JP2022037678A - 透明なガンマ線・x線及び中性子共用遮蔽材 - Google Patents
透明なガンマ線・x線及び中性子共用遮蔽材 Download PDFInfo
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Images
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
この中で、電気的に中性な中性子線及びガンマ線・X線は、電磁相互作用により物質に遮られることが無いため、これから人体などを防護するためには、特にその性質に応じた遮蔽材が必要とされる。
非特許文献1にはコバルト60の照射によるエポキシ樹脂の着色が議論され、着色を定量化することにより1-50kGyの範囲における線量計としての可能性が示唆されており、遮蔽材として用いる場合には、放射線照射下で使用する際のエポキシ樹脂の着色を小さくするための工夫が必要である。
そして前記金属単体及び/または金属化合物としてはBi、Y,Zr,Nb,Mo,Hf,Ta,W及びランタノイドの少なくとも一つの元素を含むことが好ましく、また、ナノ粒子の平均粒径20nm以下であることが好ましい。
<用語の説明>
<原料のエポキシ樹脂>
<硬化剤>
<促進剤>
<金属化合物ナノ粒子>
金属単体および/または金属化合物ナノ粒子がY、Zr、Nb、Mo、Hf、Ta、Wおよびランタノイドの少なくとも一つの元素を含むことが好ましい。
金属化合物ナノ粒子が酸化物、窒化物、炭化物、ホウ化物の少なくとも一つであることが好ましい。
またナノ粒子はエポキシ樹脂と相溶性のある有機溶媒中に分散されていることが望ましい。メチルエチルケトンを分散媒としたジルコニアナノ粒子分散液としては株式会社日本触媒(商品名ジルコスター、粒子径:11nm (https://www.shokubai.co.jp/ja/particle/new/new3.html)、株式会社アイテック(商品名Zirconeo-Ck、粒子径:10nm: https://www.ipros.jp/catalog/detail/351751)などが使用できる。
<その他の添加剤>
<成形体の製造方法>
一般的な脱泡所要時間は1分~120分であり、実用的には7分~60分に調整するのが好ましい。
一般的な硬化所要時間は1時間~168時間であり、実用的には6時間~72時間に調整するのが好ましい。
<材料の遮蔽性能の評価>
<放射線照射による光透過率の変化の評価>
高線量率放射線施設での数年間の使用に相当する100kGyあるいは1MGyといった高線量照射を模擬するには、毎時10kGy程度の高線量率で長時間照射可能な施設を用いて、10時間あるいは100時間の照射による加速試験を行えばよい。
ロータリーエバポレータの500mlガラス製回転容器にジルコスターZP-159A:818g、水素化ビスフェノールA型エポキシ樹脂(三菱ケミカル社製YX8000):218g、メチルヘキサヒドロ無水フタル酸(新日本理化社製リカシッドMH-700):157g、メチルトリブチルホスホニウムジメチルホスフェート(日本化学工業社製PX-4MP):2.2gを秤量し、ロータリーエバポレータによるメチルエチルケトン(MEK)除去操作を5.5時間行い、78.5%のMEKを除去した。12×12×5cmの型枠に注型後、雰囲気温度40℃の恒温槽中に24時間保持した。雰囲気温度80℃の恒温槽中に1時間保持、次いで90℃に昇温し、8時間保持した。さらに110℃で2時間保持後型枠から取り出し、得られた成型体を雰囲気温度150℃の恒温槽中に1.5時間保持後、槽内で自然冷却した。取り出し後、切削加工してジルコニアを46質量%含む10×10×3cmの遮蔽試験用の試験体を得た。また、5×5×1.1cm厚の試験体を作成し、耐放射線性試験に供した。
<比較例1>
<比較例2>
<参考例>
<実施例の遮蔽性能評価>
<実施例の耐放射線性の評価>
Claims (7)
- 金属単体及び/または金属化合物のナノ粒子を混合したエポキシ樹脂組成物を酸無水物で硬化したエポキシ樹脂成形物を特徴とする透明な中性子及びガンマ線・X線の双方に対する共用遮蔽材。
- 前記エポキシ樹脂は脂環骨格を有するエポキシ樹脂であることを特徴とする請求項1記載の共用遮蔽材。
- 請求項2記載の脂環骨格を有するエポキシ樹脂は環状オレフィンをエポキシ化して得られることを特徴とする請求項1または2記載の共用遮蔽材。
- 請求項2に記載の脂環骨格を有するエポキシ樹脂は芳香族炭化水素を水素化して得られるエポキシ樹脂であることを特徴とする請求項2に記載の共用遮蔽材。
- 請求項1記載の金属単体及び/または金属化合物としてはY,Zr,Nb,Mo,Hf、Ta、W及びランタノイドの少なくとも一つの元素である請求項1記載の共用遮蔽材。
- 前記金属単体及び/または金属化合物のナノ粒子の平均粒径は20nm以下であることを特徴とする請求項4記載の共用遮蔽材。
- 前記ガンマ線・X線及び中性子に対して透明な共用遮蔽材は核分裂により生じた中性子及びコバルト60から発生するガンマ線の双方に対して放射線遮蔽に用いられる普通コンクリートと同等以上の遮蔽性能を持ち、波長550nmの光の透過率が30%以上である共用遮蔽材。
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