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※ 半角英数字
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Radiation chemistry of liquid water with heavy ions; Steady-state and pulse radiolysis studies

液体の水の重粒子線放射線化学; 定常照射及びパルスラジオリシス研究

山下 真一; 田口 光正; Baldacchino, G.*; 勝村 庸介

Yamashita, Shinichi; Taguchi, Mitsumasa; Baldacchino, G.*; Katsumura, Yosuke

重イオンの照射効果は低LET放射線とは大きく異なる。このような特異性は放射線治療や表面加工,分析技術などに利用されているものの、なぜこのような特異性が生じるのか、その詳細なメカニズムには依然不明な点も残っている。本章では、原子イオンビームによる水の放射線分解について実験的にどのようなことが近年明らかになってきたか、特にこの5年間の進展を中心に取り上げる。また、定常照射とパルス照射とでは利点や制限も異なるため、別々にまとめてある。これまで報告されている水分解生成物の収量からトラック構造やトラック内ダイナミクスについても議論する。

Irradiation effects induced by heavy ions are much different from those by low-LET radiations. Such distinctiveness has been applied to cancer therapy, surface processing, analytical techniques, and so on. However, detailed mechanism through which such distinctiveness appears has not been clarified yet. In this chapter, what have experimentally been found recently, especially within these five years, in water radiolysis with positively-charged atomic heavy ions are shown. Steady-state radiolysis studies and pulse radiolysis studies are separately summarized because these two approaches inherently involve own advantages and limitations. Gathering reported products yields and kinetics, track structures and intra-track dynamics are discussed. One of the most characteristic features of recent studies is that track-segment or -differential yields were intensively measured compared to earlier studies.

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