射性廃棄物、（２）：測定ボックス、（３）
二減圧装置、（４）：放射線検出器。The drawings are cross-sectional views showing embodiments of the present invention. (1): Radioactive waste, (2): Measurement box, (3)
Two pressure reducing devices, (4): radiation detector.
Claims (1)
定ボックス（２）の内部にα線とβ線の一方又は双方を
検出できる放射線検出器（４）を設けるとともに、この
測定ボックス（２）にその内部を０．１気圧以下まで減
圧できる減圧装置（３）を接続したことを特徴とする放
射性廃棄物の放射線測定装置。 ２、放射線検出器（４）がシンチレーションカウンタ又
はガスフローカウンタである請求項１記載の放射性廃棄
物の放射線測定装置。[Claims] 1. A radiation detector (4) capable of detecting one or both of α-rays and β-rays is provided inside a measurement box (2) with a sealed structure for storing radioactive waste (1). A radioactive waste radiation measuring device characterized in that a pressure reducing device (3) capable of reducing the pressure inside the measuring box (2) to 0.1 atmosphere or less is connected to the measuring box (2). 2. The radioactive waste radiation measuring device according to claim 1, wherein the radiation detector (4) is a scintillation counter or a gas flow counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6050790A JPH03261887A (en) | 1990-03-12 | 1990-03-12 | Instrument for measuring radiation of radioactive waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6050790A JPH03261887A (en) | 1990-03-12 | 1990-03-12 | Instrument for measuring radiation of radioactive waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03261887A true JPH03261887A (en) | 1991-11-21 |
Family
ID=13144293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6050790A Pending JPH03261887A (en) | 1990-03-12 | 1990-03-12 | Instrument for measuring radiation of radioactive waste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03261887A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151780A (en) * | 1985-12-26 | 1987-07-06 | Aloka Co Ltd | Radiation contamination detecting device |
-
1990
- 1990-03-12 JP JP6050790A patent/JPH03261887A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151780A (en) * | 1985-12-26 | 1987-07-06 | Aloka Co Ltd | Radiation contamination detecting device |
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