JPS5999397A - Method of attenuating leaked radiation - Google Patents
Method of attenuating leaked radiationInfo
- Publication number
- JPS5999397A JPS5999397A JP20995082A JP20995082A JPS5999397A JP S5999397 A JPS5999397 A JP S5999397A JP 20995082 A JP20995082 A JP 20995082A JP 20995082 A JP20995082 A JP 20995082A JP S5999397 A JPS5999397 A JP S5999397A
- Authority
- JP
- Japan
- Prior art keywords
- radiation
- leakage
- path
- bend
- attenuating
- 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
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Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
- Paper (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は漏洩放射線減衰方法に係り、特に放射線遮蔽構
造物中の屈曲ダクト、壁の合わせ目等における漏洩放射
線を減衰させる方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of attenuating leakage radiation, and more particularly to a method of attenuating leakage radiation at bent ducts, wall joints, etc. in a radiation shielding structure.
従来、原子炉格納容器壁、原子炉冷却材用配管。Conventionally, reactor containment vessel walls, reactor coolant piping.
生体遮蔽壁等のように放射線遮蔽性を必要とするいわゆ
る放射線遮蔽構造物には、屈曲ダクトが存在したり工作
上あるいは組立上の要求から、例えば第1図に示すよう
に構造物の壁IA、IBを組み合わせた合わせ目2が設
けられる。この合わせ目2に間隙があると、放射線漏洩
通路8が形成されるため、これを屈曲させて放射線の漏
洩量を減少させる如くしている。So-called radiation shielding structures that require radiation shielding properties, such as biological shielding walls, have bent ducts, and due to construction or assembly requirements, for example, as shown in Fig. 1, the structure wall IA , IB is provided. If there is a gap in this seam 2, a radiation leakage path 8 is formed, so this is bent to reduce the amount of radiation leakage.
ところで、放射線のうち、中性子、r線等は物質を突き
抜ける力が大きいため、壁IA、IBを構成する物質の
原子核の中に自由に入り込む。そして、原子核に衝突す
ることにより進行方向を変える弾性散乱などによって次
第に減速する現象を繰り返えす。By the way, among radiation, neutrons, r-rays, etc. have a large power to penetrate materials, and therefore freely enter into the atomic nuclei of the materials forming the walls IA and IB. Then, the phenomenon of gradual deceleration due to elastic scattering, which changes the direction of travel by colliding with the atomic nucleus, is repeated.
したがって、屈曲ダクトや合わせ目等の放射線漏洩通路
8の屈曲部付近で第2図に鎖線で示すように、放射線漏
洩現象が発生する可能性P有する。Therefore, there is a possibility P that a radiation leakage phenomenon will occur near the bent portion of the radiation leakage passage 8 such as a bent duct or joint, as shown by the chain line in FIG.
すなわち、放射線漏洩通路8の屈曲部内角付近で壁IA
内に入り込んだ、放・射IIi!4Aは、平均自由行程
(中性子のエネルギや壁の材質によって異なる)X程度
を通過した後、点凡の位置で散乱して放射線漏洩通路8
に入り、壁IAjIBの外方に鎖線4Bで示す如く漏洩
する。また、放射線漏洩通路8に沿って屈曲部に入った
放射線5Aがあると、平均自由行程程度に達した点Sの
位置で散乱して、放射線が鎖i5Bの方向に飛び出すと
すれば、放射線漏洩通路3に沿って外方に漏洩する。ざ
らに、放射線漏洩通路8の屈曲部外角付近で壁IBに入
り込んだ放射i6Aは、通路近傍の点Tの位置で散乱し
て、放射線漏洩通路8に沿って鎖線6Bで示すように外
方に飛び出す。That is, near the inner corner of the bending part of the radiation leakage passage 8, the wall IA
Radiation IIi has entered inside! After passing through a mean free path of approximately X (which varies depending on the energy of the neutron and the material of the wall), the radiation 4A is scattered at random points and enters the radiation leakage path 8.
and leaks outside the wall IAjIB as shown by the chain line 4B. Furthermore, if there is radiation 5A that has entered the bend along the radiation leakage path 8, it will be scattered at the position of point S, which has reached the mean free path, and the radiation will fly out in the direction of chain i5B. It leaks outward along the passageway 3. Roughly speaking, the radiation i6A that has entered the wall IB near the outside corner of the bend of the radiation leakage path 8 is scattered at a point T near the path, and is directed outward along the radiation leakage path 8 as shown by the chain line 6B. Jump out.
これらの漏洩現象は第2図に点R,S、Tで示すように
、屈曲部近傍で散乱が起きることに起因するものである
。These leakage phenomena are caused by scattering occurring near the bends, as shown by points R, S, and T in FIG.
これを解決する一方法として、放射線遮蔽構造物に形成
される放射線漏洩通路の屈曲回数を増すことも考えられ
るが、構造が複雑化して高精度の加工が要求されるとい
う問題がある。One possible solution to this problem is to increase the number of bends in the radiation leakage path formed in the radiation shielding structure, but this poses a problem of complicating the structure and requiring highly accurate machining.
本発明は、前記事情に基づいてなされたもので、その目
的とするところは、放射線漏洩通路の屈曲部近傍の遮蔽
体中では放射線の散乱現象を回避し、多数回の散乱の結
果でしか放射線を通過させないようになし、放射線の漏
洩を著しく減少させることができ、また、各種の放射線
遮蔽構造物に容易に適用し得る方法を提供することにあ
る。The present invention has been made based on the above-mentioned circumstances, and its purpose is to avoid the scattering phenomenon of radiation in the shielding body near the bend of the radiation leakage path, and to avoid the radiation scattering phenomenon that occurs only as a result of multiple scattering. It is an object of the present invention to provide a method that can significantly reduce radiation leakage by preventing radiation from passing through, and can be easily applied to various radiation shielding structures.
この目的を達成するため、本発明は放射線遮蔽構造物中
の屈曲ダクトや合わせ目等に形成される屈曲した放射線
漏洩通路の該屈曲部を放射線平均自由行程より若干大き
な寸法で、各放射線漏洩通路の周囲へ拡張し、放射線を
屈曲部近傍では散乱させないことを特徴とするものであ
る。In order to achieve this object, the present invention provides a structure in which each radiation leakage path has a bent portion with a dimension slightly larger than the radiation mean free path, which is formed at a bent duct, joint, etc. in a radiation shielding structure. It is characterized by the fact that it expands around the curve and does not scatter radiation near the bend.
以下、本発明の一実施例を第3図に基づいて説明する。Hereinafter, one embodiment of the present invention will be described based on FIG. 3.
第3図では、放射線漏洩通路8の屈曲部に屈曲部を大き
く包み込む空間部もしくは拡張孔7が設けられている。In FIG. 3, a space or an expansion hole 7 is provided at the bend of the radiation leakage passage 8 to largely enclose the bend.
この空間部7は第3図に示すように、屈曲部を放射線漏
洩通路8の両方向に削り取って例えば平行六面体や断面
四角形の空間となるように形成される。As shown in FIG. 3, this space 7 is formed by cutting off the bent portion in both directions of the radiation leakage passage 8 to form a space having, for example, a parallelepiped or square cross section.
この理由について以下説明する。例えば、放射線漏洩通
路8に沿って空間部7に進んだ放射線5Aであると、孔
内壁8Aに入り込んで平均自由行程程度の深さにある点
S1で、第1回の散乱を起こす。第2図の場合と同様に
鎖線5Bで示すように放射線が進行したとすれば、点S
2で第2回の散乱を起こす。この散乱によって発生した
放射線の方向がtam5cで示す方向であると点S8で
第3回の散乱を起こし鎖M5Dで示す方向の放射線が、
放射1m通路8に沿って進行して外方に飛び出す。The reason for this will be explained below. For example, the radiation 5A that has proceeded into the space 7 along the radiation leakage path 8 enters the hole inner wall 8A and causes first scattering at a point S1 at a depth of approximately the mean free path. As in the case of Fig. 2, if the radiation progresses as shown by the chain line 5B, then the point S
2 causes the second scattering. If the direction of the radiation generated by this scattering is the direction shown by tam5c, the third scattering occurs at point S8, and the radiation in the direction shown by chain M5D is
It advances along the radiation 1m path 8 and jumps out.
これら3回の散乱によって放射線のエネルギは減衰し、
また、壁IA、IBから飛び出す放射線量も極度に少な
くなる。The energy of the radiation is attenuated by these three scatterings,
Furthermore, the amount of radiation emitted from the walls IA and IB is also extremely reduced.
ざらに、屈曲部の内角に向かって進行してきた放射線4
Aは、空間部7があるため空間を通って直進し、孔内壁
8Aに人って平均自由工程X程度を通過した点凡の位置
で散乱する。しかしながら点凡の位置は、拡張寸法Yの
分だけ放射線漏洩通路8から離れており、放射線漏洩通
路8に到達して外方に直接飛び出すことがほとんどなく
、飛び出すにはさらに数回以上の散乱を必要とする。ま
た、屈曲部の外角に向かって進行してきた放射線6人も
点Tで分散するため同様の傾向を示す。Radiation 4 that roughly progressed toward the inner corner of the bend
Since the space 7 exists, the light A travels straight through the space, and is scattered at a point where the light passes through the mean free path X on the inner wall 8A of the hole. However, the position of the dotbo is away from the radiation leakage path 8 by the expansion dimension Y, so it almost never reaches the radiation leakage path 8 and directly jumps out, and it takes several more scatterings to jump out. I need. Furthermore, the six radiation beams that have proceeded toward the outer corner of the bend also disperse at point T, so they exhibit a similar tendency.
このよう5、放射線漏洩通路8の屈曲部に空間部7を設
けておくと、屈曲部の付近における放射線の散乱作用が
漏洩通路3の近傍では起こらず、かつ、1回だけの散乱
現象で放射線が放射線漏洩通路8に沿って飛び出すこと
がほとんどなく、散乱のたびにエネルギが減衰し、しか
も、外方に飛び出すMiも少なぐなるものである。In this way, if the space 7 is provided at the bend of the radiation leakage path 8, the radiation scattering effect near the bend will not occur in the vicinity of the leakage path 3, and the radiation will be scattered by only one scattering phenomenon. Mi hardly jumps out along the radiation leakage path 8, the energy is attenuated each time it is scattered, and moreover, the amount of Mi that jumps out is also reduced.
なお、ここまで説明した一実施例では、屈曲部を平行六
面体や四角形の断面をもつように拡張する例について述
べたが、球形や回転楕円体もしくは断面が円形、楕円形
、多角形などの他、非幾何学的形状になるような空間部
としてもよい。In the embodiment described so far, an example has been described in which the bent portion is expanded to have a parallelepiped or quadrilateral cross section, but other shapes such as a sphere, a spheroid, a circular cross section, an ellipse, a polygon, etc. are described. , the space may have a non-geometric shape.
本発明は以上説明したように、放射線遮蔽構造物屈曲ダ
クトや壁の合わせ目等に形成される放射線漏洩通路の屈
曲部を拡張させるという新規な発想により、放射線を屈
曲部近傍で散乱させず、屈曲部をへた次の通路にいく際
には数回の散乱を必要とさせ放射線のエネルギ減衰を促
進するようGこするとともに、線量を低減することが容
易であるから、原子力発電施設の安全性を向上させるこ
とができるなどの効果を奏するものである。As explained above, the present invention utilizes a novel idea of expanding the bending part of the radiation leakage passage formed at the bending duct of the radiation shielding structure or the seam of the wall, thereby preventing radiation from being scattered near the bending part. When going to the next passage after turning a bend, several scatterings are required to promote the energy attenuation of the radiation, and it is easy to reduce the dose, which improves the safety of nuclear power generation facilities. This has effects such as improving sexual performance.
第1図は従来の放射線遮蔽壁に設けられたダクトや合わ
せ目の構造例を示す断面図、第2図は第1図の放射線漏
洩現象を説明する拡大図、第3図番ま本発明の一実施例
の説明する拡大図である。
IA、IB・・・・・・壁、2・・・・・・合わせ目、
8・・・・・・放射線漏洩通路、7・・・・・・空間部
。Fig. 1 is a cross-sectional view showing an example of the structure of a duct and a seam provided in a conventional radiation shielding wall, Fig. 2 is an enlarged view illustrating the radiation leakage phenomenon of Fig. 1, and Fig. It is an enlarged view explaining one example. IA, IB...wall, 2...joint,
8...Radiation leakage passage, 7...Space part.
Claims (1)
形成される放射線漏洩通路q)屈曲部を放射線平均自由
行程により若干大きな寸法で、各放射線漏洩通路の両方
向へ拡張し、放射線を屈曲部近傍で散乱させないように
したことを特徴とする漏洩放射線減衰方法。Radiation leakage paths formed at bent ducts and wall joints in radiation shielding structures q) Expand each radiation leakage path in both directions with a slightly larger dimension due to the mean free path of the radiation at the bent portion to bend the radiation. A method of attenuating leakage radiation characterized by preventing scattering in the vicinity of the leakage radiation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20995082A JPS5999397A (en) | 1982-11-30 | 1982-11-30 | Method of attenuating leaked radiation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20995082A JPS5999397A (en) | 1982-11-30 | 1982-11-30 | Method of attenuating leaked radiation |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5999397A true JPS5999397A (en) | 1984-06-08 |
Family
ID=16581347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20995082A Pending JPS5999397A (en) | 1982-11-30 | 1982-11-30 | Method of attenuating leaked radiation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5999397A (en) |
-
1982
- 1982-11-30 JP JP20995082A patent/JPS5999397A/en active Pending
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