JPH05157892A - Radiation shielding member recovery method - Google Patents
Radiation shielding member recovery methodInfo
- Publication number
- JPH05157892A JPH05157892A JP31917691A JP31917691A JPH05157892A JP H05157892 A JPH05157892 A JP H05157892A JP 31917691 A JP31917691 A JP 31917691A JP 31917691 A JP31917691 A JP 31917691A JP H05157892 A JPH05157892 A JP H05157892A
- Authority
- JP
- Japan
- Prior art keywords
- water
- radiation
- radiation shielding
- metal salt
- shielding material
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、放射線を発生する設
備、例えば原子炉、粒子線加速器、医療機器、分析機器
等に用いる放射線遮蔽材を、繰り返し再利用するべく回
収する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of retrieving radiation shielding materials used in facilities for generating radiation, such as nuclear reactors, particle beam accelerators, medical instruments, analytical instruments, etc., for repeated reuse.
【０００２】[0002]
【従来の技術】近年、放射線を発生する設備、機器は種
々の分野で使用されているが、これらの設備、機器に用
いる放射線遮蔽体もいくつか提案されている。例えば、
中性子吸収物質を高温加圧下に溶解してなる遮蔽体（特
開昭５１−４８０９９）、流動性の中性子遮蔽材（特公
昭３７−１８４５０）、中性子吸収剤を透明ゲルで固定
化した遮蔽材（特公昭５２−４９５５６）等が公知であ
る。2. Description of the Related Art In recent years, radiation-generating facilities and equipment have been used in various fields, and some radiation shields used in these facilities and equipment have been proposed. For example,
A shield made by melting a neutron absorbing substance under high temperature and pressure (Japanese Patent Laid-Open No. 51-48099), a fluid neutron shielding material (Japanese Patent Publication No. 37-18450), and a shielding material in which a neutron absorbing material is immobilized by a transparent gel ( JP-B-52-49556) and the like are known.
【０００３】[0003]
【発明が解決しようとする課題】従来、これら放射線遮
蔽体は一定期間使用された後、設備、機器が更新、改
造、廃棄される時は、新しい設備、機器に用いられる事
なく廃棄されるのが一般であった。しかしながら、使用
後の汚染された遮蔽体の廃棄は、廃棄処理自体に多大の
費用を要するのみならず、遮蔽体に用いる高価な放射線
遮蔽材を使い捨てする事になり、省資源の面でも問題が
あった。Conventionally, when these radiation shields have been used for a certain period of time and then facilities, equipment are renewed, modified, or discarded, they are discarded without being used for new equipment or equipment. Was common. However, discarding the contaminated shield after use not only requires a great deal of cost for the disposal process itself, but also disposes of an expensive radiation shield used for the shield, which causes a problem in terms of resource saving. there were.
【０００４】本発明は、上記の問題を解決するものであ
り、従って本発明の目的は、使用後の放射線遮蔽材を、
繰り返し使用するべく回収する方法を提供する事にあ
る。The present invention solves the above problems, and it is therefore an object of the present invention to provide a radiation shield after use.
It is to provide a method of collecting for repeated use.
【０００５】[0005]
【課題を解決する為の手段】上記目的は、吸水性樹脂、
水及び放射線遮蔽材とからなり、放射線を吸収した後の
放射線遮蔽体に、金属塩を添加し前記放射線遮蔽体から
水を分離除去する事よりなる放射線遮蔽材の回収方法に
より達成される。[Means for Solving the Problems] The above-mentioned objects are
This is achieved by a method of collecting a radiation shielding material, which comprises water and a radiation shielding material, and a metal salt is added to the radiation shielding material after absorbing radiation to separate and remove water from the radiation shielding material.
【０００６】本発明における放射線遮蔽体の一成分たる
吸水性樹脂は、水性液体を吸収する事によって水膨潤ゲ
ルを形成しうる高分子化合物であり、通常、水溶性不飽
和単量体及び／又は加水分解により水溶性となる不飽和
単量体を重合する事により得る事が出来る。この様な吸
水性樹脂としては、例えばポリアクリル酸塩架橋体、イ
ソブチレン−マレイン酸塩共重合体、デンプン−アクリ
ル酸グラフト重合体、酢酸ビニル−アクリル酸塩共重合
架橋体等を挙げることができる。これら合成の高分子化
合物以外に、例えば寒天、アルギン酸、カラギ−ナン、
マンナン、ゼラチン、グルテン等の如き天然系多糖類及
び蛋白等の天然高分子化合物も有効である。吸水性樹脂
は粉体をそのまま用いてもよいが、不職布等の繊維質基
材に固定化した吸水性シ−トの形態で用いてもよい。吸
水性樹脂に水を添加するに際し、添加する水の量は特に
制限されるものではないが、用いる吸水性樹脂の最大吸
水能力未満の量とするのが好適であり、より好ましく
は、吸水性樹脂１００重量部当り５０〜１０００００重
量部である。The water-absorbent resin, which is one component of the radiation shield of the present invention, is a polymer compound capable of forming a water-swelling gel by absorbing an aqueous liquid, and is usually a water-soluble unsaturated monomer and / or It can be obtained by polymerizing an unsaturated monomer which becomes water-soluble by hydrolysis. Examples of such a water-absorbent resin include polyacrylate cross-linked products, isobutylene-maleate copolymers, starch-acrylic acid graft polymers, vinyl acetate-acrylate copolymer cross-linked products, and the like. .. In addition to these synthetic polymer compounds, for example, agar, alginic acid, carrageenan,
Natural polymer compounds such as natural polysaccharides and proteins such as mannan, gelatin and gluten are also effective. As the water absorbent resin, powder may be used as it is, or may be used in the form of a water absorbent sheet fixed to a fibrous base material such as unwoven cloth. When adding water to the water-absorbent resin, the amount of water to be added is not particularly limited, it is suitable to be less than the maximum water-absorbing capacity of the water-absorbent resin used, more preferably, water-absorbing It is 50 to 100,000 parts by weight per 100 parts by weight of the resin.
【０００７】本発明における放射線遮蔽材は、当業者に
周知の、放射線を遮蔽する為に使用される材料のことで
あり、その特性は、例えば物理学辞典（昭和６１年１０
月２０日 培風館発行）に記載されている。この様な放
射線遮蔽材としては、例えばホウ素、鉄、鉛、カドミウ
ム、リチウム等の化合物を挙げる事ができる。中でも、
ボロンカ−バイド、ランタンボロン等のホウ素化合物は
中性子線に対する遮蔽効果が大きく、且つ高価な為に本
発明の方法が有効である。The radiation shielding material in the present invention is a material that is well known to those skilled in the art and is used for shielding radiation, and its characteristics are, for example, in a physics dictionary (10, 1986).
Published by Baifukan on March 20). Examples of such radiation shielding materials include compounds such as boron, iron, lead, cadmium and lithium. Above all,
Boron compounds such as boron carbide and lanthanum boron have a large shielding effect against neutron rays and are expensive, so the method of the present invention is effective.
【０００８】本発明における放射線遮蔽体は、前記吸水
性樹脂、水及び放射線遮蔽材とからなるものであるが、
その配合方法は何等制限されるものではなく、種々の方
法が採用される。例えば、吸水性樹脂に水を添加して水
膨潤ゲルとした後放射線遮蔽材を添加し混合する方法、
吸水性樹脂と放射線遮蔽材を混合した後水を添加する方
法、放射線遮蔽材を水に分散したスラリ−液を吸水性樹
脂に添加する方法等が挙げられる。The radiation shield according to the present invention comprises the water absorbent resin, water and a radiation shield,
The compounding method is not limited at all, and various methods are adopted. For example, a method of adding water to a water-absorbent resin to form a water-swelling gel and then adding and mixing a radiation shielding material,
Examples thereof include a method of adding water after mixing the water-absorbent resin and the radiation shielding material, and a method of adding a slurry liquid in which the radiation-shielding material is dispersed in water to the water absorbent resin.
【０００９】本発明は、例えば原子炉、粒子線加速器、
医療機器、分析機器等の放射線を発生する設備に用い放
射線を照射した後の放射線遮蔽体に金属塩を添加し、該
放射線遮蔽体から水を分離除去する事により達成され
る。The present invention can be applied to, for example, a nuclear reactor, a particle beam accelerator,
This can be achieved by adding a metal salt to the radiation shield after irradiation with radiation used in equipment for generating radiation such as medical equipment and analytical equipment, and separating and removing water from the radiation shield.
【００１０】用いる金属塩に特に制限はなく、例えば塩
化ナトリウム、塩化カリウム、塩化リチウム、硫酸ナト
リウム、硫酸カリウム、炭酸ナトリウム、炭酸水素ナト
リウム等のアルカリ金属塩；塩化マグネシウム、塩化カ
ルシウム、炭酸カルシウム等のアルカリ土類金属塩；塩
化アルミニウム、塩化鉄、塩化コバルト等の多価金属塩
等が挙げられる。なかでも、アルカリ金属塩及び／又は
アルカリ土類金属塩が好ましく、水溶性の金属塩である
事が特に好ましい。金属塩の水に対する溶解性が低い
と、水の分離除去に長時間を要する場合がある。The metal salt to be used is not particularly limited, and examples thereof include alkali metal salts such as sodium chloride, potassium chloride, lithium chloride, sodium sulfate, potassium sulfate, sodium carbonate and sodium hydrogen carbonate; magnesium chloride, calcium chloride, calcium carbonate and the like. Alkaline earth metal salts; polyvalent metal salts such as aluminum chloride, iron chloride, cobalt chloride and the like can be mentioned. Of these, alkali metal salts and / or alkaline earth metal salts are preferable, and water-soluble metal salts are particularly preferable. When the solubility of the metal salt in water is low, it may take a long time to separate and remove water.
【００１１】金属塩の使用量は特に限定されず広い範囲
とする事ができるが、水に対する金属塩の量が０．１〜
２０重量％の範囲となる量で用いるのが好ましい。０．
１重量％未満では水の分離効率が低く、２０重量％を越
えると放射線遮蔽剤の回収が困難となる場合がある。The amount of the metal salt used is not particularly limited and may be in a wide range, but the amount of the metal salt to water is 0.1 to 0.1.
It is preferably used in an amount in the range of 20% by weight. 0.
If it is less than 1% by weight, the separation efficiency of water is low, and if it exceeds 20% by weight, it may be difficult to collect the radiation shielding agent.
【００１２】本発明の典型的な実施態様は、例えば汚染
された前記放射線遮蔽体と金属塩とを水中で撹拌して充
分混合した後、濾過等の適当な手段により水を放射線遮
蔽体から分離除去する方法により代表される。水中で混
合する際の手順や濾過の方法等は当業者の周知の方法に
依れば良い。汚染された放射線遮蔽体と金属塩とを水中
で撹拌して充分混合した後、その液を放置すると通常最
上部から水、吸水性樹脂、放射線遮蔽材の順に三層に分
離するので、水だけを分離除去して放射線遮蔽材を吸水
性樹脂と共に回収して放射線遮蔽体に再利用しても良
く、又は、水及び吸水性樹脂を分離除去して放射線遮蔽
材だけを回収して放射線遮蔽体に再利用しても良い。In a typical embodiment of the present invention, for example, the contaminated radiation shield and the metal salt are stirred in water and thoroughly mixed, and then the water is separated from the radiation shield by a suitable means such as filtration. It is represented by the method of removal. The procedure for mixing in water, the method of filtration and the like may be based on the method well known to those skilled in the art. After agitating the contaminated radiation shield and metal salt in water and mixing them well, if the liquid is left to stand, water, water-absorbent resin and radiation shield are usually separated into three layers in that order, so only water May be separated and removed to collect the radiation shielding material together with the water absorbing resin and reused in the radiation shielding body, or the water and water absorbing resin may be separated and removed to collect only the radiation shielding material and the radiation shielding body. You may reuse it.
【００１３】回収した放射線遮蔽材は原子炉、粒子線加
速器、医療機器、分析機器等の放射線遮蔽体に再度使用
する事が出来る。The recovered radiation shielding material can be reused as a radiation shielding body for nuclear reactors, particle beam accelerators, medical instruments, analytical instruments and the like.
【００１４】[0014]
【実施例】以下、実施例を挙げて本発明をより詳細に説
明するが、本発明はこの実施例により制限されるもので
はない。The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００１５】（実施例１）縦０．２ｍ、横０．５ｍ、高
さ０．２ｍのステンレス製放射線遮蔽槽に吸水性樹脂
（アクアリックＣＡ (株)日本触媒製）０．１６ｋｇ及
び脱イオン水１５ｋｇを仕込み、吸水性樹脂の水膨潤ゲ
ルを調整した。そこへ粒子径が１０〜２５０ミクロンの
ボロンカ−バイド（デンカボロンＡ 電気化学工業(株)
製）４ｋｇを添加し、均一に混合されるまで撹拌して放
射線遮蔽体（１）を得た。(Example 1) 0.16 kg of water-absorbent resin (Aquaric CA Co., Ltd. Nippon Shokubai) and deionized in a 0.2 m long, 0.5 m wide, 0.2 m high stainless radiation shielding tank. 15 kg of water was charged to prepare a water-swelling gel of a water-absorbent resin. Boron carbide with a particle size of 10 to 250 microns (Denka Boron A Electrochemical Industry Co., Ltd.)
4 kg) was added, and the mixture was stirred until uniformly mixed to obtain a radiation shield (1).
【００１６】上記手順で得た放射線遮蔽体（１）を充填
した放射線遮蔽槽に、１０6個／ｓｅｃ・ｃｍ2の中性子
線を１２００時間照射した。こうして放射線により汚染
された放射線遮蔽体を放射線遮蔽槽から取り出し、２０
リットルのステンレス製容器中でＮａＣｌを０．３ｋｇ
加え充分撹拌した後静置した所、放射線遮蔽材と吸水性
樹脂が水から分離して下層に沈降した。The radiation shielding tank filled with the radiation shielding body (1) obtained by the above procedure was irradiated with neutron rays of 10 6 / sec · cm 2 for 1200 hours. The radiation shield thus contaminated with radiation is taken out of the radiation shield tank, and
0.3 kg of NaCl in a liter stainless steel container
When the mixture was sufficiently stirred and left to stand still, the radiation shielding material and the water absorbent resin were separated from water and settled in the lower layer.
【００１７】上層の水を除去した後の沈降物は１５ｋｇ
の水で充分洗浄する事により、再び放射線遮蔽体に使用
する事ができた。The sediment after removing the upper water is 15 kg
After being thoroughly washed with the above water, it could be used again as a radiation shield.
【００１８】[0018]
【発明の効果】本発明の方法によって、放射線を発生す
る設備、機器等に用いて汚染された放射線遮蔽体から放
射線遮蔽材を回収する事が可能となった。According to the method of the present invention, it is possible to recover a radiation shielding material from a contaminated radiation shielding body used in equipment, equipment, etc. that generate radiation.
Claims (2)
り、放射線を吸収した後の放射線遮蔽体に、金属塩を添
加し、前記放射線遮蔽体から水を分離除去する事よりな
る放射線遮蔽材の回収方法。1. A radiation shield comprising a water-absorbent resin, water and a radiation shielding material, wherein a metal salt is added to the radiation shielding body after absorbing the radiation, and water is separated and removed from the radiation shielding body. How to collect wood.
ルカリ土類金属塩である請求項１記載の放射線遮蔽材の
回収方法。2. The method for recovering a radiation shielding material according to claim 1, wherein the metal salt is an alkali metal salt and / or an alkaline earth metal salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31917691A JPH05157892A (en) | 1991-12-03 | 1991-12-03 | Radiation shielding member recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31917691A JPH05157892A (en) | 1991-12-03 | 1991-12-03 | Radiation shielding member recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05157892A true JPH05157892A (en) | 1993-06-25 |
Family
ID=18107271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31917691A Pending JPH05157892A (en) | 1991-12-03 | 1991-12-03 | Radiation shielding member recovery method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05157892A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012149988A (en) * | 2011-01-19 | 2012-08-09 | Sanyo Chem Ind Ltd | Composition for preventing radioactive chemical diffusion |
| JP2012225749A (en) * | 2011-04-19 | 2012-11-15 | Noboru Kumazawa | Radiation absorption material |
| JP2016161298A (en) * | 2015-02-26 | 2016-09-05 | 有限会社技研産業 | Method for forming radiation shielding composition, radiation shielding material, or radiation shielding construction material |
| WO2023162500A1 (en) * | 2022-02-25 | 2023-08-31 | 三菱重工業株式会社 | Nuclear reactor shielding facility and method for constructing nuclear power facility and nuclear reactor shielding facility |
-
1991
- 1991-12-03 JP JP31917691A patent/JPH05157892A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012149988A (en) * | 2011-01-19 | 2012-08-09 | Sanyo Chem Ind Ltd | Composition for preventing radioactive chemical diffusion |
| JP2012225749A (en) * | 2011-04-19 | 2012-11-15 | Noboru Kumazawa | Radiation absorption material |
| JP2016161298A (en) * | 2015-02-26 | 2016-09-05 | 有限会社技研産業 | Method for forming radiation shielding composition, radiation shielding material, or radiation shielding construction material |
| WO2023162500A1 (en) * | 2022-02-25 | 2023-08-31 | 三菱重工業株式会社 | Nuclear reactor shielding facility and method for constructing nuclear power facility and nuclear reactor shielding facility |
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