JP3952664B2 - Radiation sensitive composition and dosimeter - Google Patents
Radiation sensitive composition and dosimeter Download PDFInfo
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- JP3952664B2 JP3952664B2 JP2000178581A JP2000178581A JP3952664B2 JP 3952664 B2 JP3952664 B2 JP 3952664B2 JP 2000178581 A JP2000178581 A JP 2000178581A JP 2000178581 A JP2000178581 A JP 2000178581A JP 3952664 B2 JP3952664 B2 JP 3952664B2
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- SIKJAQJRHWYJAI-UHFFFAOYSA-N c1c[nH]c2c1cccc2 Chemical compound c1c[nH]c2c1cccc2 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 1
- UJOBWOGCFQCDNV-UHFFFAOYSA-N c1ccc2[nH]c3ccccc3c2c1 Chemical compound c1ccc2[nH]c3ccccc3c2c1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 1
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- Measurement Of Radiation (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、放射線線量の検出・測定に有用な感放射線組成物、およびこれを用いた線量計に存する。
【０００２】
【従来の技術】
医療器具の放射線滅菌あるいは放射線廃棄物の管理などにおいて、放射線線量が簡便に評価できる線量計が使われている。従来の線量計は、メチルオレンジなどｐＨインジケーターを用い、放射線反応に伴う酸発生による変色など（山上他、Ｃｈｅｍ．Ｅｘｐｒｅｓｓ ５，８０９（１９９０））を用いている。
【０００３】
【発明が解決しようとする課題】
しかしながらこのようなｐＨインジケーターを用いた線量計は、大線量（５０００グレイ以上）でのみ使用可能で、線量の低い領域では変色せず使用できない。また、一回のみ使用可能で、再使用はできない。
一方、フォトクロミック分子は、光の作用により色の異なる２つの異性体を可逆的に生成する分子を言い、調光レンズ、光メモリ、光スイッチなどへの応用をめざし、研究開発がすすめられている。フォトクロミック分子には、光のみならず放射線照射によっても可逆に変色するものがある。これらは、本質的に線量計へ応用可能であるが、これまでそのような使用例はない。それは、従来のフォトクロミック分子では、いずれにおいても放射線生成する着色体（逆フォトクロミック反応系では無色体）が熱的に不安定で、暗黒中においても自然と無色体（逆フォトクロミック反応系では着色体）にもどるため、線量測定のための着色体濃度を正確に計測することができなかったためである。
【０００４】
このような課題を解決するために、既に発明者らは、ポリスチレンなどの芳香環を側鎖あるいは主鎖に含む高分子に熱不可逆性フォトクロミック化合物を分散または溶解して使用することを提案している。（特開平１１−２５８３４８号公報参照。）
【０００５】
【課題を解決するための手段】
本発明者らは更なる鋭意検討の結果、系内に、ナフタレン環などの縮合多環芳香族構造を有する化合物と、熱不可逆性フォトクロミック化合物とを含む感放射線組成物は、放射線感受性が非常に高く、これを用いることにより、前述のような熱退色を生じず、かつ放射線量に応じてリニアに吸収強度が変化し、また１０００グレイ以下、更には５００グレイ以下の放射線量をも測定可能なフォトクロミック線量計を提供できることを見出し、本発明に到達した。
【０００６】
すなわち本発明は、少なくとも、熱不可逆性フォトクロミック化合物と、下記部分構造（Ｉ）を繰り返し単位として有するビニル重合体を含有する感放射線組成物、およびこれを用いた線量計に有する。
【０００７】
【発明の実施の形態】
以下、本発明をより詳細に説明する。
本発明に用いられる熱不可逆性フォトクロミック化合物としては、作業環境において実質的な熱不可逆性を有するものであればよいが、通常は４０℃以下、好ましくは８０℃以下で実質的な退色を生じない化合物が好ましい。また放射線の作用により、色の異なる２つの異性体を可逆的に生成する化合物が好ましい。
【０００８】
このようなフォトクロミック化合物としては、例えばフルギド系化合物やジアリールエテン系化合物が挙げられ、例えば特開平６−２６３７５３号公報、特開平８−２４５５７９号公報、特開平９−２４１２５４号公報、特開平９−２４１６２５号公報等に記載されたものより適宜選択することができる。
より好ましくは該熱不可逆性フォトクロミック化合物がジアリールエテン系化合物であり、さらに好ましくは該熱不可逆性フォトクロミック化合物が、結晶フォトクロミズムを示すものである。
【０００９】
本発明の感放射線組成物は、系内に縮合多環芳香族構造を有する高分子化合物、具体的には繰り返し単位として下記部分構造を有するビニル重合体、を含むことを特徴とする。
を有していてもよい縮合多環芳香族基を表す。）
Ａｒで表される縮合多環芳香族基としては、例えば５員環および／または６員環が２個以上縮合してなる環構造が挙げられ、具体的には例えば下記の構造が挙げられる。
【００１０】
【化３】
これらは置換基を有していてもよく、該置換基としては、例えばエチル基、メチル基、ブチル基、オクチル基などの、炭素数１〜１０の直鎖または分岐のアルキル基；フェニル基、ビフェニル基、または前述した縮合多環芳香族構造に対応する一価の基などのアリール基；水酸基；フッ素原子、塩素原子などのハロゲン原子等が挙げられる。
【００１２】
本発明における縮合多環芳香族構造には、一重項励起状態の寿命が長く、本発明で用いる熱不可逆性フォトクロミック化合物よりも高いエネルギーを有することが要求される。使用する熱不可逆性フォトクロミック化合物の種類によって、縮合する芳香族環の数の好ましい範囲は異なるが、縮合する環の数が多くなると励起状態のエネルギーが低くなる傾向があるため、概して５員環および／または６員環が２〜４個縮合してなる縮合多環芳香族構造が好ましく、中でもナフタレン環構造が特に好ましい。
【００１６】
ビニル重合体としては、好ましくは下記部分構造（Ｉ）および（II）を繰り返し単位として有する重合体が挙げられる。
【００１７】
【化５】
上記構造中、Ｒ1およびＲ2は各々独立に水素原子または炭素数１〜３のアルキル基を表す。
ベンゼン環Ａは置換基を有していてもよく、該置換基としてはエチル基、メチル基、ブチル基、オクチル基などの、炭素数１〜１０の直鎖または分岐のアルキル基；フェニル基、ビフェニル基、または前述した縮合多環芳香族構造に対応する一価の基などのアリール基；水酸基；フッ素原子、塩素原子などのハロゲン原子等が挙げられる。ベンゼン環Ａとしては、無置換のフェニル基が特に好ましい。
【００１９】
Ａｒ基は、前述した縮合多環芳香族構造に対応する一価の縮合多環芳香族基を表し、好ましくは５員環および／または６員環が２個以上縮合してなる縮合多環芳香族基を表す。Ａｒ基が有していてもよい置換基、およびＡｒ基として好ましいものは、前述した縮合多環芳香族構造と同様である。
該ビニル重合体において、部分構造（Ｉ）は０〜９５mol％、構造（II）が５〜１００mol％が好ましい。なお、該ビニル重合体の性能を損なわない範囲で、その他のエチレン性不飽和結合を有するモノマー由来の部分構造を有していてもよい。
【００２０】
ビニル重合体として特に好ましくは、部分構造（Ｉ）として２−ビニルナフタレン由来の構造を有する２−ビニルナフタレン共重合体であり、最も好ましくは部分構造（Ｉ）として２−ビニルナフタレン由来の構造、および部分構造（II）としてスチレン由来の構造を有するビニル重合体である。
【００２４】
ビニル重合体は、いわゆるオリゴマー程度の分子量であってもかまわないが、後述する
ように本発明の感放射線組成物を用いてフィルムを形成する場合には、ある程度高分子量である方が好ましい。よって、分子量としては、特に制限はないが、ＧＰＣで測定したポリスチレン換算の重量平均分子量で通常３，０００〜１，０００，０００程度である。
【００２６】
本発明の感放射線組成物は、少なくとも熱不可逆性フォトクロミック化合物と、縮合多環芳香族構造を有する化合物を含有しており、通常は、これらが適当な有機溶媒に溶解した溶液または分散した分散液であるか、必要に応じて適当な有機溶媒やバインダー樹脂を含んだ樹脂組成物である。これらの組成物を用いることにより、非常に精度よく放射線線量の検出・測定が可能な線量計を得ることができる。これらの線量計を、放射線暴露すると、線量に応じて色調が変化する。この色変化を吸収スペクトルあるいは透過率変化により計測すれば線量を見積もることができる。
【００２７】
本発明の感放射線組成物に放射線が照射されると、まず放射線エネルギーによって高い励起状態へ励起された媒体励起子が媒体間を移動し、系中の縮合多環芳香族構造にトラップされ、そこからフォトクロミック化合物へ励起エネルギーが移動し、発色する。縮合多環芳香族構造が存在しない系中ではすぐに基底状態に失活し、失われてしまうエネルギーが、縮合多環芳香族構造に安定にトラップされ、メディエーターとして有効に利用されるのである。
【００２８】
本発明の感放射線組成物が溶液または分散液の場合、具体的には、上述のフォトクロミック化合物および縮合多環芳香族構造を有する化合物を、ベンゼンあるいはトルエンなどの芳香族溶媒に溶解（濃度範囲としては、１０-5〜１０ｍｏｌ／ｌ）し、その溶液を線量計とする。放射線照射後、可視域での吸収強度を測定することにより、照射線量が見積もられる。
【００２９】
本発明の感放射線組成物が樹脂組成物である場合、必要に応じてバインダー樹脂や有機溶剤を加え、基材となる樹脂製フィルム、シートまたはガラス基板などに塗布・乾燥するか、または該樹脂組成物から公知の方法にてフィルムを形成することにより、線量計が得られる。これらフィルム状の線量計を放射線暴露し、その後可視域の吸収スペクトル変化測定により、線量計測が行われる。
【００３０】
本発明の感放射線組成物は、前述のように部分構造（Ｉ）で表される繰り返し単位を有するビニル重合体を含有しているので、このビニル重合体自身を主成分とするフィルム状の線量計を形成することは可能であるが、本発明の感放射線組成物の性質を損なわない範囲で、必要に応じてバインダー樹脂を含有していてもよい。
【００３１】
このようなバインダー樹脂としては、ポリビニルアルコール、ポリビニルピロリドン、ニトロセルロース、酢酸セルロース、ケトン系樹脂、アクリル系樹脂、ポリスチレン系樹脂、ウレタン系樹脂、ポリビニルブチラール、ポリカーボネート、ポリオレフィン等、バインダー樹脂として一般に使用される樹脂を使用することができる。
【００３２】
さらに本発明の感放射線組成物は、その性能を損なわない範囲で任意の添加剤を含有していてもよい。なお、本発明の感放射線組成物は、前述の部分構造（Ｉ）で表される繰り返し単位を有するビニル重合体に加えて、前述したような縮合多環構造を有する化合物を含有していてもよい。
【００３３】
本発明の感放射線組成物における前述の部分構造（Ｉ）を有するビニル重合体と、熱不可逆性フォトクロミック化合物の含有量の重量比は１〜４０：９９〜５である。
【００３４】
【実施例】
以下、本発明を実施例により更に具体的に説明するが、本発明はこれら実施例に限定されるものではない。
（実施例１〜４）
下記一般式(ｉ)に示す繰り返し単位を有するポリマー（共重合比n=0.05、ｍ＋ｎ＝１）を０．９０ｇ、
【００３５】
【化８】
および下記一般式（ii）で示されるジアリールエテン０．１０ｇ
【００３７】
【化９】
をトルエンに溶解しキャストすることで、厚さ０．２ｍｍの無色透明プラスチックフィルムを作成した。これに放射線（60Ｃｏのγ線）照射を行ったところ、１０００グレイ照射によりフィルムは青く着色し、600nmにおける吸光度が照射前と比較して0.070増加した。
同様に、共重合比をｎ＝0.1、0.2、0.5に変えて各々厚さ０．２ｍｍのプラスチックフィルムを作成した。前述と同様に放射線照射を行ったところ、表−１に示すように吸光度変化がみとめられた。
【００３９】
なお、吸光度変化後のフィルムを室温にて１日放置したが、吸収変化は無かった。さらにこれらのフィルムに対し可視光を照射したところ、発色が消えることが確認できた。
【００４０】
【表１】
表−１に示した吸光度変化の値から、実施例１〜４にて得られたフィルム状線量計を使用することにより、５００グレイ以下の放射線をも充分検出可能であることが明らかである。
【００４４】
（比較例）
ポリスチレン（ＧＰＣ換算による重量平均分子量：１０万）0.8gと上記一般式（ii）0.2 ｇをトルエンに溶解させキャストすることで、厚さ０．２ｍｍの無色透明プラスチックフィルムを形成した。
得られたフィルムに対し、実施例１と同様に放射線（60Ｃｏ繃線）照射を行ったところ、１０００グレイ照射によりフィルムは青く着色し、600nm における吸光度が照射前と比較して０．０６５増加した。
【００４５】
以上の結果より、ナフタレン基を有するポリマーやナフタレンを添加することによって、フォトクロミック化合物の放射線感受性がよくなることがわかった。
【００４６】
【発明の効果】
本発明の感放射線組成物は、例えば放射線増感紙、放射線量計、及び放射線画像変換パネル等に好適に用いられる。また、該組成物を用いたフォトクロミック線量計は、高感度で放射線計測ができる上に、再使用可能である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radiation-sensitive composition useful for detection and measurement of radiation dose, and a dosimeter using the same.
[0002]
[Prior art]
In radiation sterilization of medical equipment or management of radioactive waste, dosimeters that can easily evaluate the radiation dose are used. A conventional dosimeter uses a pH indicator such as methyl orange and uses discoloration caused by acid generation accompanying radiation reaction (Yamagami et al., Chem. Express 5,809 (1990)).
[0003]
[Problems to be solved by the invention]
However, such a dosimeter using a pH indicator can be used only at a large dose (5000 gray or more), and cannot be used without being discolored in a low dose region. It can be used only once and cannot be reused.
On the other hand, a photochromic molecule is a molecule that reversibly generates two isomers of different colors by the action of light, and research and development are being carried out with the aim of application to a light control lens, an optical memory, an optical switch, and the like. Some photochromic molecules reversibly discolor not only by light but also by irradiation. These are inherently applicable to dosimeters, but there has been no such use so far. In any conventional photochromic molecule, the colored body that produces radiation (colorless body in the reverse photochromic reaction system) is thermally unstable, and it is naturally colorless even in the dark (colored body in the reverse photochromic reaction system). This is because the color body concentration for dose measurement could not be accurately measured.
[0004]
In order to solve such problems, the inventors have already proposed that a thermally irreversible photochromic compound be used by dispersing or dissolving it in a polymer containing an aromatic ring such as polystyrene in the side chain or main chain. Yes. (See JP-A-11-258348.)
[0005]
[Means for Solving the Problems]
As a result of further intensive studies, the present inventors have found that a radiation-sensitive composition containing a compound having a condensed polycyclic aromatic structure such as a naphthalene ring and a thermally irreversible photochromic compound in the system has very high radiation sensitivity. By using this, the thermal fading as described above does not occur, the absorption intensity changes linearly according to the radiation dose, and the radiation dose of 1000 gray or less, and even 500 gray or less can be measured. The present inventors have found that a photochromic dosimeter can be provided and have reached the present invention.
[0006]
That is, the present invention has at least a heat-irreversible photochromic compound, a radiation-sensitive composition containing a vinyl polymer having the following partial structure (I) as a repeating unit , and a dosimeter using the same.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
The heat irreversible photochromic compound used in the present invention is not particularly limited as long as it has substantial heat irreversibility in the working environment. Compounds are preferred. Moreover, the compound which produces | generates two isomers from which a color differs reversibly by the effect | action of a radiation is preferable.
[0008]
Examples of such photochromic compounds include fulgide compounds and diarylethene compounds. For example, JP-A-6-263653, JP-A-8-245579, JP-A-9-241254, JP-A-9-241625. It can be selected as appropriate from those described in Japanese Patent Publications.
More preferably, the thermally irreversible photochromic compound is a diarylethene compound, and more preferably, the thermally irreversible photochromic compound exhibits crystal photochromism.
[0009]
The radiation-sensitive composition of the present invention is characterized in that the system contains a polymer compound having a condensed polycyclic aromatic structure, specifically, a vinyl polymer having the following partial structure as a repeating unit .
Represents a condensed polycyclic aromatic group which may have )
Examples of the condensed polycyclic aromatic group represented by Ar, for example, an 5-membered ring and / or 6-membered ring is condensed two or more ring structures, and specific examples thereof include structural example below.
[0010]
[Chemical 3]
These may have a substituent. Examples of the substituent include a linear or branched alkyl group having 1 to 10 carbon atoms such as an ethyl group, a methyl group, a butyl group, and an octyl group; a phenyl group, An aryl group such as a biphenyl group or a monovalent group corresponding to the above-mentioned condensed polycyclic aromatic structure; a hydroxyl group; a halogen atom such as a fluorine atom or a chlorine atom;
[0012]
The condensed polycyclic aromatic structure in the present invention is required to have a long lifetime in a singlet excited state and to have higher energy than the thermally irreversible photochromic compound used in the present invention. Depending on the type of thermally irreversible photochromic compound used, the preferred range of the number of aromatic rings to be condensed varies, but as the number of condensed rings increases, the energy of the excited state tends to decrease, A condensed polycyclic aromatic structure in which 2 to 4 6-membered rings are condensed is preferable, and a naphthalene ring structure is particularly preferable.
[0016]
As the vinyl polymer, preferably a polymer and the like having as a repeating unit of the following partial structures (I) and (II).
[0017]
[Chemical formula 5]
In the above structure, R 1 and R 2 each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
The benzene ring A may have a substituent, and as the substituent, a linear or branched alkyl group having 1 to 10 carbon atoms such as an ethyl group, a methyl group, a butyl group, and an octyl group; a phenyl group, An aryl group such as a biphenyl group or a monovalent group corresponding to the above-mentioned condensed polycyclic aromatic structure; a hydroxyl group; a halogen atom such as a fluorine atom or a chlorine atom; As the benzene ring A, an unsubstituted phenyl group is particularly preferable.
[0019]
Ar group represents a monovalent condensed polycyclic aromatic group corresponding to the above-mentioned condensed polycyclic aromatic structure, and preferably a condensed polycyclic aromatic formed by condensing two or more 5-membered rings and / or 6-membered rings. Represents a group. The substituent that the Ar group may have and the preferred Ar group are the same as the above-mentioned condensed polycyclic aromatic structure.
In the vinyl polymer, the partial structure (I) is preferably 0 to 95 mol% and the structure (II) is preferably 5 to 100 mol%. In addition, you may have the partial structure derived from the monomer which has another ethylenically unsaturated bond in the range which does not impair the performance of this vinyl polymer.
[0020]
The vinyl polymer is particularly preferably a 2-vinylnaphthalene copolymer having a structure derived from 2-vinylnaphthalene as the partial structure (I), and most preferably a structure derived from 2-vinylnaphthalene as the partial structure (I). and Ru vinyl polymer der having a structure derived from styrene as a partial structure (II).
[0024]
The vinyl polymer may have a molecular weight as high as a so-called oligomer. However, when the film is formed using the radiation-sensitive composition of the present invention as described later, it is preferable that the vinyl polymer has a certain high molecular weight. Therefore, the molecular weight is not particularly limited, Ru der usually about 3,000 to 1,000,000 in weight-average molecular weight in terms of polystyrene measured by GPC.
[0026]
The radiation-sensitive composition of the present invention contains at least a thermally irreversible photochromic compound and a compound having a condensed polycyclic aromatic structure, and these solutions are usually dissolved or dispersed in an appropriate organic solvent. Or a resin composition containing an appropriate organic solvent or binder resin as required. By using these compositions, it is possible to obtain a dosimeter capable of detecting and measuring a radiation dose with very high accuracy. When these dosimeters are exposed to radiation, the color tone changes according to the dose. The dose can be estimated if this color change is measured by the absorption spectrum or transmittance change.
[0027]
When radiation is irradiated to the radiation-sensitive composition of the present invention, first, medium excitons excited to a high excited state by radiation energy move between the media, and are trapped in the condensed polycyclic aromatic structure in the system. The excitation energy is transferred from the photochromic compound to the photochromic compound, resulting in color development. In a system in which a condensed polycyclic aromatic structure does not exist, the energy that is immediately deactivated and lost is stably trapped in the condensed polycyclic aromatic structure and effectively used as a mediator.
[0028]
When the radiation-sensitive composition of the present invention is a solution or dispersion, specifically, the above-described photochromic compound and a compound having a condensed polycyclic aromatic structure are dissolved in an aromatic solvent such as benzene or toluene (as a concentration range). 10 −5 to 10 mol / l), and the solution is used as a dosimeter. After the irradiation, the irradiation dose is estimated by measuring the absorption intensity in the visible range.
[0029]
When the radiation-sensitive composition of the present invention is a resin composition, a binder resin or an organic solvent is added as necessary, and the resin film, sheet, or glass substrate as a substrate is applied and dried, or the resin A dosimeter is obtained by forming a film from the composition by a known method. These film-like dosimeters are exposed to radiation, and then dose measurement is performed by measuring changes in absorption spectrum in the visible region.
[0030]
Since the radiation-sensitive composition of the present invention contains a vinyl polymer having a repeating unit represented by the partial structure (I) as described above, a film-like dose mainly composed of the vinyl polymer itself. Although it is possible to form a meter, it may contain a binder resin as required, as long as the properties of the radiation-sensitive composition of the present invention are not impaired.
[0031]
As such binder resins, polyvinyl alcohol, polyvinyl pyrrolidone, nitrocellulose, cellulose acetate, ketone resins, acrylic resins, polystyrene resins, urethane resins, polyvinyl butyral, polycarbonate, polyolefins, etc. are generally used as binder resins. Can be used.
[0032]
Furthermore, the radiation-sensitive composition of the present invention may contain any additive as long as the performance is not impaired. The radiation-sensitive composition of the present invention may contain a compound having a condensed polycyclic structure as described above in addition to the vinyl polymer having a repeating unit represented by the partial structure (I). Good.
[0033]
The weight ratio of the content of the vinyl polymer having the partial structure (I) and the thermally irreversible photochromic compound in the radiation-sensitive composition of the present invention is 1 to 40:99 to 5.
[0034]
【Example】
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
(Examples 1-4)
0.90 g of a polymer having a repeating unit represented by the following general formula (i) (copolymerization ratio n = 0.05, m + n = 1),
[0035]
[Chemical 8]
And 0.10 g of diarylethene represented by the following general formula (ii)
[0037]
[Chemical 9]
Was dissolved in toluene and cast to prepare a colorless transparent plastic film having a thickness of 0.2 mm. Was carried out this radiation (60 gamma rays Co) irradiation, the film is colored blue by 1000 Gray irradiation, the absorbance was 0.070 increased compared with before the irradiation of 600 nm.
Similarly, the copolymerization ratio was changed to n = 0.1, 0.2, 0.5, and plastic films each having a thickness of 0.2 mm were prepared. When irradiation was performed in the same manner as described above, changes in absorbance were observed as shown in Table-1.
[0039]
The film after the change in absorbance was left at room temperature for 1 day, but there was no change in absorption. Further, when these films were irradiated with visible light, it was confirmed that the color development disappeared.
[0040]
[Table 1]
From the absorbance change values shown in Table 1, it is apparent that radiation of 500 gray or less can be sufficiently detected by using the film dosimeters obtained in Examples 1 to 4 .
[0044]
(Comparative example)
Po polystyrene (weight average molecular weight by GPC in terms: 100,000) 0.8 g and the general formula (ii) 0.2 g by casting dissolved in toluene to form a colorless transparent plastic film having a thickness of 0.2 mm.
The obtained film, Example 1 and was subjected to the same radiation (60 Co繃線) irradiation, by 1 000 Gray irradiation films colored blue, compared absorbance and before irradiation at 600 nm 0.065 Increased.
[0045]
From the above results, it was found that the radiation sensitivity of the photochromic compound is improved by adding a polymer having naphthalene group or naphthalene.
[0046]
【The invention's effect】
The radiation-sensitive composition of the present invention is suitably used for, for example, a radiation intensifying screen, a radiation dosimeter, and a radiation image conversion panel. In addition, a photochromic dosimeter using the composition can measure radiation with high sensitivity and can be reused.
Claims (8)
していてもよい縮合多環芳香族基を表す。） A radiation-sensitive composition containing at least a heat irreversible photochromic compound and a vinyl polymer having the following partial structure (I) as a repeating unit .
Represents a condensed polycyclic aromatic group which may be substituted. )
放射線組成物。Radiation composition.
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| WO2013005797A1 (en) * | 2011-07-07 | 2013-01-10 | 日産化学工業株式会社 | Resist underlayer film-forming composition which contains alicyclic skeleton-containing carbazole resin |
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