JP2014142312A - Radioactive material removing method, and coating material - Google Patents
Radioactive material removing method, and coating material Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000012857 radioactive material Substances 0.000 title claims abstract description 15
- 239000011248 coating agent Substances 0.000 title abstract description 22
- 238000000576 coating method Methods 0.000 title abstract description 22
- 239000000463 material Substances 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 230000002427 irreversible effect Effects 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000003973 paint Substances 0.000 claims description 50
- 239000000941 radioactive substance Substances 0.000 claims description 33
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 229910052792 caesium Inorganic materials 0.000 description 13
- 230000002285 radioactive effect Effects 0.000 description 13
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 12
- 238000001035 drying Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000005202 decontamination Methods 0.000 description 6
- 230000003588 decontaminative effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 150000001768 cations Chemical class 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010008428 Chemical poisoning Diseases 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- -1 cesium ions Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
本発明は、放射性物質の除去方法および塗料に関し、特に、建屋等の工作物の表面に付着した放射性セシウムなどの放射性物質を、ストリッパブルペイントなどの剥離性塗料を用いて除去する方法およびその塗料に関するものである。 TECHNICAL FIELD The present invention relates to a method for removing a radioactive substance and a paint, and in particular, a method for removing a radioactive substance such as radioactive cesium adhering to the surface of a workpiece such as a building using a peelable paint such as a strippable paint and the paint. It is about.
従来、原子力施設での放射性物質の漏洩を伴う災害事故としては、スリーマイル島原子力発電所（アメリカ）やチェルノブイリ原子力発電所（旧ソビエト連邦）における事故が有名である。 Conventionally, as accidents involving radioactive material leakage at nuclear facilities, accidents at Three Mile Island nuclear power plant (USA) and Chernobyl nuclear power plant (former Soviet Union) are well known.
放射性物質の漏洩が発生した施設周辺では大量の放射性物質が拡散しているので、周辺地域では建屋等の工作物をはじめとした土壌、樹木、田畑等が放射性物質で汚染されている。 Since a large amount of radioactive material is diffused around the facility where the leakage of radioactive material occurred, soil, trees, fields, etc. including buildings such as buildings are contaminated with radioactive material in the surrounding area.
汚染の主要核種は、核分裂生成物としての放射性セシウム（Ｃｓ−１３４、Ｃｓ−１３７）である。Ｃｓ−１３７は半減期が約３０年と長く、長期間放射線を放出し、大量被曝のおそれから住民がその場所で生活することはできない。そのため、早急かつ安全に除染することができる効果的な技術が従来より求められていた。 The main nuclide of contamination is radioactive cesium (Cs-134, Cs-137) as a fission product. Cs-137 has a long half-life of about 30 years, emits radiation for a long period of time, and inhabitants cannot live in the place because of the risk of mass exposure. Therefore, there has been a need for an effective technique that can quickly and safely decontaminate.
一般的に建屋等の工作物の除染方法としては水を使用する方法が多く、例えば高圧洗浄機による洗浄では１分間当たり数十リットルの水を使用する。そのため、その水の回収が困難であることから、放射性物質が含まれた排水が大量に発生し、それを放流せざるを得ない状況もある。さらに、洗浄中に放射性物質を周囲に拡散するため、二次汚染の可能性や作業員の被曝のおそれも生じる。 In general, there are many methods of using water as a decontamination method for a workpiece such as a building. For example, several tens of liters of water per minute is used for cleaning with a high-pressure washer. Therefore, since it is difficult to collect the water, there is a situation where a large amount of waste water containing radioactive substances is generated and must be discharged. Furthermore, since radioactive materials diffuse around during cleaning, there is a possibility of secondary contamination and exposure of workers.
また、上記以外の除去方法として、例えば、特許文献１に示されるように、除染用ガスを汚染物表面に吹き付ける方法や、特許文献２に示されるように、表面を液体の泡で覆うことによる除去方法も知られている。 Moreover, as a removal method other than the above, for example, as shown in Patent Document 1, a method of spraying a decontamination gas on the surface of a contaminant, or as shown in Patent Document 2, the surface is covered with liquid bubbles. The removal method by is also known.
さらに、上記以外の水を使わない除去方法として、ストリッパブルペイントと呼ばれる剥離性塗料を表面に塗布して乾燥硬化後にその塗膜を剥離することで、放射性物質を除去する方法も知られている。従来のストリッパブルペイントは、水溶性のものと溶剤が多量に含まれるものとに大別され、それぞれ次のような問題がある。 Further, as a removal method that does not use water other than the above, there is also known a method of removing radioactive substances by applying a peelable paint called strippable paint to the surface and removing the coating film after drying and curing. . Conventional strippable paints are roughly classified into those that are water-soluble and those that contain a large amount of solvent, and each has the following problems.
まず、水溶性のストリッパブルペイントの場合には、有機溶剤中毒予防規則で規制される物質が含まれていたり、消防法上の可燃物等が含まれていないため、取り扱いが容易であるが、乾燥後に再度水に濡れてしまうと溶解してしまう性質がある。そのため、屋外での使用には配慮が必要であり、気温が低い季節では夜間に塗布表面が結露し、硬化しない可能性がある。 First, water-soluble strippable paints are easy to handle because they contain substances regulated by the organic solvent poisoning prevention regulations, and do not contain flammables under the Fire Service Act. It has the property of dissolving when it gets wet again after drying. For this reason, consideration is required for outdoor use, and in the season when the temperature is low, the coating surface may condense at night and may not harden.
次に、溶剤系のストリッパブルペイントの場合には、硬化も早く被膜も硬く作業性は良好であるが、作業中に有機溶剤が拡散するため環境汚染し、作業には有機溶剤作業主任者の専任が必要であるとともに、消防法上の可燃物となることが多いため保管方法に対する配慮が必要となる。そのため、一般的な活用には配慮が必要である。 Next, in the case of solvent-based strippable paints, the coating is hard and fast, and the workability is good, but the organic solvent diffuses during the work and the environment is polluted. In addition to requiring full-time work, it is often a combustible material under the Fire Service Act, so it is necessary to consider the storage method. Therefore, consideration is necessary for general use.
このため、剥離性塗料の取り扱いが容易で、表面に付着した放射性物質を簡便に除去することができる技術の開発が強く望まれていた。 For this reason, there has been a strong demand for the development of a technique that can easily handle the peelable paint and can easily remove the radioactive substance adhering to the surface.
本発明は、上記に鑑みてなされたものであって、剥離性塗料の取り扱いが容易で、表面に付着した放射性物質を簡便に除去することができる放射性物質の除去方法および塗料を提供することを目的とする。 The present invention has been made in view of the above, and provides a method for removing a radioactive substance and a paint that are easy to handle a peelable paint and can easily remove the radioactive substance attached to the surface. Objective.
上記した課題を解決し、目的を達成するために、本発明の請求項１に係る放射性物質の除去方法は、物体の表面に付着した放射性物質を除去する方法において、放射性物質を吸着可能な粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を前記表面に塗り、一定時間放置して硬化した前記剥離性塗料による途膜を前記表面から剥がすことを特徴とする。 In order to solve the above-mentioned problems and achieve the object, a method for removing a radioactive substance according to claim 1 of the present invention is a method for removing a radioactive substance adhering to the surface of an object. An irreversible water-soluble releasable paint that contains a water-soluble natural mineral and loses its water solubility when cured is applied to the surface, and the film formed by the peelable paint cured by being left for a certain time is peeled off from the surface. And
また、本発明の請求項２に係る放射性物質の除去方法は、上述した請求項１において、前記粘土性天然鉱物はモンモリロナイトからなることを特徴とする。 The method for removing a radioactive substance according to claim 2 of the present invention is characterized in that, in claim 1 described above, the clay natural mineral is made of montmorillonite.
また、本発明の請求項３に係る塗料は、放射性物質を吸着可能な粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の塗料である。 The paint according to claim 3 of the present invention is an irreversible water-soluble paint that contains a clay natural mineral capable of adsorbing radioactive substances and loses water solubility when cured.
本発明に係る放射性物質の除去方法によれば、物体の表面に付着した放射性物質を除去する方法において、放射性物質を吸着可能な粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を前記表面に塗り、一定時間放置して硬化した前記剥離性塗料による途膜を前記表面から剥がすので、剥離性塗料の取り扱いが容易であり、物体の表面に付着した放射性物質を簡便に除去することができるという効果を奏する。 According to the method for removing a radioactive substance according to the present invention, in the method for removing a radioactive substance adhering to the surface of an object, an irreversible that includes a clay natural mineral capable of adsorbing the radioactive substance and loses water solubility when cured. The water-soluble peelable paint is applied to the surface, and the film formed by the peelable paint cured by leaving it for a certain period of time is peeled off from the surface, so that the peelable paint is easy to handle and the radioactive material attached to the surface of the object There is an effect that the substance can be easily removed.
以下に、本発明に係る放射性物質の除去方法および塗料の実施の形態を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。 Embodiments of a method for removing a radioactive substance and a paint according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
本発明に係る放射性物質の除去方法は、放射能汚染した建屋等の工作物（物体）の表面に付着した放射性セシウム（放射性物質）を除去する方法であり、放射性セシウムを吸着可能なモンモリロナイトなどの粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を表面に塗り、一定時間放置して乾燥硬化した途膜を表面から剥がすものである。ここで、剥離性塗料が本発明に係る塗料に相当するものである。 The method for removing a radioactive substance according to the present invention is a method for removing radioactive cesium (radioactive substance) adhering to the surface of a workpiece (object) such as a radioactively contaminated building, such as montmorillonite capable of adsorbing radioactive cesium. An irreversible water-soluble releasable paint that contains clay natural minerals and loses water solubility when cured is applied to the surface, and the dried and cured film is peeled off from the surface by leaving it for a certain period of time. Here, the peelable coating corresponds to the coating according to the present invention.
ここで、本発明の基本的な吸着原理について説明する。本発明では、剥離性塗料に含ませたモンモリロナイトなどの粘土性天然鉱物による陽イオン交換性能を利用して放射性セシウムの吸着を行うものである。 Here, the basic adsorption principle of the present invention will be described. In the present invention, radioactive cesium is adsorbed by utilizing the cation exchange performance of clay natural minerals such as montmorillonite contained in the releasable paint.
粘土性天然鉱物は、自然界に存在する状態においては、その層間にナトリウム、カリウムおよびカルシウムなどの陽イオンが含まれており、このアルカリおよびアルカリ土壌金属の陽イオンは、それ以上に結合力の強い陽イオンに遭遇するとイオン交換が不可逆的に行われる。例えばセシウムイオンは陽イオンに帯電し、ナトリウム、カリウムおよびカルシウムよりも極めて強い結合力を持っているためイオン交換し、取り込まれ、固定され隔離する。したがって、粘土性天然鉱物は放射性セシウムを選択的に吸着することができる。本発明で用いる剥離性塗料は、この放射性セシウム吸着作用を有した機能性成分を多量に配合した剥離性塗料である。 Clay-type natural minerals contain cations such as sodium, potassium and calcium between the layers in the state existing in nature, and these alkali and alkaline soil metal cations have a stronger binding force. When positive ions are encountered, ion exchange is irreversibly performed. For example, cesium ions are charged to cations and have a much stronger binding force than sodium, potassium and calcium, so that they are ion exchanged, taken in, fixed and sequestered. Therefore, the natural clay mineral can selectively adsorb radioactive cesium. The releasable paint used in the present invention is a releasable paint in which a large amount of the functional component having the radioactive cesium adsorption action is blended.
また、本発明では剥離性塗料の取り扱いを容易にするために、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を用いている。本発明で用いる剥離性塗料は、高分子合成樹脂エマルジョンをベースとし、各種機能性成分を配合した剥離性塗料であり、次の（ア）、（イ）の特性を具備するものである。 In the present invention, an irreversible water-soluble peelable paint that loses water solubility when cured is used in order to facilitate handling of the peelable paint. The releasable paint used in the present invention is a releasable paint based on a polymer synthetic resin emulsion and blended with various functional components, and has the following characteristics (a) and (b).
（ア）乾燥後、不可逆性塗膜を形成する特性
乾燥は水分の蒸発により行われるが、乾燥の進行とともに樹脂成分が融着し、耐水性の塗膜を形成する剥離性塗料である。
(A) Properties of forming an irreversible coating film after drying Drying is performed by evaporation of moisture, and is a releasable coating material in which a resin component is fused with the progress of drying to form a water-resistant coating film.
（イ）乾燥後、被着面に対して剥離性を有する特性
塗布後、乾燥する過程において塗膜は体積収縮するが、この過程において収縮圧力によって分散された離型剤が押し出され、乾燥後、被着体と塗膜が離型可能となる剥離性塗料である。
(A) Properties having peelability to the adherend surface after drying Although the coating film shrinks in volume in the process of drying after coating, the release agent dispersed by the shrinkage pressure is pushed out in this process, and after drying The peelable coating material enables the adherend and the coating film to be released.
また、本発明で用いる剥離性塗料は、焼却による減容化が可能な特性をさらに具備するものである。すなわち、剥離（除染）後の塗膜は廃棄物量を減量するために焼却することが可能であり、しかも焼却時に有害物質を飛散することがないものである。 In addition, the peelable paint used in the present invention further has a characteristic that can be reduced by incineration. That is, the coating film after peeling (decontamination) can be incinerated to reduce the amount of waste, and no harmful substances are scattered during incineration.
次に、本発明に係る放射性物質の除去方法の具体的な手順について、図１の概略フロー図を参照しながら説明する。 Next, a specific procedure of the radioactive substance removing method according to the present invention will be described with reference to the schematic flow chart of FIG.
まず、ステップＳ１において、剥離性塗料を工作物の表面に塗布する。ここで、本発明で用いる剥離性塗料は、上述したように放射性セシウムを吸着可能なモンモリロナイトなどの粘土性天然鉱物を含んで構成され、硬化すると水溶性を喪失する不可逆的な水溶性の塗料である。 First, in step S1, a peelable paint is applied to the surface of a workpiece. Here, the releasable paint used in the present invention is an irreversible water-soluble paint that is composed of a clay-like natural mineral such as montmorillonite capable of adsorbing radioactive cesium as described above and loses water solubility when cured. is there.
次に、ステップＳ２において、工作物表面に塗布した剥離性塗料を一定時間放置する。こうすることで、剥離性塗料が乾燥して硬化する。工作物表面に付着している放射性セシウムは、剥離性塗料の持つ上記吸着作用により吸着されることになる。 Next, in step S2, the peelable coating applied to the workpiece surface is left for a certain period of time. By doing so, the peelable paint is dried and cured. The radioactive cesium adhering to the workpiece surface is adsorbed by the adsorbing action of the peelable paint.
次に、ステップＳ３において、剥離性塗料が乾燥・硬化してできた途膜を工作物表面から剥離する。放射性セシウムは塗膜とともに工作物表面から剥離・除去される。 Next, in step S3, the film formed by drying and curing the peelable paint is peeled from the workpiece surface. The radioactive cesium is peeled off and removed from the workpiece surface together with the coating film.
そして最後に、ステップＳ４において、この途膜を折り畳んで焼却等により処分して減容化する。 Finally, in step S4, the membrane is folded and disposed of by incineration or the like to reduce the volume.
このように、本発明の放射性物質の除去方法によれば、放射性物質で汚染した工作物の表面・壁面等に剥離性塗料を塗布し、乾燥後にそれを剥がすだけで壁面等に付着した放射性物質を除去（除染）することができる。特に、剥離性塗料の取り扱いが従来の剥離性塗料に比べて容易であることから、除去作業を簡便に行うことができる。 As described above, according to the method for removing a radioactive substance of the present invention, the radioactive substance adhered to the wall surface or the like by simply applying the peelable paint to the surface / wall surface of the workpiece contaminated with the radioactive substance and removing it after drying. Can be removed (decontaminated). In particular, since the handling of the releasable paint is easier than that of the conventional releasable paint, the removing operation can be easily performed.
また、本発明によれば、以下の（１）〜（３）に示すような効果を得られる。 Moreover, according to this invention, the effect as shown to the following (1)-(3) is acquired.
（１）除染性能に関する効果
本発明を一サイクル程度適用することで、建屋の壁等の表面に付着した放射性物質を概ね１／２以下に低減させることができる。また、高濃度汚染の部分に対しては同じ「塗って、剥がす」作業のサイクルを繰り返すことにより、除染効果を高めることができる。なお、いわゆる厚塗りでは効果向上はあまり見込めない。
(1) Effects related to decontamination performance By applying the present invention for about one cycle, radioactive substances adhering to the surface of a building wall or the like can be reduced to approximately ½ or less. Further, the decontamination effect can be enhanced by repeating the same “painting and peeling” cycle for the high-concentration contaminated portion. In addition, the effect improvement cannot be expected so much by so-called thick coating.
また、除染対象物に水を使用することが困難な場所や、木造等の表面のように平滑でなく、微細な凹凸があるような場合でも液状の剥離性塗料が細かい凹凸に入り込んで放射性物質を吸着し硬化するので、簡便にこれを除染することができる。 In addition, even in places where it is difficult to use water for decontamination objects, or when the surface is not smooth, such as a wooden surface, the liquid releasable paint penetrates into the fine irregularities and is radioactive. Since the substance is adsorbed and cured, it can be easily decontaminated.
（２）法規制に対する効果
取り扱う剥離性塗料が水溶性であるため、有害物や可燃物が含まれておらず、労働安全衛生法の各種規則（有機溶剤中毒予防規則、特定化学物質等予防規則等）や消防法に抵触するおそれがほとんどない。また、剥離性塗料の取り扱いに有機溶剤作業主任者などの特殊な資格は不要である。
(2) Effect on laws and regulations Because the peelable paint to be handled is water-soluble, it does not contain harmful or flammable materials. Etc.) and the Fire Service Law. In addition, special qualifications such as the organic solvent working chief are unnecessary for handling the releasable paint.
（３）作業性に関する効果
「塗って、剥がす」だけの簡単な作業であるため誰でも作業に従事することができる。また、塗布から剥離までの時間としては、例えば１６時間程度（例えば気温２５℃程度の場合）であるため、塗布した翌日には剥がすことができる。さらに、はけ、ローラー、スプレー等の塗装用の器具により容易に塗布作業が可能である。
(3) Effects on workability Anyone can engage in the work because it is a simple work of “painting and peeling”. The time from application to peeling is, for example, about 16 hours (for example, when the temperature is about 25 ° C.), and can be peeled off the next day after application. Furthermore, the coating operation can be easily performed with a painting tool such as a brush, a roller, or a spray.
また、硬化後の剥離作業時に汚染物を拡散することがなく、廃棄物を最小に抑えることが可能である。さらに、硬化前の剥離性塗料は液状物であるため、入墨部分や狭隘部にも簡単に塗布することができる。また、剥離性塗料は水溶性であるが、硬化すると水溶性を喪失する不可逆的な水溶性であるため、硬化後に雨水等が付着しても溶け出すことがない。 In addition, contaminants are not diffused during the peeling operation after curing, and waste can be minimized. Furthermore, since the releasable paint before curing is a liquid material, it can be easily applied to a tattooed portion or a narrow portion. In addition, the peelable paint is water-soluble, but is irreversible water-soluble that loses water-solubility when cured, and therefore does not melt even if rainwater or the like adheres after curing.
上記の実施の形態において、除去対象の放射性物質として放射性セシウムの場合を例にとり説明したが、これに限るものではなく、放射性セシウム以外の他の放射性物質の除去に適用することももちろん可能である。また、粘土性天然鉱物としてモンモリロナイトの場合を例にとり説明したが、これに限るものではなく、除去対象とする放射性物質を吸着可能な特性を有する粘土性天然鉱物であればこれ以外を用いてももちろん構わない。 In the above embodiment, the case where radioactive cesium is used as the radioactive substance to be removed has been described as an example. However, the present invention is not limited to this, and can of course be applied to the removal of radioactive substances other than radioactive cesium. . In addition, the case where montmorillonite is used as an example of the clay mineral has been described, but the present invention is not limited to this. Of course.
以上説明したように、本発明に係る放射性物質の除去方法によれば、物体の表面に付着した放射性物質を除去する方法において、放射性物質を吸着可能な粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を前記表面に塗り、一定時間放置して硬化した前記剥離性塗料による途膜を前記表面から剥がすので、剥離性塗料の取り扱いが容易であり、物体の表面に付着した放射性物質を簡便に除去することができる。 As described above, according to the method for removing a radioactive substance according to the present invention, the method for removing a radioactive substance attached to the surface of an object includes a clay natural mineral capable of adsorbing the radioactive substance, and is water-soluble when cured. An irreversible water-soluble peelable paint is applied to the surface, and the film formed by the peelable paint cured after being left for a certain period of time is peeled off from the surface. The radioactive substance adhering to the surface of can be easily removed.
以上のように、本発明に係る放射性物質の除去方法は、放射能汚染された建屋等の各種被着体を除染するに際し、被着体表面に付着した放射性セシウムなどの放射性物質を、水を使わずにストリッパブルペイントなどの剥離性塗料を用いて除去するのに有用であり、特に、剥離性塗料の取り扱いが容易であることから、放射性物質を簡便に除去するのに適している。 As described above, the method for removing a radioactive substance according to the present invention, when decontaminating various adherends such as buildings that are radioactively contaminated, It is useful for removing using a strippable paint such as strippable paint without using, and in particular, since it is easy to handle the peelable paint, it is suitable for easily removing radioactive substances.
Claims (3)
放射性物質を吸着可能な粘土性天然鉱物を含み、硬化すると水溶性を喪失する不可逆的な水溶性の剥離性塗料を前記表面に塗り、一定時間放置して硬化した前記剥離性塗料による途膜を前記表面から剥がすことを特徴とする放射性物質の除去方法。 In a method for removing radioactive material adhering to the surface of an object,
An irreversible water-soluble peelable paint that contains a clay-like natural mineral capable of adsorbing radioactive materials and loses its water-solubility when cured is applied to the surface. A method for removing a radioactive substance, comprising peeling off the surface.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016128368A (en) * | 2015-01-09 | 2016-07-14 | 日立造船株式会社 | Refractory coating method and refractory |
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| JP2013181846A (en) * | 2012-03-02 | 2013-09-12 | Ibaraki Univ | Radioactive material decontamination solution from structure using water soluble or water-dispersible polymer and radioactive material decontamination method using radioactive material decontamination solution |
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| JPH04500697A (en) * | 1989-05-10 | 1992-02-06 | ニューワステコン インコーポレーテツド | sprayable composition |
| JP2004533499A (en) * | 2001-03-28 | 2004-11-04 | コミツサリア タ レネルジー アトミーク | Polymer film, method for preparing the same, and method for protecting or cleaning the surface using the film |
| JP2013181846A (en) * | 2012-03-02 | 2013-09-12 | Ibaraki Univ | Radioactive material decontamination solution from structure using water soluble or water-dispersible polymer and radioactive material decontamination method using radioactive material decontamination solution |
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| JP2016128368A (en) * | 2015-01-09 | 2016-07-14 | 日立造船株式会社 | Refractory coating method and refractory |
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