Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(4): 247-258 (2019)

特集Special Issues

3.2.3 高分子系エッチング型飛跡検出器中に形成されるイオントラックの構造3.2.3 Modified Structure Around Ion Tracks in Polymeric Etched Track Detectors

1神戸大学大学院海事科学研究科Graduate School of Maritime Science, Kobe University ◇ 658–0022 神戸市東灘区深江南町5–1–1 ◇ 5–5–1 Fukaeminami-machi, Higashinada-ku, Kobe 658–0022, Japan

2量子科学技術研究開発機構放射線医学総合研究所計測・線量評価部Radiation Measurement Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology ◇ 263–8555 千葉市稲毛区穴川4–9–1 ◇ 4–9–1 Anagawa, Inage-ku, Chiba 263–8555, Japan

発行日:2019年4月15日Published: April 15, 2019

高分子系エッチング型飛跡検出器中に形成されるイオントラックの構造と形成機構を理解するために分析的研究とシミュレーション研究を展開している。照射後の官能基密度変化を,トラックの単位長さ当たりの損傷数(損傷密度)や,損傷の径方向サイズ(実効的トラックコア半径),放射線化学収率について,1.0から12,000 eV/nmの広い阻止能域で評価している。エッチピットを生む損傷形成に果たす多段階の低エネルギー電子のヒットの役割を明らかにしている。

A modified structure around latent tracks in polymeric etched track detectors has been examined. A series of quantitative analyses on the changes in the density of each functional group composing the polymers has provided the chemical damage parameters of the damage density. These include the number of losses of considered functional groups per unit distance of the track length, effective track core radius, in which the chemical groups are lost, and the radiation chemical yields, G values, for each group. These are evaluated as a function of the stopping power, ranging from 1 to 12,000 eV/nm. The role of multi-hits with low energy electron to form any permanent damage has been studied using Monte-Carlo simulations.

Key words: HIMAC (Heavy Ion Medical Accelerator in Chiba); etched track detector; radiation chemical yield; radial electron fluence around ion track

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