JP2013088131A - Cloth for radioactive substance removal and method for removing radioactive substance using the cloth - Google Patents
Cloth for radioactive substance removal and method for removing radioactive substance using the cloth Download PDFInfo
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- JP2013088131A JP2013088131A JP2011225819A JP2011225819A JP2013088131A JP 2013088131 A JP2013088131 A JP 2013088131A JP 2011225819 A JP2011225819 A JP 2011225819A JP 2011225819 A JP2011225819 A JP 2011225819A JP 2013088131 A JP2013088131 A JP 2013088131A
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- adhesive
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- 239000004744 fabric Substances 0.000 title claims abstract description 96
- 239000000941 radioactive substance Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 42
- 230000001070 adhesive effect Effects 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 23
- 230000035699 permeability Effects 0.000 claims abstract description 22
- 229920002472 Starch Polymers 0.000 claims abstract description 11
- 235000019698 starch Nutrition 0.000 claims abstract description 11
- 239000008107 starch Substances 0.000 claims abstract description 11
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 9
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract description 3
- 239000012857 radioactive material Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 13
- 239000000356 contaminant Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 description 20
- 239000000047 product Substances 0.000 description 13
- 238000005202 decontamination Methods 0.000 description 12
- 230000003588 decontaminative effect Effects 0.000 description 12
- 229910052792 caesium Inorganic materials 0.000 description 9
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 9
- 238000001035 drying Methods 0.000 description 9
- 230000002285 radioactive effect Effects 0.000 description 9
- 239000002689 soil Substances 0.000 description 7
- 239000005357 flat glass Substances 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000010454 slate Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009736 wetting Methods 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
本発明は、放射性物質を除去（除染）するための布帛（放射性物質除去用布帛）及び、当該布帛を用いて放射性物質を除去する方法に関するものである。 The present invention relates to a cloth for removing (decontaminating) radioactive substances (a cloth for removing radioactive substances) and a method for removing radioactive substances using the cloth.
これまで、放射性セシウム等の放射性物質により汚染された土壌を除染する方法としては、汚染された土壌を一定の厚さで取り去って、汚染されていない土に置き換えるという方法が行われてきている。しかし、このような方法を実施するには重機が必要で、簡単に実施することが困難であり、土壌の表面層を剥ぎ取る際に、放射性物質が大気中に飛散する恐れがあるので、安全性の点で問題があった。 Until now, as a method of decontaminating soil contaminated with radioactive substances such as radioactive cesium, a method of removing the contaminated soil with a certain thickness and replacing it with uncontaminated soil has been performed. . However, this method requires heavy machinery and is difficult to carry out easily. When stripping the surface layer of soil, radioactive materials may be scattered in the atmosphere. There was a problem in terms of sex.
そこで、本発明者等は、下記の非特許文献１〜３において、汚染された土壌の表面に、粗く平織りにした綿布を被せてポリビニルアルコール（ＰＶＡ）液をかけ、刷毛でならし、十分に乾燥させてから引き剥がすことにより、放射性物質を除去する方法や、汚染された土壌の上に粉状の澱粉を均等にふりかけ、上記綿布を被せてから散水し、刷毛でならし、十分に乾燥させてから引き剥がすことにより、放射性物質を除去する方法を提案した。
しかしながら、このような方法の場合には、ＰＶＡ液や粉状澱粉を均等に散布する必要があり、散布が均一にできないと、放射性物質の除去にムラが生じ、除去効率が低下するという問題点があった。
Therefore, in the following Non-Patent Documents 1 to 3, the present inventors apply a polyvinyl alcohol (PVA) liquid on a contaminated soil surface covered with a coarsely plain cotton cloth, and smooth it with a brush. Method of removing radioactive materials by drying and then peeling off, or evenly sprinkling powdered starch on the contaminated soil, covering with the cotton cloth, spraying water, leveling with a brush, and thoroughly drying We proposed a method for removing radioactive materials by peeling them off.
However, in the case of such a method, it is necessary to spray the PVA liquid and the powdered starch evenly, and if the spraying cannot be performed uniformly, the removal of radioactive substances is uneven and the removal efficiency is lowered. was there.
本発明は、上述の従来技術における問題点を解決し、簡単に放射性物質を除去するのに適した布帛、及び、当該布帛を用いて簡単に、ムラなく放射性物質を除去・回収することができる方法を提供することを課題とする。
本発明者等は、種々検討を行った結果、通気性及び通水性を有する基材布帛に、予め再湿型接着剤を均一に一定量塗布したものを準備し、これを放射性物質により汚染された汚染物の表面に載置し、この上に散水して一定時間放置し、再湿型接着剤の膜を形成させ、引き剥がすことによって、簡単に放射性物質が除去できることを見い出して本発明を完成した。又、本発明者等は、この際、予め汚染物の表面に再湿型接着剤を塗布することにより、アスファルトや瓦等の凹凸のある表面にへばり付いた放射性物質を有効に除去できることも見い出した。
The present invention solves the above-described problems in the prior art, and can easily remove and collect the radioactive material without unevenness by using the fabric suitable for easily removing the radioactive material, and the fabric. It is an object to provide a method.
As a result of various studies, the present inventors prepared a uniform and predetermined amount of a rewet adhesive on a base fabric having air permeability and water permeability, and this was contaminated with radioactive substances. It was found that the radioactive material can be removed easily by sprinkling water on the surface of the contaminated material, leaving it on the surface for a certain period of time, forming a rewet adhesive film, and peeling it off. completed. Further, in this case, the present inventors can effectively remove radioactive substances stuck to uneven surfaces such as asphalt and roof tiles by previously applying a rewet adhesive on the surface of the contaminant. I found it.
本発明の放射性物質除去用布帛は、放射性物質を除去する際に使用される布帛であって、前記布帛が、通気性及び通水性を有しており、当該布帛の少なくとも片面には、再湿型接着剤が乾燥重量で３〜２０ｇ／ｍ２の塗布量にて塗布されており、前記再湿型接着剤が、ポリビニルアルコール、澱粉糊及びポリ酢酸ビニルからなるグループより選ばれたものであることを特徴とする。 The fabric for removing a radioactive substance of the present invention is a cloth used for removing a radioactive substance, and the fabric has air permeability and water permeability, and at least one surface of the fabric has a rewet. The mold adhesive is applied at a dry weight of 3 to 20 g / m 2 , and the rewet adhesive is selected from the group consisting of polyvinyl alcohol, starch paste and polyvinyl acetate. It is characterized by that.
又、本発明は、表面に放射性物質が付着した汚染物から放射性物質を除去するための方法でもあり、当該方法は、
工程ａ：通気性及び通水性を有する基材布帛の少なくとも片面に、ポリビニルアルコール、澱粉糊及びポリ酢酸ビニルからなるグループより選ばれた再湿型接着剤が乾燥重量で３〜２０ｇ／ｍ２の塗布量にて塗布されている放射性物質除去用布帛を準備する工程、及び
工程ｂ：放射性物質が付着した汚染物の表面に、前記放射性物質除去用布帛を前記再湿型接着剤の塗布面が接するようにして載置し、当該布帛に水を散布した後、放置し、水分を蒸発させてから前記布帛を剥離し、放射性物質を除去する工程
を含むことを特徴とする。
The present invention is also a method for removing radioactive material from contaminants with radioactive material attached to the surface, the method comprising:
Step a: A rewet adhesive selected from the group consisting of polyvinyl alcohol, starch paste and polyvinyl acetate on at least one side of a base fabric having air permeability and water permeability is 3 to 20 g / m 2 in dry weight. A step of preparing a radioactive substance removing fabric applied in a coating amount; and a step b: the surface of the contaminated material to which the radioactive substance is adhered and the application surface of the rewet adhesive on the surface of the radioactive substance removing fabric. It is characterized by including a step of placing the substrate in contact with water, spraying water on the cloth, leaving it to stand, evaporating water, peeling the cloth, and removing radioactive substances.
更に、本発明は、上記の特徴を有した放射性物質の除去方法において、前記工程ｂを実施する前に、放射性物質が付着した汚染物の表面に、前記再湿型接着剤を含む溶液を予め塗布することを特徴とするものでもある。 Furthermore, the present invention provides a method for removing a radioactive substance having the above-described features, in which a solution containing the rewet adhesive is preliminarily applied to the surface of a contaminant to which the radioactive substance has adhered before performing the step b. It is also characterized by being applied.
本発明の放射性物質除去用布帛には、予め再湿型接着剤が塗布されており、布帛自体に通気性及び通水性があるので、表面を濡らすことにより再湿型接着剤にタックが生じ、乾燥させた後に引き剥がせば、汚染物の表面に付着した放射性物質を除去することができ、本発明では、当該布帛の上から水を散布するために、放射性物質の大気中への飛散を防止することができ、安全性の点でも優れている。
又、この放射性物質除去用布帛は、予め再湿型接着剤を汚染物の表面に塗布した後に使用しても良く、この場合には、凹凸のある表面を有したアスファルトの表面や、汚染された土壌や、家屋の窓ガラスや瓦等の表面の除染にも好適である。
In the fabric for removing a radioactive substance of the present invention, a rewet-type adhesive is applied in advance, and the fabric itself is breathable and water-permeable, so that the rewet-type adhesive is tacked by wetting the surface, If it is peeled off after drying, the radioactive material adhering to the surface of the contaminant can be removed. In the present invention, in order to disperse water from above the fabric, the radioactive material is scattered in the atmosphere. It can be prevented and is excellent in safety.
In addition, this radioactive substance removing fabric may be used after a re-wet adhesive is applied to the surface of the contaminated material in advance, and in this case, the surface of the asphalt having an uneven surface or a contaminated surface. It is also suitable for decontamination of soil and the surfaces of house windows and roof tiles.
まず、本発明の放射性物質除去用布帛の構成について説明する。
本発明の放射性物質除去用布帛を構成する基材布帛は、再湿型接着剤を塗布することが可能であり、乾燥を阻害しない様に適度な空隙率を保つ必要があり、材質については、綿等の天然繊維であっても、ポリエステル等の合成繊維であってもよく、織物以外に、ニットや不織布等であっても良い。又、通気性及び通水性を有する基材布帛に存在する目の大きさは、散布された水分が蒸発し易いように、目の粗いものが選択され、ポリエステル織物（平織物）では、太さ44〜165dtexの場合、タテヨコの密度が50〜120本／インチ程度のものが好ましく、糸が44dtexよりも細くなると、パディング法では適量の再湿型接着剤（ＰＶＡ糊等）を塗布することが困難となり、糸が165dtexよりも太くなると、空隙率が低くなり、乾燥が阻害される。この際、太さ44〜82dtexの場合には、タテヨコの密度が70〜120本／インチ程度のものが特に好ましく、太さ66〜165dtexの場合には、タテヨコの密度が50〜100本／インチ程度のものが特に好ましい。
又、綿織物（平織物）では、太さ20〜80番手の場合、タテヨコの密度が40〜90本／インチ程度のものが好ましく、太さ20〜60番手の場合には、タテヨコの密度が40〜70本／インチ程度のものが特に好ましく、太さ40〜80番手の場合には、タテヨコの密度が60〜90本／インチ程度のものが特に好ましい。
First, the configuration of the radioactive substance removing fabric of the present invention will be described.
The base fabric constituting the radioactive substance removing fabric of the present invention can be applied with a re-wetting adhesive, and it is necessary to maintain an appropriate porosity so as not to inhibit drying. Natural fibers such as cotton or synthetic fibers such as polyester may be used, and in addition to woven fabric, knit or non-woven fabric may be used. In addition, the size of the eyes present in the base fabric having air permeability and water permeability is selected so that the sprayed water is easily evaporated, and in the case of a polyester fabric (plain fabric), the size is large. In the case of 44 to 165 dtex, it is preferable that the vertical density is about 50 to 120 / inch. When the yarn becomes thinner than 44 dtex, an appropriate amount of rewet adhesive (PVA glue, etc.) can be applied by the padding method. When it becomes difficult and the yarn becomes thicker than 165 dtex, the porosity decreases and drying is hindered. In this case, when the thickness is 44 to 82 dtex, the vertical density is particularly preferably about 70 to 120 lines / inch. When the thickness is 66 to 165 dtex, the vertical density is 50 to 100 lines / inch. A thing of a grade is especially preferable.
In the case of a cotton fabric (plain fabric), when the thickness is 20 to 80, the vertical density is preferably about 40 to 90 / inch. When the thickness is 20 to 60, the vertical density is 40. Those having a thickness of about ~ 70 / inch are particularly preferred, and when the thickness is 40 to 80, those having a density of about 60 to 90 / inch are particularly preferred.
本発明における上記の基材布帛に塗布される再湿型接着剤は、塗布して乾燥を行った後にはベタツキがないが、表面を水で濡らすとタックが生じる接着剤であれば特に限定されないが、ポリビニルアルコール（ＰＶＡ）、澱粉糊、酢酸ビニル系糊等が好ましく、いずれも市販品が利用できる。又、本発明における再湿型接着剤は、ＰＶＡ溶液に澱粉糊を添加・混合されたものであっても良く、この場合、澱粉糊の添加量を変化させることで固まるのに要する時間を適宜調節することができる。
上記基材布帛表面への再湿型接着剤の塗布量は、乾燥重量において３〜２０ｇ／ｍ２の範囲であることが好ましく、より好ましい範囲は３．５〜１０ｇ／ｍ２であり、塗布量が３ｇ／ｍ２未満の場合には、乾燥後の再湿型接着剤層の厚さが薄く、放射性物質の除去率が低下し、逆に、塗布量が２０ｇ／ｍ２を超えると、基材布帛の通気性及び通水性が損なわれ、水が浸透しにくく、水が蒸発しにくくなるので好ましくない。加えて、除染対象物と布帛の接着強度超過により、布帛を剥離する際、布帛の材料破壊が起こったり、接着剤の層間剥離により、除染対象物側へ布帛、再湿型接着剤の未剥離箇所が残り、汚染物の除去にムラができる可能性があり、又、剥離強度が高くなり過ぎることによって布帛を容易に剥離することが困難となり、屋根の上などの高所での作業が危険なものとなる点からも好ましくない。尚、基材布帛の表面に再湿型接着剤を塗布する際の方法は特に限定されるものではなく、パッディング法、浸漬法、スプレー法、その他各種コーティング法が適用できる。
The rewet adhesive applied to the base fabric according to the present invention is not particularly limited as long as it is an adhesive that does not become sticky after being applied and dried, but causes tackiness when the surface is wetted with water. However, polyvinyl alcohol (PVA), starch paste, vinyl acetate paste and the like are preferable, and commercial products can be used for all. Further, the rewet adhesive in the present invention may be one obtained by adding / mixing starch paste to a PVA solution. In this case, the time required for setting by changing the amount of starch paste added is appropriately determined. Can be adjusted.
The amount of the rewet adhesive applied to the surface of the base fabric is preferably 3 to 20 g / m 2 in terms of dry weight, more preferably 3.5 to 10 g / m 2. When the amount is less than 3 g / m 2 , the thickness of the rewet adhesive layer after drying is thin and the removal rate of the radioactive substance is decreased. Conversely, when the coating amount exceeds 20 g / m 2 , The air permeability and water permeability of the base fabric are impaired, and it is not preferable because water hardly permeates and water does not easily evaporate. In addition, when the fabric is peeled off due to excess bonding strength between the object to be decontaminated and the fabric, the material of the fabric is destroyed, or due to the delamination of the adhesive, There is a possibility that unexfoliated parts remain, and unevenness in removing contaminants may occur, and it becomes difficult to easily remove the fabric due to excessively high peel strength. Is also not preferable from the point that becomes dangerous. The method for applying the rewet adhesive to the surface of the base fabric is not particularly limited, and a padding method, a dipping method, a spray method, and other various coating methods can be applied.
次に、表面に放射性物質が付着した汚染物から放射性物質を除去するための本発明の方法について説明する。
最初の工程ａでは、通気性及び通水性を有する基材布帛の少なくとも片面に、ポリビニルアルコール、澱粉糊及びポリ酢酸ビニルからなるグループより選ばれた再湿型接着剤が乾燥重量で３〜２０ｇ／ｍ２の塗布量にて塗布されている放射性物質除去用布帛を準備するが、この際、再湿型接着剤の塗布面は、布帛の片面であっても両面であっても良い。
そして次工程の工程ｂでは、上記の工程ａで作製した放射性物質除去用布帛を、放射性物質が付着した汚染物の表面に、接着剤が塗布された面を下にして載置し、当該布帛に水を均一に散布して再湿型接着剤がタックを示すようにし、一定時間放置して水分を蒸発させた後、汚染物の表面から布帛を剥離し、汚染物の表面に付着した放射性物質を再湿型接着剤により固めて除去する。本発明では、水を散布する際、散布する水の量を、塗布された再湿型接着剤が水を吸収する程度に調整する必要があり、あまり多量の水を散布すると基材布帛から再湿型接着剤が流れ落ちてしまうので注意する必要がある。
Next, the method of the present invention for removing radioactive materials from contaminants with radioactive materials attached to the surface will be described.
In the first step a, a rewet adhesive selected from the group consisting of polyvinyl alcohol, starch paste and polyvinyl acetate is applied on at least one side of a base fabric having air permeability and water permeability in a dry weight of 3 to 20 g / A fabric for removing a radioactive substance applied at an application amount of m 2 is prepared. At this time, the application surface of the rewet adhesive may be one side or both sides of the fabric.
In step b of the next step, the radioactive substance removing fabric produced in the above step a is placed on the surface of the contaminated material to which the radioactive substance is attached with the surface coated with the adhesive facing down. Sprinkle water evenly to allow the rewet adhesive to tack, leave it for a certain period of time to evaporate the moisture, then peel off the fabric from the surface of the contaminated material and adhere to the surface of the contaminated material The material is solidified and removed with a rewet adhesive. In the present invention, when water is sprayed, it is necessary to adjust the amount of water sprayed to such an extent that the applied rewet adhesive absorbs water. Care must be taken because the wet adhesive will run off.
本発明では、放射性物質の除去効率を高めるために、放射性物質除去用布帛を載置する前に、予め汚染物の表面に再湿型接着剤を塗布しておくことが好ましく、汚染物の表面に再湿型接着剤を直接塗布することにより、凹凸のある表面を有したアスファルトの表面や、汚染された家屋の窓ガラスや瓦等の表面に入り込んだ放射性物質を確実に再湿型接着剤層に取り込むことができ、除去効率を高めることができる。
尚、本発明の方法では、放射性物質で汚染された汚染物の表面を放射性物質除去用布帛で覆い、この上から水を散布するので、埃等が舞い上がるのを防止でき、これにより内部被爆を防止することができる。
以下、本発明の実施例を説明するが、本発明はこれらに限定されるものではない。
In the present invention, in order to increase the removal efficiency of radioactive substances, it is preferable to apply a rewet adhesive to the surface of the contaminant in advance before placing the cloth for removing the radioactive substance. By applying rewet adhesive directly to the surface of the asphalt with uneven surface and contaminated radioactive materials such as window glass and roof tiles of the house are rewet adhesive It can be incorporated into the layer and the removal efficiency can be increased.
In the method of the present invention, the surface of the contaminant contaminated with the radioactive substance is covered with the radioactive substance removing cloth, and water is sprayed from above, so that dust can be prevented from rising, thereby preventing the internal exposure. Can be prevented.
Examples of the present invention will be described below, but the present invention is not limited thereto.
実施例１：本発明の放射性物質除去用布帛の製造例
〔本発明品１の製造〕
通気性及び通水性を有する基材布帛として、市販のポリエステルポンジ（素材：ポリエステル、経緯共に82dtex 32f、密度90本×80本、平織り、目付け90g/m2）を準備し、この基材布帛の片面に、ＰＶＡ水溶液（分子量1500〜3000、濃度８％）をパッディング法により、溶液状態で約60 g/m2コーティングし、120℃にて乾燥を行い、ＰＶＡが乾燥重量で約4.8 g/m2塗布された本発明の放射性物質除去用布帛（本発明品１）を得た。
〔本発明品２の製造〕
通気性及び通水性を有する基材布帛として、市販の寒冷紗（素材：綿、経緯共に40番手、密度60本×60本、平織り）を準備し、この基材布帛の片面に、ＰＶＡ水溶液（分子量1500〜3000、濃度８％）をパッディング法により、溶液状態で約60 g/m2コーティングし、120℃にて乾燥を行い、ＰＶＡが乾燥重量で約4.8 g/m2塗布された本発明の放射性物質除去用布帛（本発明品２）を得た。
Example 1: Production Example of Fabric for Removing Radioactive Substances of the Present Invention [Production of Product 1 of the Present Invention]
As a base fabric having air permeability and water permeability, a commercially available polyester ponge (material: polyester, both of which are 82 dtex 32f, density 90 × 80, plain weave, basis weight 90 g / m 2 ) was prepared. On one side, PVA aqueous solution (molecular weight 1500-3000, concentration 8%) is coated with about 60 g / m 2 in solution by padding method and dried at 120 ° C. PVA is about 4.8 g / dry weight. A fabric for removing a radioactive substance of the present invention coated with m 2 (Product 1 of the present invention) was obtained.
[Production of Invention Product 2]
As a base fabric having air permeability and water permeability, a commercially available cold koji (material: cotton, 40th in both history and density, 60 x 60, plain weave) is prepared, and on one side of this base fabric, an aqueous PVA solution (molecular weight) 1500 to 3000, concentration 8%) is coated with about 60 g / m 2 in a solution state by padding method, dried at 120 ° C., and PVA is applied with a dry weight of about 4.8 g / m 2 A radioactive substance removing fabric (Invention product 2) was obtained.
実施例２：本発明の放射性物質除去用布帛を用いた放射性物質の除去方法の具体例
〔実験Ｎｏ．１〕
福島市内の住宅より入手した窓ガラスの表面に、上記実施例１で作製した本発明の放射性物質除去用布帛（本発明品１）を、接着面が窓ガラス側になるように載置し、当該布帛にスプレーを用いて1m2当たり100mlの水を散布し、ＰＶＡに水を吸収させた後、自然乾燥（日中晴天下で３〜４時間放置）を行い、水分を蒸発させた。その後、窓ガラスから布帛を剥離し、剥離後の布帛に付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．２〕
福島市内の住宅より入手した窓ガラスの表面に、上記実施例１で使用したＰＶＡ水溶液を下塗り材として1m2当たり100g刷毛を用いて塗布し、その表面に、上記実施例１で作製した本発明の放射性物質除去用布帛（本発明品１）を、接着面が窓ガラス側になるように載置し、その後、上記と同様の操作を行い、布帛へ付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．３〕
福島市内の住宅より入手した屋根（スレート）の表面に、上記実施例１で使用したＰＶＡ水溶液を下塗り材として1m2当たり200g刷毛を用いて塗布し、その表面に、市販品のポリエステルポンジ（未処理）を載置し、当該布帛にスプレーを用いて1m2当たり100mlの水を散布し、ＰＶＡに水を吸収させた後、自然乾燥（日中晴天下で３〜４時間放置）を行い、水分を蒸発させた。その後、屋根から布帛を剥離し、剥離後の布帛に付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．４〕
福島市内の住宅より入手した屋根（スレート）の表面に、上記実施例１で作製した本発明の放射性物質除去用布帛（本発明品１）を、接着面が屋根側になるように載置し、その後、上記と同様の操作を行い、布帛へ付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．５〕
福島市内の住宅より入手した屋根（スレート）の表面に、上記実施例１で使用したＰＶＡ水溶液を下塗り材として1m2当たり200g刷毛を用いて塗布し、その表面に、上記実施例１で作製した本発明の放射性物質除去用布帛（本発明品１）を、接着面が屋根側になるように載置し、その後、上記と同様の操作を行い、布帛へ付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．６〕
放射性物質除去用布帛として、上記実施例１で作製した本発明品２を使用する以外、実験Ｎｏ．５と同様の操作を行い、本発明の方法を実施後の布帛へ付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．７〕
福島市内の住宅より入手した屋根瓦の表面に、上記実施例１で使用したＰＶＡ水溶液を下塗り材として1m2当たり200g刷毛を用いて塗布し、その表面に、市販品のポリエステルポンジ（未処理）を載置し、その後、上記と同様の操作を行い、布帛へ付着した放射性セシウムの量を測定した。
〔実験Ｎｏ．８〕
放射性物質除去用布帛として、上記実施例１で作製した本発明の放射性物質除去用布帛（本発明品１）を使用する以外、実験Ｎｏ．７と同様の操作を行い、本発明の方法を実施後の布帛へ付着した放射性セシウムの量を測定した。
上記の実験Ｎｏ．１〜Ｎｏ．８に使用した除染対象物はいずれも、同じ家屋において同じ条件に曝されていたものとした。
尚、除染処理後の布帛の放射線量測定には、いずれの場合も、ゲルマニウム検出器（ＣＡＮＢＲＲＡ社製）を使用した。
以下の表１に上記の実験結果を示す。
Example 2: Specific example of a method for removing a radioactive substance using the cloth for removing a radioactive substance of the present invention [Experiment No. 1]
On the surface of the window glass obtained from a house in Fukushima city, the fabric for removing a radioactive substance of the present invention (Product 1 of the present invention) prepared in Example 1 is placed so that the adhesive surface is on the window glass side. Then, 100 ml of water per 1 m 2 was sprayed on the fabric using a spray, and water was absorbed into the PVA, followed by natural drying (for 3 to 4 hours under sunny daytime) to evaporate the water. Thereafter, the fabric was peeled from the window glass, and the amount of radioactive cesium adhering to the peeled fabric was measured.
[Experiment No. 2]
The PVA aqueous solution used in Example 1 above was applied to the surface of a window glass obtained from a house in Fukushima City using 100 g of brush per 1 m 2 as an undercoat, and the book produced in Example 1 above was applied to the surface. The radioactive substance removing fabric of the invention (product 1 of the present invention) was placed so that the adhesive surface was on the window glass side, and then the same operation as described above was performed to measure the amount of radioactive cesium adhering to the fabric. .
[Experiment No. 3]
On the surface of the roof (slate) obtained from a house in Fukushima city, the PVA aqueous solution used in Example 1 above was applied as a primer with a 200 g brush per 1 m 2 , and a commercially available polyester sponge ( Untreated), spray 100ml of water per 1m 2 on the fabric using a spray, absorb the water in PVA, and then dry naturally (leave for 3-4 hours under clear daylight) The water was evaporated. Thereafter, the fabric was peeled from the roof, and the amount of radioactive cesium adhering to the peeled fabric was measured.
[Experiment No. 4]
The fabric for removing a radioactive substance of the present invention (Product 1 of the present invention) produced in Example 1 is placed on the surface of a roof (slate) obtained from a house in Fukushima city so that the adhesive surface is on the roof side. Thereafter, the same operation as described above was performed, and the amount of radioactive cesium adhering to the fabric was measured.
[Experiment No. 5]
The surface of the roof (slate) obtained from a house in Fukushima city is coated with the PVA aqueous solution used in Example 1 above as a primer, using 200 g of brush per 1 m 2 , and the surface is prepared in Example 1 above. The radioactive material removing fabric of the present invention (Product 1 of the present invention) was placed so that the adhesive surface was on the roof side, and then the same operation as described above was performed to measure the amount of radioactive cesium adhering to the fabric did.
[Experiment No. 6]
Except for using the product 2 of the present invention prepared in Example 1 as the radioactive substance removing fabric, Experiment No. Operation similar to 5 was performed, and the amount of radioactive cesium adhering to the fabric after carrying out the method of the present invention was measured.
[Experiment No. 7]
On the surface of the roof tile which is obtained from Fukushima city housing, the aqueous PVA solution used in Example 1 was coated with a 1 m 2 per 200g brush as a primer material, on its surface, the polyester sponge (unprocessed commercial product Then, the same operation as described above was performed, and the amount of radioactive cesium adhering to the fabric was measured.
[Experiment No. 8]
Except for using the radioactive substance removing fabric of the present invention produced in Example 1 above (invention product 1) as the radioactive substance removing cloth, Experiment No. The same operation as in No. 7 was performed, and the amount of radioactive cesium adhering to the fabric after carrying out the method of the present invention was measured.
In the above experiment No. 1-No. All the decontamination objects used in 8 were exposed to the same conditions in the same house.
In each case, a germanium detector (manufactured by CANBRRA) was used for measuring the radiation dose of the fabric after the decontamination treatment.
The experimental results are shown in Table 1 below.
実験Ｎｏ．１と実験Ｎｏ．２の結果からわかるように、表面が平滑なガラスの様な素材に対しては、下塗り材を塗布しなくても本発明品を用い、適量の水を噴霧することで、十分な除染性能が得られることがわかる。
実験Ｎｏ．３では、凹凸のある表面に対して、本発明品に処理（塗布）されている量よりも多い、ＰＶＡ液の下塗りを行ったが、十分な接着強力は得られず、乾燥後生地は剥がれ落ちた。剥がれ落ちた生地の測定を行ったが、測定値は検出限界以下（0.1Bq/m2以下）であった。
実験Ｎｏ．４の結果からわかるように、予めＰＶＡ糊を生地に処理することにより、スレートの様な凹凸のある表面に対しても、布帛は接着し除染性能が得られる。
また実験Ｎｏ．５と実験Ｎｏ．６の結果からわかるように、凹凸のある表面に対しては、ＰＶＡ糊の下塗りと本発明品を組み合わせることにより、除染性能は飛躍的に向上することがわかる。
実験Ｎｏ．７では、実験Ｎｏ．３とは異なり、十分な接着力が得られ除染性能が見られるが、本発明品を用いた実験Ｎｏ．８では除染性能はさらに約２０％向上した。
Experiment No. 1 and Experiment No. As can be seen from the result of 2, the material such as glass with a smooth surface can be sufficiently decontaminated by spraying an appropriate amount of water using the product of the present invention without applying a primer. It can be seen that
Experiment No. In No. 3, the PVA liquid was primed more than the amount processed (applied) on the uneven surface, but sufficient adhesive strength was not obtained, and the fabric was peeled off after drying. fell. The cloth that was peeled off was measured, but the measured value was below the detection limit (0.1 Bq / m 2 or less).
Experiment No. As can be seen from the result of No. 4, by treating the fabric with PVA glue in advance, the fabric adheres even to an uneven surface such as a slate, and decontamination performance is obtained.
In addition, Experiment No. 5 and Experiment No. As can be seen from the result of 6, the decontamination performance is dramatically improved by combining the undercoat of PVA glue and the product of the present invention on the uneven surface.
Experiment No. In Experiment No. 7, experiment no. Unlike No. 3, sufficient adhesive force is obtained and decontamination performance is observed. In 8, the decontamination performance was further improved by about 20%.
本発明の放射性物質除去用布帛は、除染対象箇所に載置して水を噴霧し、乾燥させてから剥離することにより簡単に放射性物質を除去することができ、平滑な表面部分だけでなく、表面凹凸のある部分に入り込んだ放射性物質の除染にも有用である。 The radioactive substance removing fabric of the present invention can be easily removed by placing it on a decontamination target area, spraying water, drying it, and then peeling it off. It is also useful for decontamination of radioactive materials that have entered the surface with irregularities.
Claims (3)
工程ａ：通気性及び通水性を有する基材布帛の少なくとも片面に、ポリビニルアルコール、澱粉糊及びポリ酢酸ビニルからなるグループより選ばれた再湿型接着剤が乾燥重量で３〜２０ｇ／ｍ２の塗布量にて塗布されている放射性物質除去用布帛を準備する工程、及び
工程ｂ：放射性物質が付着した汚染物の表面に、前記放射性物質除去用布帛を前記再湿型接着剤の塗布面が接するようにして載置し、当該布帛に水を散布した後、放置し、水分を蒸発させてから前記布帛を剥離し、放射性物質を除去する工程
を含むことを特徴とする放射性物質の除去方法。 A method for removing radioactive material from contaminants with radioactive material attached to a surface, the method comprising:
Step a: A rewet adhesive selected from the group consisting of polyvinyl alcohol, starch paste and polyvinyl acetate on at least one side of a base fabric having air permeability and water permeability is 3 to 20 g / m 2 in dry weight. A step of preparing a radioactive substance removing fabric applied in a coating amount; and a step b: the surface of the contaminated material to which the radioactive substance is adhered and the application surface of the rewet adhesive on the surface of the radioactive substance removing fabric. A method for removing a radioactive substance comprising the steps of placing the substrate in contact with the cloth, spraying water on the cloth, leaving the cloth to evaporate the moisture and then peeling the cloth to remove the radioactive substance .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011225819A JP2013088131A (en) | 2011-10-13 | 2011-10-13 | Cloth for radioactive substance removal and method for removing radioactive substance using the cloth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011225819A JP2013088131A (en) | 2011-10-13 | 2011-10-13 | Cloth for radioactive substance removal and method for removing radioactive substance using the cloth |
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| JP2013088131A true JP2013088131A (en) | 2013-05-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014205024A1 (en) | 2013-04-19 | 2014-10-23 | Fujitsu Ten Ltd. | RADAR EQUIPMENT AND SIGNAL PROCESSING METHOD |
| KR102091344B1 (en) * | 2019-01-21 | 2020-03-19 | 류길수 | Multilayer sheet for radiation shielding and adhesive special paper comprising the same |
-
2011
- 2011-10-13 JP JP2011225819A patent/JP2013088131A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014205024A1 (en) | 2013-04-19 | 2014-10-23 | Fujitsu Ten Ltd. | RADAR EQUIPMENT AND SIGNAL PROCESSING METHOD |
| KR102091344B1 (en) * | 2019-01-21 | 2020-03-19 | 류길수 | Multilayer sheet for radiation shielding and adhesive special paper comprising the same |
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