| Project/Area Number |
17H01374
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Osaka University |
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Principal Investigator |
Yoshida Yoichi 大阪大学, 産業科学研究所, 教授 (50210729)
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| Co-Investigator(Kenkyū-buntansha) |
菅 晃一 大阪大学, 産業科学研究所, 助教 (60553302)
近藤 孝文 大阪大学, 産業科学研究所, 助教 (50336765)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2019: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2018: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
Fiscal Year 2017: ¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
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| Keywords | 放射線化学 / 量子ビーム / ナノファブリケーション / 電子加速器 / パルスラジオリシス / アト秒 |
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| Outline of Final Research Achievements |
Theoretical study of ultra-short electron beam generation found the third order effect in longitudinal phase-space distribution through electron transport simulation. To realize wide range of electron bunch length measurement, electron bunch measurement systems by a Michelson interferometer with dual band detector for frequency domain measurement and by a photoconductive antenna with pulsed laser for time domain measurement were successfully developed.
Early stage processes just after ionization induced by ionizing radiation were studied in non-polar solvent and halomethanes. In non-polar solvent, it was found that the contribution of high mobility electron like quasi-free electron cannot be ignored in addition to the well-known diffusion controlled reaction. In halomethanes, the dominant reaction intermediate was not the same in ionizing radiation induced reaction with that in photo-ionization.
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| Academic Significance and Societal Importance of the Research Achievements |
超短パルス電子ビーム発生・測定系の構築および超高時間分解パルスラジオリシスを用いて、種々の物質で量子ビーム誘起反応の熱化・緩和過程を解明した。本研究のパルスラジオリシスを用いることにより、量子ビーム誘起反応の熱化・緩和過程の測定が可能となり、EUV（極端紫外線）等の次世代半導体微細加工では、新しいレジストプロセスの開発が可能となる。放射線がん治療において重要な放射線のDNAに与える効果として、DNAの直接イオン化や水和前電子の高速反応の寄与が指摘されており、前駆体であるドライ電子や水和前電子の反応性の解明は、放射線の生物影響の理解に大きく寄与する。
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