Maeyama Takuya, Fukunishi Nobuhisa, Ishikawa Kenichi L, Fukasaku Kazuaki, Fukuda Shigekazu
Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
J Radiat Res. 2016 Jun;57(3):318-24. doi: 10.1093/jrr/rrw025. Epub 2016 Mar 10.
The radiological properties of nanocomposite Fricke gel (NC-FG) dosimeters prepared with different concentrations of nano-clay, perchloric acid and ferrous ions in deaerated conditions were investigated under carbon and argon ion beam irradiation covering a linear-energy-transfer (LET) range of 10 to 3000 eV/nm. We found that NC-FG exhibits radiological properties distinct from those of conventional Fricke gel. The radiation sensitivity of NC-FG is independent of the LET and is nearly constant even at very high LET (3000 eV/nm) values in the Bragg peak region of the argon ion beam. In addition, whereas conventional Fricke gel dosimeters only operate under acidic conditions, NC-FG dosimeters function under both acidic and neutral conditions. The radiation sensitivity decreases with decreasing nano-clay concentration in NC-FG, which indicates that the nano-clay plays a vital role in the radiation-induced oxidation of Fe(2.)
研究了在脱气条件下，用不同浓度的纳米粘土、高氯酸和亚铁离子制备的纳米复合弗里克凝胶（NC-FG）剂量计在碳离子束和氩离子束辐照下的放射学特性，辐照的线能量转移（LET）范围为10至3000 eV/nm。我们发现NC-FG表现出与传统弗里克凝胶不同的放射学特性。NC-FG的辐射敏感性与LET无关，即使在氩离子束布拉格峰区域的非常高的LET（3000 eV/nm）值下也几乎保持恒定。此外，传统的弗里克凝胶剂量计仅在酸性条件下工作，而NC-FG剂量计在酸性和中性条件下均能工作。NC-FG中纳米粘土浓度降低时，其辐射敏感性也随之降低，这表明纳米粘土在辐射诱导的Fe(2+)氧化中起着至关重要的作用。
