JP5404717B2

JP5404717B2 - Radiation shielding plate and radiation shielding box

Info

Publication number: JP5404717B2
Application number: JP2011185202A
Authority: JP
Inventors: 勇治木藤; 武典佃; 起一白石; 和徳佐藤; 春男山田; 久雄新川; 丈嗣加藤; 宏神戸
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2011-08-26
Filing date: 2011-08-26
Publication date: 2014-02-05
Anticipated expiration: 2031-08-26
Also published as: JP2013044730A

Description

本発明は、放射線環境下で作業する作業者を放射線被ばくから防護するために用いられる放射線遮蔽板及び放射線遮蔽箱に関する。 The present invention relates to a radiation shielding plate and a radiation shielding box used for protecting an operator working in a radiation environment from radiation exposure.

従来より、放射線を遮蔽するための手段として鉛を含む放射線遮蔽板が用いられている。例えば、特許文献１には、図２４に示すように、鉛板５１を一対の石綿板５２で挟持し、一方の石綿板５２の外側をＦＲＰ板５４で覆い、他方の石綿板５２の外側をＦＲＰ板５４及びＳＵＳ板５３で覆うサンドイッチ構造の放射線遮蔽板５５を用いた貯留槽５６が開示されている。貯留槽５６の側壁、上壁及び底壁はすべて放射線遮蔽板５５から構成されており、側壁と上壁、側壁と底壁の連結部分においては、鉛板５１がＴ字形に接合されている。 Conventionally, a radiation shielding plate containing lead has been used as a means for shielding radiation. For example, in Patent Document 1, as shown in FIG. 24, a lead plate 51 is sandwiched between a pair of asbestos plates 52, the outside of one asbestos plate 52 is covered with an FRP plate 54, and the outside of the other asbestos plate 52 is covered. A storage tank 56 using a radiation shielding plate 55 having a sandwich structure covered with an FRP plate 54 and an SUS plate 53 is disclosed. The side wall, the upper wall, and the bottom wall of the storage tank 56 are all composed of a radiation shielding plate 55, and the lead plate 51 is joined in a T-shape at the connecting portion between the side wall and the upper wall and between the side wall and the bottom wall.

特公昭６３−２２５５６号公報Japanese Examined Patent Publication No. 63-22556

しかしながら、特許文献１に記載の放射線遮蔽板のサンドイッチ構造では、補強材が無いため、剛性が低く、比重の大きい鉛を大量に支持することができない。したがって、放射線遮蔽板の大型化は困難である。また、Ｔ字形に接合された鉛板の端部処理についての記載が無い。鉛は、人体に有害であるとともに、柔らかい材料なので取り扱いが困難で、接合及び端部処理には手間がかかる。接合箇所の端部処理に不具合が有ると、鉛が外部に流出するおそれがあり、鉛板同士の接合には安全性に疑問が残る。 However, in the sandwich structure of the radiation shielding plate described in Patent Document 1, since there is no reinforcing material, a large amount of lead with low rigidity and high specific gravity cannot be supported. Therefore, it is difficult to increase the size of the radiation shielding plate. Moreover, there is no description about the edge part process of the lead plate joined in T shape. Lead is harmful to the human body and is difficult to handle because it is a soft material, and it takes time and labor to bond and process the edges. If there is a defect in the end processing of the joint location, lead may flow out to the outside, and the question of safety remains in joining the lead plates.

そこで、本発明は、このような問題を解決するものであって、鉛板の取り扱いが容易で、且つ大型化が可能な放射線遮蔽板及び放射線遮蔽箱を提供することを目的とする。 Therefore, the present invention solves such problems, and an object of the present invention is to provide a radiation shielding plate and a radiation shielding box that can easily handle a lead plate and can be enlarged.

上述した課題を解決する本発明に係る放射線遮蔽板は、第１鋼板と、
前記第１鋼板の外周縁部に、外周全体にわたって設けられた枠材と、
前記枠材によって囲まれた前記第１鋼板上を複数の区画に仕切る仕切材と、
前記各区画内に設置された鉛板と、
一端が前記枠材又は前記仕切り材の何れかに接続されて、前記鉛板を前記各区間内に固定する固定材と、
前記第１鋼板と互いに対向するように配置されて、少なくとも１以上の前記区画を塞ぐ第２鋼板と、を備え、前記第１鋼板と前記枠材との間は密封されていることを特徴とする。 The radiation shielding plate according to the present invention for solving the above-described problems is a first steel plate,
A frame member provided over the entire outer periphery of the outer peripheral edge of the first steel plate;
A partition material for partitioning the first steel plate surrounded by the frame material into a plurality of sections;
A lead plate installed in each compartment;
One end is connected to either the frame member or the partition member, and a fixing member that fixes the lead plate in each section;
A second steel plate that is disposed so as to face the first steel plate and closes at least one of the compartments, and is sealed between the first steel plate and the frame member. To do.

上記放射線遮蔽板によれば、第１鋼板を枠材及び仕切材で補強するとともに、第１鋼板と対向するように第２鋼板を配置して、組み立て後の形状を箱型とすることで、剛性を高くすることができる。これにより、放射性遮蔽板の大型化が可能となる。
また、複数の鉛板を同一平面上に配置して１つの遮蔽材を形成するため、大きな１枚の鉛板を用いる場合よりも取り扱いが格段に容易になる。そして、複数の鉛板を用いることで、放射線遮蔽板を多様な形状に製作するとともに、様々な大きさに製作することが可能となる。
さらに、各区画内に鉛板を配置し、各鉛板をそれぞれ固定材で固定するため、鉛板の変形を確実に防止できる。そして、複数の鉛板を接合しないので、鉛板の設置に手間がかからない。
そして、第１鋼板と枠材との間は密封されているため、放射線を含む空気が放射線遮蔽板を通過することを防止できる。 According to the radiation shielding plate, the first steel plate is reinforced with a frame material and a partition material, and the second steel plate is arranged so as to face the first steel plate, and the shape after assembly is made into a box shape. The rigidity can be increased. Thereby, enlargement of a radioactive shielding board is attained.
In addition, since a plurality of lead plates are arranged on the same plane to form one shielding material, handling becomes much easier than when a single large lead plate is used. By using a plurality of lead plates, the radiation shielding plate can be manufactured in various shapes and can be manufactured in various sizes.
Furthermore, since a lead plate is arrange | positioned in each division and each lead plate is each fixed with a fixing material, the deformation | transformation of a lead plate can be prevented reliably. And since a some lead plate is not joined, installation of a lead plate does not take time.
And since it seals between the 1st steel plate and a frame material, it can prevent that the air containing a radiation passes a radiation shielding board.

また、前記枠材又は前記仕切材と前記鉛板との間には、隙間が生じないように鉛毛が充填されていてもよい。 In addition, lead hair may be filled between the frame member or the partition member and the lead plate so that no gap is generated.

このように、枠材又は仕切材と板との間には、鉛毛が充填されているため、隙間が生じない。これにより、隙間から放射線が透過することを防止できる。 Thus, since the bristle is filled between the frame member or partition member and the plate, no gap is generated. Thereby, it can prevent that a radiation permeate | transmits from a clearance gap.

また、前記鉛板は、前記各区画内に複数枚、積層可能であることとしてもよい。 Further, a plurality of the lead plates may be stacked in each compartment.

このように、各区画内に鉛板を積層可能なので、放射線の強度に応じた遮蔽能力を有する放射線遮蔽板を容易に製作することができる。 Thus, since a lead board can be laminated | stacked in each division, the radiation shielding board which has the shielding capability according to the intensity | strength of a radiation can be manufactured easily.

また、前記仕切材は、鋼材からなり、
前記第２鋼板は、前記仕切材と当接する箇所に開口を有しており、
前記第２鋼板の前記開口において、前記第２鋼板と前記仕切材とが溶接されていてもよい。 The partition material is made of steel,
The second steel plate has an opening at a position where it comes into contact with the partition material,
In the opening of the second steel plate, the second steel plate and the partition member may be welded.

このように、第２鋼板と仕切材とが溶接にて接続されているため、放射性遮蔽板の剛性を更に高くすることができる。 Thus, since the 2nd steel plate and the partition material are connected by welding, the rigidity of a radioactive shielding board can be made still higher.

また、前記第１鋼板は、開口を有しており、
前記第１鋼板の前記開口が形成されている前記区画には、当該開口を避けた箇所に、前記鉛板のかわりに前記鉛板よりも厚い鋼板が設置されていることとしてもよい。 Further, the first steel plate has an opening,
In the section in which the opening of the first steel plate is formed, a steel plate thicker than the lead plate may be installed in place of the opening in place of the lead plate.

このように、第１鋼板に開口が形成されているため、例えば、空気浄化装置から供給される空気を送給するための送給管や電源ケーブル等をこの開口に挿通させることができる。
また、開口が形成されている区画には、鉛板よりも厚い鋼板が設けられているため、放射線の透過を防止することができる。 Thus, since the opening is formed in the first steel plate, for example, a supply pipe or a power cable for supplying air supplied from the air purification device can be inserted into the opening.
Moreover, since the steel plate thicker than the lead plate is provided in the section in which the opening is formed, transmission of radiation can be prevented.

また、前記第１鋼板は、開口を有しており、
前記第２鋼板は、前記第１鋼板の前記開口と対向する位置に、前記第１鋼板の前記開口と同じ形状の開口を有しており、
前記第１鋼板の前記開口及び前記第２鋼板の前記開口が形成されている前記区画には、開閉可能な扉が設けられていてもよい。 Further, the first steel plate has an opening,
The second steel plate has an opening having the same shape as the opening of the first steel plate at a position facing the opening of the first steel plate,
An openable / closable door may be provided in the section in which the opening of the first steel plate and the opening of the second steel plate are formed.

このように、第１鋼板及び第２鋼板に形成された開口に扉が設けられているため、人が放射性遮蔽板を通過するこができる。 Thus, since the door is provided in the opening formed in the 1st steel plate and the 2nd steel plate, a person can pass a radioactive shielding board.

また、本発明に係る放射線遮蔽箱は、請求項１から５までのうち何れか一項に記載の放射線遮蔽板と、前記請求項６に記載の放射線遮蔽板とを組み合わせて箱型状に構築されており、
互いに隣接する前記放射線遮蔽板同士間は、密封されていることを特徴とする。 A radiation shielding box according to the present invention is constructed in a box shape by combining the radiation shielding plate according to any one of claims 1 to 5 and the radiation shielding plate according to claim 6. Has been
The radiation shielding plates adjacent to each other are hermetically sealed.

上記放射線遮蔽箱によれば、複数の放射線遮蔽板を組み合わせて箱型状に構築されているため、剛性が高い。これにより、放射線遮蔽箱の大型化が可能となる。そして、放射線遮蔽板は上述したように、様々な大きさに対応することができるため、放射線遮蔽箱も様々な大きさのものを製作することができる。
また、扉用の開口を有する放射性遮蔽板を備えているため、人が出入りすることができる。さらに、放射線遮蔽箱を組み立てる際に、鉛板の接合を要しないので、手間をかけることなく安全に放射線遮蔽箱を組み立てることができる。
そして、互いに隣接する放射線遮蔽板同士間は密封されているため、放射線遮蔽箱は密閉された状態となる。したがって、放射線を含む外気が放射線遮蔽箱内に入ってくることがない。 According to the radiation shielding box, since the plurality of radiation shielding plates are combined to form a box shape, the rigidity is high. Thereby, the radiation shielding box can be enlarged. Since the radiation shielding plate can correspond to various sizes as described above, the radiation shielding box can be manufactured in various sizes.
Moreover, since the radioactive shielding board which has the opening for doors is provided, a person can go in and out. Furthermore, when assembling the radiation shielding box, it is not necessary to join the lead plate, so that the radiation shielding box can be safely assembled without taking time and effort.
And since the radiation shielding plates adjacent to each other are sealed, the radiation shielding box is in a sealed state. Therefore, outside air containing radiation does not enter the radiation shielding box.

また、本発明に係る放射線遮蔽箱は、請求項１から５までのうち何れか一項に記載の放射線遮蔽板を複数枚組み合わせて箱型状に構築されており、
互いに隣接する前記放射線遮蔽板同士間は、密封されていることを特徴とする。 Moreover, the radiation shielding box according to the present invention is constructed in a box shape by combining a plurality of radiation shielding plates according to any one of claims 1 to 5,
The radiation shielding plates adjacent to each other are hermetically sealed.

上記放射線遮蔽箱によれば、複数の放射線遮蔽板を組み合わせて箱型状に構築されているため、剛性が高い。これにより、放射線遮蔽箱の大型化が可能となる。そして、放射線遮蔽板は上述したように、様々な大きさに対応することができるため、放射線遮蔽箱も様々な大きさのものを製作することができる。
また、放射線遮蔽箱を組み立てる際に、鉛板の接合を要しないので、手間をかけることなく安全に放射線遮蔽箱を組み立てることができる。
そして、各放射線遮蔽板は、互いに隣接する放射線遮蔽板同士間は密封されているため、放射線遮蔽箱は密閉された状態となる。したがって、放射線を含む外気が放射線遮蔽箱内に入ってくることがない。 According to the radiation shielding box, since the plurality of radiation shielding plates are combined to form a box shape, the rigidity is high. Thereby, the radiation shielding box can be enlarged. Since the radiation shielding plate can correspond to various sizes as described above, the radiation shielding box can be manufactured in various sizes.
Moreover, when assembling the radiation shielding box, it is not necessary to join the lead plates, so that the radiation shielding box can be safely assembled without taking time and effort.
Since each radiation shielding plate is sealed between adjacent radiation shielding plates, the radiation shielding box is in a sealed state. Therefore, outside air containing radiation does not enter the radiation shielding box.

また、放射線物質を浄化する空気浄化装置を備え、前記空気浄化装置によって供給される空気によって与圧されて、内部は大気圧よりも高い気圧を有していてもよい。 Moreover, the air purification apparatus which purifies a radioactive substance may be provided, and it may be pressurized by the air supplied by the said air purification apparatus, and the inside may have atmospheric pressure higher than atmospheric pressure.

このように、空気浄化装置を備えているため、浄化された空気を放射線遮蔽箱内に供給することができる。
また、放射線遮蔽箱内の気圧を大気圧よりも高くすることで、万が一、放射線遮蔽箱に外気と通じる隙間が形成されていても、放射線を含む外気が放射線遮蔽箱内に入ることを防止できる。 Thus, since the air purification apparatus is provided, the purified air can be supplied into the radiation shielding box.
In addition, by setting the atmospheric pressure in the radiation shielding box to be higher than the atmospheric pressure, it is possible to prevent outside air containing radiation from entering the radiation shielding box even if a gap communicating with the outside air is formed in the radiation shielding box. .

また、前記各放射線遮蔽板は、前記第１鋼板が外側になるように配置されており、
前記第１鋼板と前記枠材との間は密封されていることとしてもよい。 Each of the radiation shielding plates is disposed such that the first steel plate is on the outside,
A space between the first steel plate and the frame member may be sealed.

このように、第１鋼板と枠材との間は密封されているため、放射線を含む空気が放射線遮蔽箱内に流入することを防止できる。 Thus, since the space between the first steel plate and the frame member is sealed, air containing radiation can be prevented from flowing into the radiation shielding box.

本発明によれば、鉛の取り扱いが容易で、且つ大型化が可能な放射線遮蔽板及び放射線遮蔽箱を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the handling of lead is easy and the radiation shielding board and radiation shielding box which can be enlarged can be provided.

本発明に係る放射線遮蔽箱を示す斜視図である。It is a perspective view which shows the radiation shielding box which concerns on this invention. 第１放射線遮蔽板の内壁側を上面にした斜視図である。It is the perspective view which made the inner wall side of the 1st radiation shielding board the upper surface. 第１放射線遮蔽板の外壁側を上面にした斜視図である。It is the perspective view which made the outer wall side of the 1st radiation shielding board the upper surface. 図３のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図３のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 枠状に組み立てられた角型鋼に第１鋼板を接合した状態を示す図である。It is a figure which shows the state which joined the 1st steel plate to the square steel assembled in frame shape. 各区画内に鉛板を設置している状態を示す図である。It is a figure which shows the state which has installed the lead board in each division. 鉛板を固定する第１アングル及び第２アングルを取り付けている状態を示す図である。It is a figure which shows the state which has attached the 1st angle and 2nd angle which fix a lead plate. 第２鋼板を角型鋼に接合した状態を示す図である。It is a figure which shows the state which joined the 2nd steel plate to the square steel. 第２放射線遮蔽板を示す斜視図である。It is a perspective view which shows a 2nd radiation shielding plate. 図１０のＣ−Ｃ断面図である。It is CC sectional drawing of FIG. 図１０のＤ−Ｄ断面図である。It is DD sectional drawing of FIG. 角型鋼に第１鋼板を接合した状態を示す図である。It is a figure which shows the state which joined the 1st steel plate to the square steel. 第１鋼板上を複数の区画に仕切った状態を示す図である。It is a figure which shows the state which partitioned off the 1st steel plate into the some division. 開口の無い各区画内に鉛板及び第３アングルを設置した状態を示す図である。It is a figure which shows the state which installed the lead plate and the 3rd angle in each division without an opening. 第２鋼板を角型鋼に接合した状態を示す図である。It is a figure which shows the state which joined the 2nd steel plate to the square steel. 第３放射線遮蔽板を示す斜視図である。It is a perspective view which shows a 3rd radiation shielding plate. 図１７のＥ−Ｅ断面図である。It is EE sectional drawing of FIG. 図１７のＦ−Ｆ断面図である。It is FF sectional drawing of FIG. 角型鋼に第１鋼板を接合した状態を示す図である。It is a figure which shows the state which joined the 1st steel plate to the square steel. 開口の無い各区画内に鉛板及び第３アングルを設置した状態を示す図である。It is a figure which shows the state which installed the lead plate and the 3rd angle in each division without an opening. 第２鋼板を角型鋼に接合した状態を示す図である。It is a figure which shows the state which joined the 2nd steel plate to the square steel. 鉛板及び鋼板の板厚とガンマ線の実効線量透過率との関係を示す図である。It is a figure which shows the relationship between the plate | board thickness of a lead plate and a steel plate, and the effective dose transmittance of a gamma ray. 従来の放射線遮蔽板を用いた貯留槽の断面図である。It is sectional drawing of the storage tank using the conventional radiation shielding board.

以下、本発明に係る放射線遮蔽板について図面を用いて詳細に説明する。なお、以下の実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。 Hereinafter, the radiation shielding plate according to the present invention will be described in detail with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative arrangements, and the like of the components described in the following examples are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative. It is just an example.

図１は、本発明に係る放射線遮蔽箱を示す斜視図である。
図１に示すように、本発明に係る放射線遮蔽箱１０は、上壁、底壁及び側壁として用いられる第１放射線遮蔽板１と、通気用の開口２１を有する側壁として用いられる第２放射線遮蔽板２と、扉３０を有する側壁として用いられる第３放射線遮蔽板３と、放射線物質を浄化する空気浄化装置４と、内部の温度を調整する空調装置５と、を備えている。放射線遮蔽箱１０は、放射線管理区域内に載置されて、この中に人が入って作業するためのものである。
上壁と各側壁との接続部、各側壁同士の接続部及び側壁と底壁との接続部は、隙間が生じないように全周溶接によって密封されている。即ち隣接する第１放射線遮蔽板１同士の接続部、第１放射線遮蔽板１と第２放射線遮蔽板２との接続部及び第１放射線遮蔽板１と第３放射線遮蔽板３との接続部は、全周溶接されている。これにより、各接続部から放射線を含む外気が内部へ入ることを防止できる。 FIG. 1 is a perspective view showing a radiation shielding box according to the present invention.
As shown in FIG. 1, a radiation shielding box 10 according to the present invention includes a first radiation shielding plate 1 used as an upper wall, a bottom wall, and a side wall, and a second radiation shielding used as a side wall having an opening 21 for ventilation. A plate 2, a third radiation shielding plate 3 used as a side wall having a door 30, an air purification device 4 for purifying radioactive material, and an air conditioner 5 for adjusting the internal temperature are provided. The radiation shielding box 10 is placed in a radiation management area, and is used for a person to enter and work.
The connecting portion between the upper wall and each side wall, the connecting portion between the side walls, and the connecting portion between the side wall and the bottom wall are sealed by all-around welding so that no gap is generated. That is, the connection part between the adjacent first radiation shielding plates 1, the connection part between the first radiation shielding plate 1 and the second radiation shielding plate 2, and the connection part between the first radiation shielding plate 1 and the third radiation shielding plate 3 are It is welded all around. Thereby, it can prevent that the external air containing a radiation enters into an inside from each connection part.

図２は、第１放射線遮蔽板１の第１鋼板を上側にした斜視図である。また、図３は、第１放射線遮蔽板１の第２鋼板１２を上側にした斜視図である。
図２及び図３に示すように、第１放射線遮蔽板１は、第１鋼板１１と、第１鋼板１１の外周端部を囲うように設けられた角型鋼１３と、第１鋼板１１と互いに対向するように配置された第２鋼板１２と、放射線を遮蔽するための複数の鉛板１４と、を備えている。
第１放射線遮蔽板１は、放射線遮蔽箱１０に用いられる場合、第１鋼板１１が外気側、第２鋼板１２が内部側（即ち室内側）となるように配置される。 FIG. 2 is a perspective view with the first steel plate of the first radiation shielding plate 1 facing upward. FIG. 3 is a perspective view with the second steel plate 12 of the first radiation shielding plate 1 facing upward.
As shown in FIGS. 2 and 3, the first radiation shielding plate 1 includes a first steel plate 11, a square steel 13 provided so as to surround the outer peripheral end of the first steel plate 11, and the first steel plate 11. It has the 2nd steel plate 12 arrange | positioned so that it may oppose, and the some lead plate 14 for shielding a radiation.
When the first radiation shielding plate 1 is used for the radiation shielding box 10, the first steel plate 11 is disposed on the outside air side, and the second steel plate 12 is disposed on the inner side (that is, the indoor side).

第１鋼板１１の外周側面１１ａは角型鋼１３に全周溶接によって接合されている（図２参照）。第１鋼板１１の外周側面１１ａを角型鋼１３の表面に全周溶接することで、第１鋼板１１と角型鋼１３との間が封止されるため、放射線を含む外気がその隙間を通過して内部へ入ることを防止できる。 The outer peripheral side surface 11a of the first steel plate 11 is joined to the square steel 13 by all-around welding (see FIG. 2). By welding the outer peripheral side surface 11a of the first steel plate 11 to the surface of the square steel 13, the space between the first steel plate 11 and the square steel 13 is sealed, so that outside air containing radiation passes through the gap. Can be prevented from entering the interior.

第２鋼板１２の外周側面１２ａは角型鋼１３に断続溶接によって接合されている（図３参照）。断絶溶接により、第２鋼板１２と角型鋼１３との間に空気が通過可能な隙間が存在しても、第１鋼板１１と角型鋼１３との間が完全に封止されているため、放射線を含む外気が第１放射線遮蔽板１を通過して内部へ入ることはない。
第２鋼板１２を角型鋼１３に断続溶接する理由は、溶接による熱をできるだけ鉛板１４に与えないためである。詳細は後述するが、第１放射線遮蔽板１の製作は、まず、角型鋼１３に溶接された第１鋼板１１上に鉛板１４を設置し、次に、第２鋼板１２を角型鋼１３に溶接で接合する手順で行う。第２鋼板１２を角型鋼１３に溶接する際に、溶接量を減らして溶接による熱をできるだけ鉛板１４に与えないようにするためである。
なお、角型鋼１３が厚くて溶接の熱が鉛板１４に伝わりにくい場合等は、第２鋼板１２の外周側面１２ａを角型鋼１３に全周溶接してもよい。要は、第１鋼板１１及び第２鋼板１２のうち、少なくとも何れか一方が角型鋼１３に全周溶接によって接合されていればよい。 The outer peripheral side surface 12a of the second steel plate 12 is joined to the square steel 13 by intermittent welding (see FIG. 3). Even if there is a gap through which air can pass between the second steel plate 12 and the square steel 13 by break welding, the gap between the first steel plate 11 and the square steel 13 is completely sealed. Does not enter the interior through the first radiation shielding plate 1.
The reason why the second steel plate 12 is intermittently welded to the square steel 13 is that heat from the welding is not applied to the lead plate 14 as much as possible. Although details will be described later, the first radiation shielding plate 1 is manufactured by first installing the lead plate 14 on the first steel plate 11 welded to the square steel 13, and then the second steel plate 12 to the square steel 13. The procedure is to join by welding. This is because when the second steel plate 12 is welded to the square steel 13, the amount of welding is reduced so that heat from the welding is not applied to the lead plate 14 as much as possible.
When the square steel 13 is thick and heat of welding is not easily transmitted to the lead plate 14, the outer peripheral side surface 12 a of the second steel plate 12 may be welded to the square steel 13 all around. In short, it is sufficient that at least one of the first steel plate 11 and the second steel plate 12 is joined to the square steel 13 by all-around welding.

角型鋼１３は、その厚さが鉛板１４の厚さよりも数倍以上長いものを用いる。例えば、厚さが５ｍｍの鉛板１４を用いる場合には、５０ｍｍの角型鋼１３を用いる。これにより、鉛板１４を複数枚積層することが可能となる。鉛板１４の積層枚数を変更することで、強度の異なる放射線に対応できるため、各現場に応じた第１放射線遮蔽板１を製作することができる。 The square steel 13 has a thickness that is several times longer than the thickness of the lead plate 14. For example, when a lead plate 14 having a thickness of 5 mm is used, a square steel 13 having a thickness of 50 mm is used. Thereby, a plurality of lead plates 14 can be stacked. By changing the number of laminated lead plates 14, it is possible to cope with radiation having different intensities, and thus the first radiation shielding plate 1 corresponding to each site can be manufactured.

また、第２鋼板１２は、フラットバー１５（詳細は後述する）に当接する箇所に開口１９を有している。第２鋼板１２の開口１９において、第２鋼板１２とフラットバー１５とが点溶接にて接合されている。 In addition, the second steel plate 12 has an opening 19 at a location where it abuts against a flat bar 15 (details will be described later). In the opening 19 of the second steel plate 12, the second steel plate 12 and the flat bar 15 are joined by spot welding.

本実施形態では、第１鋼板１１及び第２鋼板１２として、幅、奥行きがそれぞれ４０００ｍｍ、２０００ｍｍのものを用いた。また、第１鋼板１１及び第２鋼板１２の厚さは、それぞれ９ｍｍ、３．２ｍｍとした。そして、角型鋼１３として、正方形の断面形状を有し、一辺が５０ｍｍのものを用いた。なお、角型鋼１３は放射線の遮蔽率を向上させるために、中実のものを用いた。 In the present embodiment, the first steel plate 11 and the second steel plate 12 have a width and a depth of 4000 mm and 2000 mm, respectively. Moreover, the thickness of the 1st steel plate 11 and the 2nd steel plate 12 was 9 mm and 3.2 mm, respectively. The square steel 13 has a square cross-sectional shape and one side is 50 mm. In addition, the solid steel 13 was used in order to improve the radiation shielding rate.

図４及び図５は、それぞれ図２のＡ−Ａ断面図、Ｂ−Ｂ断面図である。
図４及び図５に示すように、第１放射線遮蔽板１は、複数のフラットバー１５と、各鉛板１４を各区間内にそれぞれ固定する複数の第１アングル１６及び複数の第２アングル１７を更に備えている。
フラットバー１５は、第１鋼板１１、第２鋼板１２及び角型鋼１３に囲まれた内側を、複数の区画に仕切るように配置されている。フラットバー１５は、各区画の大きさ（即ち幅方向及び奥行き方向の長さ）がすべて同一となるように配置されている。各区間の大きさは、鉛板１４の取り扱いが容易な範囲の大きさとする。 4 and 5 are cross-sectional views taken along the lines AA and BB in FIG. 2, respectively.
As shown in FIGS. 4 and 5, the first radiation shielding plate 1 includes a plurality of flat bars 15 and a plurality of first angles 16 and a plurality of second angles 17 that respectively fix the lead plates 14 in each section. Is further provided.
The flat bar 15 is disposed so as to partition the inside surrounded by the first steel plate 11, the second steel plate 12, and the square steel 13 into a plurality of sections. The flat bar 15 is arranged so that the size of each section (that is, the length in the width direction and the depth direction) is the same. The size of each section is set to a size that allows easy handling of the lead plate 14.

鉛板１４は、各区画内にそれぞれ設置されている。鉛板１４の大きさは、各区画の大きさと同じになるように形成されている。また、鉛板１４の厚さもすべて同一に形成されている。
鉛板１４と角型鋼１３又はフラットバー１５との間に隙間が有る場合には、その隙間に鉛毛（図示しない）を充填して隙間を埋める。また、鉛板１４は、放射線の強度に応じて、複数枚積層させて用いる。 The lead plate 14 is installed in each compartment. The size of the lead plate 14 is formed to be the same as the size of each section. Further, the lead plates 14 are all formed in the same thickness.
If there is a gap between the lead plate 14 and the square steel 13 or the flat bar 15, the gap is filled with lead hair (not shown). A plurality of lead plates 14 are used depending on the intensity of radiation.

第１アングル１６は、鉛板１４の外周に沿って配置されている。第１アングル１６の一方の側方端は角型鋼１３又はフラットバー１５に点溶接にて接合され、他方の側方端は鉛板１４の外周縁部に当接している。
第２アングル１７は、両方の側方端が鉛板１４の中央部に当接するように配置されている。第２アングル１７の両端はそれぞれ第１アングル１６に点溶接にて接合されている。
第１アングル１６及び第２アングル１７は、点溶接にて接合されているため、溶接による熱は鉛板１４に伝わらない。 The first angle 16 is disposed along the outer periphery of the lead plate 14. One side end of the first angle 16 is joined to the square steel 13 or the flat bar 15 by spot welding, and the other side end is in contact with the outer peripheral edge of the lead plate 14.
The second angle 17 is arranged such that both side ends abut against the central portion of the lead plate 14. Both ends of the second angle 17 are joined to the first angle 16 by spot welding.
Since the first angle 16 and the second angle 17 are joined by spot welding, heat due to welding is not transmitted to the lead plate 14.

本実施形態では、フラットバー１５として、幅、厚さがそれぞれ５０ｍｍ、１６ｍｍのものを用いた。また、鉛板１４の厚さは、５ｍｍとした。 In the present embodiment, the flat bar 15 having a width and thickness of 50 mm and 16 mm, respectively, was used. Moreover, the thickness of the lead plate 14 was 5 mm.

次に、図６から図９に基づいて、上述した構成からなる第１放射線遮蔽板１の製作方法について説明する。 Next, a manufacturing method of the first radiation shielding plate 1 having the above-described configuration will be described with reference to FIGS.

まず、４本の角型鋼１３を枠状に組み立てて、溶接にて接合する。このとき互いに隣接する角型鋼１３間に隙間が生じないように溶接する。
図６は、枠状に組み立てられた角型鋼１３に第１鋼板１１を接合した状態を示す図である。
図６に示すように、枠状に組み立てられた角型鋼１３の表面に第１鋼板１１の外周側面１１ａを全周溶接にて接合する。溶接後、第１鋼板１１が下になるように反転させる。
次に、角型鋼１３によって囲まれた第１鋼板１１上にフラットバー１５を配置して、第１鋼板１１上を複数の区画に仕切る。このとき、各区画の形状がすべて同一となるようにフラットバー１５を配置する。各区画の大きさ（幅方向及び奥行き方向の長さ）は、予め設計等により決定されている。フラットバー１５は、第１鋼板１１に点溶接にて接合されるが、点溶接に限定されるものではなく、点溶接よりも長い断続溶接でもよい。
図７は、各区画内に鉛板１４を設置している状態を示す図である。
図７に示すように、各区画内にそれぞれ鉛板１４を設置する。鉛板１４の大きさはすべて同一とし、重量、剛性的に人力にて容易に運搬できる形状を選択する事によって、短時間で容易に設置することができる。鉛板１４と角型鋼１３又はフラットバー１５との間に隙間が有る場合には、その隙間に鉛毛を充填して隙間を埋める。鉛板１４は、放射線の強度に応じて、複数枚積層させてもよい。
図８は、鉛板１４を固定する第１アングル１６及び第２アングル１７を取り付けている状態を示す図である。
図８に示すように、第１アングル１６を鉛板１４の外周に沿って配置し、角型鋼１３又はフラットバー１５に接合する。第１アングル１６の一方の側方端を鉛板１４の上面に当接させて、他方の側方端を角型鋼１３又はフラットバー１５に点溶接にて接合する。
また、第２アングル１７を鉛板１４の中央部付近に配置し、両端を第１アングル１６に接合する。第２アングル１７の両方の側方端を鉛板１４の上面に当接させて、両端をそれぞれ第１アングル１６に点溶接にて接合する。第１アングル１６及び第２アングル１７は点溶接にて接合されるので、溶接による熱は鉛板１４に伝わらない。
図９は、第２鋼板１２を角型鋼１３に接合した状態を示す図である。
図９に示すように、角型鋼１３の上面に第２鋼板１２の外周側面１２ａを断続溶接にて接合する。また、フラットバー１５の上面に第２鋼板１２の開口１９の側面を点溶接にて接合する。第２鋼板１２は、断続溶接や点溶接にてそれぞれ角型鋼１３及びフラットバー１５に接合されるので、溶接による熱は鉛板１４に伝わらない。 First, four square steels 13 are assembled in a frame shape and joined by welding. At this time, welding is performed so that no gap is generated between the square steels 13 adjacent to each other.
FIG. 6 is a view showing a state in which the first steel plate 11 is joined to the square steel 13 assembled in a frame shape.
As shown in FIG. 6, the outer peripheral side surface 11a of the 1st steel plate 11 is joined to the surface of the square steel 13 assembled in frame shape by all-around welding. After welding, the first steel plate 11 is inverted so that it faces down.
Next, the flat bar 15 is arrange | positioned on the 1st steel plate 11 enclosed by the square steel 13, and the 1st steel plate 11 top is partitioned into a some division. At this time, the flat bars 15 are arranged so that the shapes of the sections are all the same. The size of each section (the length in the width direction and the depth direction) is determined in advance by design or the like. The flat bar 15 is joined to the first steel plate 11 by spot welding, but is not limited to spot welding, and may be intermittent welding longer than spot welding.
FIG. 7 is a diagram showing a state in which the lead plate 14 is installed in each section.
As shown in FIG. 7, a lead plate 14 is installed in each compartment. The lead plates 14 are all the same size, and can be easily installed in a short time by selecting a shape that can be easily transported by human power in terms of weight and rigidity. When there is a gap between the lead plate 14 and the square steel 13 or the flat bar 15, the gap is filled with lead hairs. A plurality of lead plates 14 may be laminated according to the intensity of radiation.
FIG. 8 is a view showing a state in which the first angle 16 and the second angle 17 for fixing the lead plate 14 are attached.
As shown in FIG. 8, the first angle 16 is disposed along the outer periphery of the lead plate 14 and joined to the square steel 13 or the flat bar 15. One side end of the first angle 16 is brought into contact with the upper surface of the lead plate 14, and the other side end is joined to the square steel 13 or the flat bar 15 by spot welding.
Further, the second angle 17 is disposed near the center of the lead plate 14 and both ends are joined to the first angle 16. Both side ends of the second angle 17 are brought into contact with the upper surface of the lead plate 14, and both ends are joined to the first angle 16 by spot welding. Since the first angle 16 and the second angle 17 are joined by spot welding, heat due to welding is not transmitted to the lead plate 14.
FIG. 9 is a view showing a state in which the second steel plate 12 is joined to the square steel 13.
As shown in FIG. 9, the outer peripheral side surface 12 a of the second steel plate 12 is joined to the upper surface of the square steel 13 by intermittent welding. Further, the side surface of the opening 19 of the second steel plate 12 is joined to the upper surface of the flat bar 15 by spot welding. Since the second steel plate 12 is joined to the square steel 13 and the flat bar 15 by intermittent welding and spot welding, respectively, heat due to welding is not transmitted to the lead plate 14.

次に、第２放射線遮蔽板２について説明する。以下の説明において、第１放射線遮蔽板１に対応する部分には同一の符号を付して説明を省略し、主に相違点について説明する。第２放射線遮蔽板２は、第１鋼板１１に開口を設け、第２鋼板１２に切欠きを設けたものである。 Next, the second radiation shielding plate 2 will be described. In the following description, portions corresponding to the first radiation shielding plate 1 are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described. The second radiation shielding plate 2 is provided with an opening in the first steel plate 11 and a notch in the second steel plate 12.

図１０は、第２放射線遮蔽板２を示す斜視図である。また、図１１及び図１２は、それぞれ図１０のＣ−Ｃ断面図、Ｄ−Ｄ断面図である。
図１０〜図１２に示すように、第２放射線遮蔽板２は、第１鋼板１１と、角型鋼１３と、第２鋼板１２と、鉛板１４と、区画用鋼板２５と、フラットバー１５と、第３アングル２４と、を備えている。 FIG. 10 is a perspective view showing the second radiation shielding plate 2. 11 and 12 are a CC cross-sectional view and a DD cross-sectional view, respectively, in FIG.
As shown in FIGS. 10 to 12, the second radiation shielding plate 2 includes a first steel plate 11, a square steel 13, a second steel plate 12, a lead plate 14, a partition steel plate 25, and a flat bar 15. , A third angle 24.

第１鋼板１１の外周側面１１ａ及び第２鋼板１２の外周側面１２ａは、第１放射線遮蔽板１と同様に、それぞれ角型鋼１３に全周溶接、断続溶接によって接合されている。
第１鋼板１１は、空気浄化装置４に接続された送給管や空調装置５の送給管等を挿通するための複数の開口２１を有している。
また、第２鋼板１２は、第１鋼板１１の開口２１を有する区画と対向する位置に、当該区画と同じ形状の切欠き２２を有している。なお、第２鋼板１２は、第１鋼板１１の開口２１と対向する位置に、当該開口２１と同じ形状の開口を有することとしてもよい。 Similar to the first radiation shielding plate 1, the outer peripheral side surface 11 a of the first steel plate 11 and the outer peripheral side surface 12 a of the second steel plate 12 are joined to the square steel 13 by full circumference welding and intermittent welding, respectively.
The first steel plate 11 has a plurality of openings 21 through which a feed pipe connected to the air purification device 4 and a feed pipe of the air conditioner 5 are inserted.
Moreover, the 2nd steel plate 12 has the notch 22 of the same shape as the said division in the position facing the division which has the opening 21 of the 1st steel plate 11. FIG. The second steel plate 12 may have an opening having the same shape as the opening 21 at a position facing the opening 21 of the first steel plate 11.

第１鋼板１１の開口２１が形成されている区画には、区画用鋼板２５が設置されている。区画用鋼板２５の大きさは、各区画の大きさと同じになるように形成されている。区画用鋼板２５は、当該開口２１と対向する位置に、当該開口２１と同じ形状の開口２３を有している。また、区画用鋼板２５は、鉛板１４よりも厚いものが用いられている。具体的には、開口２１の無い他の区画に設置される鉛板１４の放射線透過率と同等の性能を実現可能な厚さの鋼板を用いる。 A partition steel plate 25 is installed in the partition where the opening 21 of the first steel plate 11 is formed. The size of the partition steel plate 25 is formed to be the same as the size of each partition. The partition steel plate 25 has an opening 23 having the same shape as the opening 21 at a position facing the opening 21. The partition steel plate 25 is thicker than the lead plate 14. Specifically, a steel plate having a thickness capable of realizing performance equivalent to the radiation transmittance of the lead plate 14 installed in another section without the opening 21 is used.

第３アングル２４は、一方の側面が鉛板１４の角部に当接するように配置されて、鉛板１４を固定している。第３アングル２４の他方の側面が角型鋼１３又はフラットバー１５に点溶接にて接合されている。 The third angle 24 is disposed such that one side surface abuts on a corner portion of the lead plate 14 and fixes the lead plate 14. The other side surface of the third angle 24 is joined to the square steel 13 or the flat bar 15 by spot welding.

次に、図１３から図１６に基づいて、上述した構成からなる第２放射線遮蔽板２の製作方法について説明する。 Next, a method for manufacturing the second radiation shielding plate 2 having the above-described configuration will be described with reference to FIGS.

まず、第１放射線遮蔽板１と同様に、４本の角型鋼１３を枠状に組み立てて、開口２１を有する第１鋼板１１を角型鋼１３に全周溶接で接合する。溶接後、図１３に示すように、第１鋼板１１が下側となるように反転させる。
図１４は、第１鋼板１１上を複数の区画に仕切った状態を示す図である。
図１４に示すように、角型鋼１３によって囲まれた第１鋼板１１上にフラットバー１５を配置して、第１鋼板１１上を複数の区画に仕切る。続いて、開口２１を有する各区画内にそれぞれ区画用鋼板２５を設置する。区画用鋼板２５には当該開口２１と同じ形状の開口２３が形成されているので、開口２１、２３同士の位置が一致するように配置する。
図１５は、開口２１の無い各区画内に鉛板１４及び第３アングル２４を設置した状態を示す図である。
図１５に示すように、各区画内にそれぞれ鉛板１４を設置する。次に、第３アングル２４を鉛板１４の角部に配置し、角型鋼１３又はフラットバー１５に接合する。第３アングル２４の一方の側面を鉛板１４の上面に当接させて、他方の側面を角型鋼１３又はフラットバー１５に点溶接にて接合する。第３アングル２４は点溶接にて接合されるので、溶接による熱は鉛板１４に伝わらない。
図１６は、第２鋼板１２を取り付けた状態を示す図である。
図１６に示すように、角型鋼１３の上面に第２鋼板１２を断続溶接にて接合する。第２鋼板１２には、第１鋼板１１の開口２１を有する区画と対向する位置に、当該区画と同じ形状の切欠き２２が形成されているので、開口２１を有する区画と切欠き２２の位置が一致するように配置する。また、フラットバー１５の上面に第２鋼板１２の開口１９の側面を点溶接にて接合する。 First, similarly to the first radiation shielding plate 1, four square steels 13 are assembled in a frame shape, and the first steel plate 11 having the opening 21 is joined to the square steel 13 by all-around welding. After welding, as shown in FIG. 13, the first steel plate 11 is inverted so as to be on the lower side.
FIG. 14 is a diagram illustrating a state in which the first steel plate 11 is partitioned into a plurality of sections.
As shown in FIG. 14, the flat bar 15 is arrange | positioned on the 1st steel plate 11 enclosed by the square steel 13, and the 1st steel plate 11 top is divided into a some division. Subsequently, a partition steel plate 25 is installed in each partition having the openings 21. Since the partitioning steel plate 25 has the opening 23 having the same shape as the opening 21, the partitioning steel plate 25 is disposed so that the positions of the openings 21 and 23 coincide with each other.
FIG. 15 is a view showing a state in which the lead plate 14 and the third angle 24 are installed in each section without the opening 21.
As shown in FIG. 15, a lead plate 14 is installed in each compartment. Next, the third angle 24 is disposed at the corner of the lead plate 14 and joined to the square steel 13 or the flat bar 15. One side surface of the third angle 24 is brought into contact with the upper surface of the lead plate 14, and the other side surface is joined to the square steel 13 or the flat bar 15 by spot welding. Since the third angle 24 is joined by spot welding, heat due to welding is not transmitted to the lead plate 14.
FIG. 16 is a diagram illustrating a state in which the second steel plate 12 is attached.
As shown in FIG. 16, the second steel plate 12 is joined to the upper surface of the square steel 13 by intermittent welding. Since the notch 22 having the same shape as the section is formed in the second steel plate 12 at a position facing the section having the opening 21 of the first steel plate 11, the position of the section having the opening 21 and the notch 22 is formed. Place so that they match. Further, the side surface of the opening 19 of the second steel plate 12 is joined to the upper surface of the flat bar 15 by spot welding.

次に、第３放射線遮蔽板３について説明する。第３放射線遮蔽板３は、第１鋼板１１及び第２鋼板１２にそれぞれ扉３０用の開口３１、３２を設けたものである。 Next, the third radiation shielding plate 3 will be described. The third radiation shielding plate 3 is obtained by providing openings 31 and 32 for the door 30 in the first steel plate 11 and the second steel plate 12, respectively.

図１７は、第３放射線遮蔽板３を示す斜視図である。また、図１８及び図１９は、それぞれ図１７のＥ−Ｅ断面図、Ｆ−Ｆ断面図である。
図１７〜図１９に示すように、第３放射線遮蔽板３は、第１鋼板１１と、角型鋼１３と、第２鋼板１２と、鉛板１４と、フラットバー１５と、第３アングル２４と、を備えている。
第１鋼板１１は、扉３０を設置するための開口３１を有している。また、第２鋼板１２は、第１鋼板１１の開口３１と対向する位置に、当該開口３１と同じ形状の開口３２を有している。
第１鋼板１１の開口３１及び第２鋼板１２の開口３２が形成されている区画には、図示しないが開閉可能な扉３０が設置される。
第１鋼板１１の外周側面１１ａ及び第２鋼板１２の外周側面１２ａは、第１放射線遮蔽板１及び第２放射線遮蔽板２と同様に、それぞれ角型鋼１３に全周溶接、断続溶接によって接合されている。 FIG. 17 is a perspective view showing the third radiation shielding plate 3. 18 and 19 are a cross-sectional view taken along line EE and a cross-sectional view taken along line FF in FIG. 17, respectively.
As shown in FIGS. 17 to 19, the third radiation shielding plate 3 includes a first steel plate 11, a square steel 13, a second steel plate 12, a lead plate 14, a flat bar 15, and a third angle 24. It is equipped with.
The first steel plate 11 has an opening 31 for installing the door 30. The second steel plate 12 has an opening 32 having the same shape as the opening 31 at a position facing the opening 31 of the first steel plate 11.
Although not shown, a door 30 that can be opened and closed is installed in a section where the opening 31 of the first steel plate 11 and the opening 32 of the second steel plate 12 are formed.
The outer peripheral side surface 11a of the first steel plate 11 and the outer peripheral side surface 12a of the second steel plate 12 are joined to the square steel 13 by full circumference welding and intermittent welding, respectively, similarly to the first radiation shielding plate 1 and the second radiation shielding plate 2. ing.

次に、図２０から図２２に基づいて、上述した構成からなる第３放射線遮蔽板３の製作方法について説明する。 Next, a manufacturing method of the third radiation shielding plate 3 having the above-described configuration will be described with reference to FIGS.

まず、第１放射線遮蔽板１及び第２放射線遮蔽板２と同様に、４本の角型鋼１３を枠状に組み立てて、開口３１を有する第１鋼板１１を角型鋼１３に全周溶接で接合する。溶接後、図２０に示すように、第１鋼板１１が下側となるように反転させる。続いて、角型鋼１３によって囲まれた第１鋼板１１上にフラットバー１５を配置して、第１鋼板１１上を複数の区画に仕切る。
図２１は、開口３１の無い各区画内に鉛板１４及び第３アングル２４を設置した状態を示す図である。
図２１に示すように、開口３１の無い各区画内にそれぞれ鉛板１４を設置する。次に、第３アングル２４で鉛板１４を固定する。
図２２は、第２鋼板１２を角型鋼１３に接合した状態を示す図である。
図２２に示すように、角型鋼１３の上面に第２鋼板１２を断続溶接にて接合する。第２鋼板１２には、第１鋼板１１の開口３１と対向する位置に、当該開口３１と同じ形状の開口３２が形成されているので、開口３１、３２同士の位置が一致するように配置する。また、フラットバー１５の上面に第２鋼板１２の開口１９の側面を点溶接にて接合する。 First, like the first radiation shielding plate 1 and the second radiation shielding plate 2, four square steels 13 are assembled in a frame shape, and the first steel plate 11 having the opening 31 is joined to the square steel 13 by all-around welding. To do. After welding, as shown in FIG. 20, the first steel plate 11 is inverted so that it is on the lower side. Then, the flat bar 15 is arrange | positioned on the 1st steel plate 11 enclosed with the square steel 13, and the 1st steel plate 11 top is divided into a some division.
FIG. 21 is a diagram showing a state in which the lead plate 14 and the third angle 24 are installed in each section without the opening 31.
As shown in FIG. 21, the lead plate 14 is installed in each section without the opening 31. Next, the lead plate 14 is fixed by the third angle 24.
FIG. 22 is a view showing a state in which the second steel plate 12 is joined to the square steel 13.
As shown in FIG. 22, the second steel plate 12 is joined to the upper surface of the square steel 13 by intermittent welding. Since the opening 32 having the same shape as the opening 31 is formed in the second steel plate 12 at a position facing the opening 31 of the first steel plate 11, the second steel plate 12 is arranged so that the positions of the openings 31 and 32 coincide with each other. . Further, the side surface of the opening 19 of the second steel plate 12 is joined to the upper surface of the flat bar 15 by spot welding.

次に、鉛板及び鋼板の板厚とガンマ線の実効線量透過率との関係について、図２３を用いて説明する。 Next, the relationship between the plate thickness of the lead plate and the steel plate and the effective dose transmittance of gamma rays will be described with reference to FIG.

図２３は、鉛板及び鋼板の板厚とガンマ線の実効線量透過率との関係を示す図である。
図２３に示すように、鉛板及び鋼板によって、コバルト（^６０Ｃｏ）、セシウム（^１３７Ｃｓ）、ヨウ素（^１３１Ｉ）により放出されるガンマ線の実効線量透過率が低減していることがわかる。
また、例えば、厚さ５ｍｍの鉛板の場合、コバルト（^６０Ｃｏ）、セシウム（^１３７Ｃｓ）、ヨウ素（^１３１Ｉ）により放出されるガンマ線の実効線量透過率は、それぞれ約８２％、約６５％、約３４％である。
そして、厚さ１０ｍｍの鉛板の場合、コバルト（^６０Ｃｏ）、セシウム（^１３７Ｃｓ）、ヨウ素（^１３１Ｉ）により放出されるガンマ線の実効線量透過率は、それぞれ約６５％、約４０％、約１２％である。
さらに、厚さ１５ｍｍの鉛板の場合、コバルト（^６０Ｃｏ）、セシウム（^１３７Ｃｓ）、ヨウ素（^１３１Ｉ）により放出されるガンマ線の実効線量透過率は、それぞれ約５２％、約２５％、約５％である。
これらの結果より、鉛板及び鋼板共に板厚が厚くなるとともに、ガンマ線の実効線量透過率が低減することが確認できる。 FIG. 23 is a diagram showing the relationship between the plate thickness of the lead plate and the steel plate and the effective dose transmittance of gamma rays.
As shown in FIG. 23, it can be seen that the effective dose transmittance of gamma rays emitted by cobalt ( ⁶⁰ Co), cesium ( ¹³⁷ Cs), and iodine ( ¹³¹ I) is reduced by the lead plate and the steel plate.
Further, for example, in the case of 5mm thick lead plate, cobalt ⁽⁶⁰ Co), cesium ⁽¹³⁷ Cs), effective dose transmittance of gamma rays emitted by iodine ⁽¹³¹ I) is about 82%, respectively, about 65% About 34%.
When the lead plate with a thickness of 10 mm, a cobalt ⁽⁶⁰ Co), cesium ⁽¹³⁷ Cs), Iodine effective dose transmittance of gamma rays emitted by the ⁽¹³¹ I) is about 65% and about 40%, about 12%.
Further, if the thickness of 15mm of the lead plate, cobalt ⁽⁶⁰ Co), cesium ⁽¹³⁷ Cs), effective dose transmittance of gamma rays emitted by iodine ⁽¹³¹ I) is about 52% and about 25%, about 5%.
From these results, it can be confirmed that both the lead plate and the steel plate are thicker and the effective dose transmittance of gamma rays is reduced.

そして、厚さ５０ｍｍの鉄板の場合、コバルト（^６０Ｃｏ）、セシウム（^１３７Ｃｓ）、ヨウ素（^１３１Ｉ）により放出されるガンマ線の実効線量透過率は、それぞれ約３６％、約２５％、約１５％である。
コバルト（^６０Ｃｏ）に対する厚さ５０ｍｍの鉄板の実効線量透過率は、厚さ１５ｍｍの鉛板よりも小さい。また、セシウム（^１３７Ｃｓ）に対する厚さ５０ｍｍの鉄板の実効線量透過率は、厚さ１５ｍｍの鉛板と同程度である。そして、ヨウ素（^１３１Ｉ）に対する厚さ５０ｍｍの鉄板の実効線量透過率は、厚さ１０ｍｍの鉛板よりもやや大きい程度である。
これらの結果より、鉛板の厚さ（例えば、５ｍｍ）よりも厚い鉄板（例えば、５０ｍｍ）を用いることにより、鉛板と同様の放射線遮蔽性能を有することがわかる。また、鉛板よりも厚い鋼板は、鉛板を複数枚積層したときの放射線遮蔽性能と同程度の性能を有するため、鉛板を複数枚積層して用いた場合でも、鋼板部分が放射線遮蔽性能の弱部となることはないことが確認できた。
したがって、鉛板１４と、当該鉛板１４よりも厚い角型鋼１３及びフラットバー１５、当該鉛板１４よりも厚い区画用鋼板２５等を含む第１放射線遮蔽板１、第２放射線遮蔽板２及び第３放射線遮蔽板３は、優れた放射線遮蔽性能を有していることがわかる。 When the thickness of 50mm steel plate, cobalt ⁽⁶⁰ Co), cesium ⁽¹³⁷ Cs), effective dose transmittance of gamma rays emitted by iodine ⁽¹³¹ I), respectively about 36%, about 25%, about 15 %.
The effective dose transmittance of an iron plate having a thickness of 50 mm with respect to cobalt ( ⁶⁰ Co) is smaller than that of a lead plate having a thickness of 15 mm. Moreover, the effective dose transmittance of a 50 mm thick iron plate for cesium ( ¹³⁷ Cs) is comparable to that of a 15 mm thick lead plate. The effective dose transmittance of the iron plate having a thickness of 50 mm with respect to iodine ( ¹³¹ I) is slightly larger than that of the lead plate having a thickness of 10 mm.
From these results, it can be seen that by using an iron plate (for example, 50 mm) thicker than the thickness (for example, 5 mm) of the lead plate, the radiation shielding performance is the same as that of the lead plate. In addition, steel plates thicker than lead plates have the same performance as radiation shielding performance when multiple lead plates are laminated, so even when multiple lead plates are laminated, the steel plate portion has radiation shielding performance. It was confirmed that it would not become a weak part of.
Therefore, the first radiation shielding plate 1, the second radiation shielding plate 2 including the lead plate 14, the square steel 13 and the flat bar 15 thicker than the lead plate 14, the partition steel plate 25 thicker than the lead plate 14, and the like. It turns out that the 3rd radiation shielding board 3 has the outstanding radiation shielding performance.

上述した第１放射線遮蔽板１、第２放射線遮蔽板２及び第３放射線遮蔽板３を備えた放射線遮蔽箱１０は、空気浄化装置４によって供給される空気によって与圧されて、内部は大気圧よりも高い気圧を有している。
本実施形態において、放射線遮蔽箱１０の総重量は約８トンであり、例えば、１０トン車両の積載許容荷重の９割以下である。 The radiation shielding box 10 including the first radiation shielding plate 1, the second radiation shielding plate 2, and the third radiation shielding plate 3 described above is pressurized by the air supplied by the air purification device 4, and the inside is atmospheric pressure. Has a higher atmospheric pressure.
In the present embodiment, the total weight of the radiation shielding box 10 is about 8 tons, for example, 90% or less of the allowable loading capacity of a 10-ton vehicle.

上述したように、本発明に係る第１〜第３放射線遮蔽板１〜３は、第１鋼板１１を角型鋼１３及びフラットバー１５で補強するとともに、第１鋼板１１と対向するように第２鋼板１２を配置して、組み立て後の形状を箱型とすることで、剛性を高くすることができる。これにより、第１〜第３放射性遮蔽板の大型化が可能となる。
また、複数の鉛板１４を同一平面上に配置して１つの遮蔽材を形成するため、大きな１枚の鉛板を用いる場合よりも取り扱いが格段に容易になる。そして、複数の鉛板１４を用いるため、第１〜第３放射線遮蔽板１〜３を多様な形状に製作するとともに、様々な大きさに製作することが可能となる。
さらに、各区画内に鉛板１４を配置し、鉛板１４をそれぞれアングル材１６、１７、２４で固定するため、鉛板１４の変形を確実に防止できる。そして、複数の鉛板１４を接合しないので、鉛板１４の設置に手間がかからない。 As described above, the first to third radiation shielding plates 1 to 3 according to the present invention reinforce the first steel plate 11 with the square steel 13 and the flat bar 15, and the second so as to face the first steel plate 11. By arranging the steel plate 12 and making the shape after assembly into a box shape, the rigidity can be increased. Thereby, the enlargement of the 1st-3rd radioactive shielding board is attained.
In addition, since a plurality of lead plates 14 are arranged on the same plane to form one shielding material, handling becomes much easier than when a single large lead plate is used. Since a plurality of lead plates 14 are used, the first to third radiation shielding plates 1 to 3 can be manufactured in various shapes and can be manufactured in various sizes.
Furthermore, since the lead plate 14 is disposed in each section and the lead plate 14 is fixed by the angle members 16, 17 and 24, the deformation of the lead plate 14 can be reliably prevented. And since the some lead plate 14 is not joined, installation of the lead plate 14 does not require an effort.

そして、角型鋼１３又はフラットバー１５と鉛板１４との間には、鉛毛が充填されているため、隙間が生じない。これにより、隙間から放射線が透過することを防止できる。
また、各区画内に鉛板１４を積層可能なので、放射線の強度に応じた遮蔽能力を有する第１〜第３放射線遮蔽板１〜３を容易に製作することができる。 And between the square steel 13 or the flat bar 15, and the lead plate 14, since the lead hair is filled, a clearance gap does not arise. Thereby, it can prevent that a radiation permeate | transmits from a clearance gap.
Moreover, since the lead plate 14 can be laminated | stacked in each division, the 1st-3rd radiation shielding plates 1-3 which have the shielding capability according to the intensity | strength of a radiation can be manufactured easily.

そして、放射線遮蔽箱１０は、第１〜第３放射線遮蔽板１〜３を組み合わせて箱型状に構築されているため、剛性が高い。これにより、放射線遮蔽箱１０の大型化が可能となる。そして、第１〜第３放射線遮蔽板１〜３は上述したように、様々な大きさに対応することができるため、放射線遮蔽箱１０も様々な大きさのものを製作することができる。
また、放射線遮蔽箱１０を組み立てる際に、鉛板１４の接合を要しないので、手間をかけることなく安全に放射線遮蔽箱１０を組み立てることができる。
さらに、第１〜第３放射線遮蔽板１〜３は、第１鋼板１１が外側になるように配置され、且つ互いに隣接する第１〜第３放射線遮蔽板１〜３同士間は密封されているため、放射線遮蔽箱１０は密閉された状態となる。したがって、放射線を含む外気が放射線遮蔽箱１０内に入ってくることがない。 And since the radiation shielding box 10 is constructed in a box shape by combining the first to third radiation shielding plates 1 to 3, the rigidity is high. Thereby, the radiation shielding box 10 can be enlarged. Since the first to third radiation shielding plates 1 to 3 can correspond to various sizes as described above, the radiation shielding box 10 can also be manufactured to various sizes.
Further, since the lead plate 14 does not need to be joined when the radiation shielding box 10 is assembled, the radiation shielding box 10 can be safely assembled without taking time and effort.
Furthermore, the 1st-3rd radiation shielding plates 1-3 are arrange | positioned so that the 1st steel plate 11 may become an outer side, and between 1st-3rd radiation shielding plates 1-3 adjacent to each other is sealed. Therefore, the radiation shielding box 10 is in a sealed state. Therefore, outside air containing radiation does not enter the radiation shielding box 10.

そして、空気浄化装置４を備えているため、浄化された空気を放射線遮蔽箱１０内に供給することができる。また、空調装置５を備えているため、放射線遮蔽箱１０内を快適な温度に保つことができる。
また、放射線遮蔽箱１０内の気圧を大気圧よりも高くすることで、万が一、放射線遮蔽箱１０に外気と通じる隙間が形成されていても、放射線を含む外気が放射線遮蔽箱１０内に入ることを防止できる。
また、第２放射線遮蔽板２は、第１鋼板１１に開口２１を有しているため、放射線物質を浄化する空気浄化装置４から供給される空気を送給するための送給管や空調装置５の電源ケーブル等をこの開口２１に挿通させることができる。さらに、開口２１が形成されている区画には、鉛板１４よりも厚い区画用鋼板２３が設けられているため、放射線の透過を防止することができる。
また、第３放射線遮蔽板３は、第１鋼板１１及び第２鋼板１２にそれぞれ扉３０用の開口３１、３２を有しているため、人が放射線遮蔽箱１０に出入りすることができる。 Since the air purification device 4 is provided, the purified air can be supplied into the radiation shielding box 10. Moreover, since the air conditioner 5 is provided, the inside of the radiation shielding box 10 can be kept at a comfortable temperature.
In addition, by setting the atmospheric pressure in the radiation shielding box 10 to be higher than the atmospheric pressure, even if a gap communicating with the outside air is formed in the radiation shielding box 10, outside air containing radiation enters the radiation shielding box 10. Can be prevented.
Moreover, since the 2nd radiation shielding plate 2 has the opening 21 in the 1st steel plate 11, the feed pipe and air conditioner for feeding the air supplied from the air purification apparatus 4 which purify | cleans a radioactive substance 5 power cables or the like can be inserted into the opening 21. Furthermore, since the section steel plate 23 thicker than the lead plate 14 is provided in the section in which the opening 21 is formed, the transmission of radiation can be prevented.
Moreover, since the 3rd radiation shielding plate 3 has the opening 31 and 32 for doors 30 in the 1st steel plate 11 and the 2nd steel plate 12, respectively, a person can go in and out of the radiation shielding box 10. FIG.

さらに、放射線遮蔽箱１０の総重量を運搬車両の積載許容荷重の９割以下とすることにより、放射線遮蔽箱１０を運搬車両で運搬することができる。また、９割以下とすることで、他の装置等も放射線遮蔽箱１０と同時に運搬車両に積載して運搬することができる。 Furthermore, by setting the total weight of the radiation shielding box 10 to 90% or less of the allowable load of the transportation vehicle, the radiation shielding box 10 can be transported by the transportation vehicle. Moreover, by setting it to 90% or less, other devices and the like can be transported while being loaded on the transport vehicle simultaneously with the radiation shielding box 10.

なお、本実施形態では、扉３０を含む第３放射線遮蔽板３を備えた放射線遮蔽箱１０を用いた場合について説明したが、これに限定されるものではなく、放射線管理区域内において、人の出入りを許容しない場合には、第１放射線遮蔽板１及び第２放射線遮蔽板２からなる放射線遮蔽箱１０を用いてもよい。係る場合には、まず、第１放射線遮蔽板１を上壁、底壁、及び３箇所の側壁として組み立て、次に、人が入った状態で、第２放射線遮蔽板２を側壁として各第１放射線遮蔽板１に接合し、その後、現場へ運搬等する。そして、作業が終了したら、安全な場所へ放射線遮蔽箱１０を移動させて、側壁の第２放射線遮蔽板２を取り外すこととなる。 In addition, although this embodiment demonstrated the case where the radiation shielding box 10 provided with the 3rd radiation shielding board 3 containing the door 30 was used, it is not limited to this, In a radiation management area, a person's When entry / exit is not allowed, a radiation shielding box 10 including the first radiation shielding plate 1 and the second radiation shielding plate 2 may be used. In such a case, first, the first radiation shielding plate 1 is assembled as an upper wall, a bottom wall, and three side walls, and then in a state where a person enters, each first radiation shielding plate 2 is used as a side wall. It is joined to the radiation shielding plate 1 and then transported to the site. When the work is completed, the radiation shielding box 10 is moved to a safe place, and the second radiation shielding plate 2 on the side wall is removed.

なお、本実施形態では、第１鋼板１１と角型鋼１３とを全周溶接で密閉する方法について説明したが、これに限定されるものではなく、第１鋼板１１と角型鋼板１３との間にシール材を配置し、第１鋼板１１を角型鋼板１３にボルトないしは断続溶接で固定して、第１鋼板１１と角型鋼１３とを密閉してもよい。要は、第１鋼板１１と角型鋼１３との間に隙間が無いように密閉されていればよい。 In addition, although this embodiment demonstrated the method of sealing the 1st steel plate 11 and the square steel 13 by all-around welding, it is not limited to this, Between the 1st steel plate 11 and the square steel plate 13 The first steel plate 11 and the square steel 13 may be hermetically sealed by disposing the first steel plate 11 to the square steel plate 13 by bolts or intermittent welding. In short, what is necessary is just to be sealed so that there is no gap between the first steel plate 11 and the square steel 13.

１第１放射線遮蔽板
２第２放射線遮蔽板
３第３放射線遮蔽板
４空気浄化装置
５空調装置
１０放射線遮蔽箱
１１第１鋼板
１１ａ外周側面
１２第２鋼板
１２ａ外周側面
１３角型鋼
１４鉛板
１５フラットバー
１６第１アングル
１７第２アングル
１９開口
２１開口
２２切欠き
２３開口
２４第３アングル
２５区画用鋼板
３０扉
３１開口
３２開口 DESCRIPTION OF SYMBOLS 1 1st radiation shielding plate 2 2nd radiation shielding plate 3 3rd radiation shielding plate 4 Air purification apparatus 5 Air conditioner 10 Radiation shielding box 11 1st steel plate 11a Outer peripheral side 12 Second steel plate 12a Outer peripheral side 13 Square steel 14 Lead plate 15 Flat bar 16 1st angle 17 2nd angle 19 Opening 21 Opening 22 Notch 23 Opening 24 Third angle 25 Partition steel plate 30 Door 31 Opening 32 Opening

Claims

A radiation shielding plate for shielding radiation,
A first steel plate;
A frame member provided over the entire outer periphery of the outer peripheral edge of the first steel plate;
A partition material for partitioning the first steel plate surrounded by the frame material into a plurality of sections;
A lead plate installed in each compartment;
One end is connected to either the frame member or the partition member, and a fixing member that fixes the lead plate in each section;
A second steel plate disposed so as to face the first steel plate and closing at least one of the sections, and
A radiation shielding plate, wherein the space between the first steel plate and the frame member is sealed.

2. The radiation shielding plate according to claim 1, wherein lead hair is filled between the frame member or the partition member and the lead plate so as not to cause a gap.

The radiation shielding plate according to claim 1, wherein a plurality of the lead plates can be stacked in each of the compartments.

The partition material is made of steel,
The second steel plate has an opening at a position where it comes into contact with the partition material,
The radioactive shielding plate according to any one of claims 1 to 3, wherein the second steel plate and the partition member are welded to each other in the opening of the second steel plate.

The first steel plate has an opening,
The section of the first steel plate in which the opening is formed is characterized in that a steel plate thicker than the lead plate is installed instead of the lead plate at a location avoiding the opening. The radioactive shielding board as described in any one of 1-4.

The first steel plate has an opening,
The second steel plate has an opening having the same shape as the opening of the first steel plate at a position facing the opening of the first steel plate,
5. The openable / closable door is provided in the section in which the opening of the first steel plate and the opening of the second steel plate are formed. The radioactive shielding board as described in.

It is constructed in a box shape by combining the radiation shielding plate according to any one of claims 1 to 5 and the radiation shielding plate according to claim 6.
A radiation shielding box, wherein the radiation shielding plates adjacent to each other are sealed.

It is constructed in a box shape by combining a plurality of radiation shielding plates according to any one of claims 1 to 5,
A radiation shielding box, wherein the radiation shielding plates adjacent to each other are sealed.

Equipped with an air purification device to purify radioactive materials,
The radiation shielding box according to claim 7 or 8, wherein the radiation shielding box is pressurized by air supplied by the air purifying device and has an inside pressure higher than atmospheric pressure.

Each radiation shielding plate is arranged such that the first steel plate is on the outside,
The radiation shielding box according to any one of claims 7 to 9, wherein the first steel plate and the frame member are sealed.