Study on the Radiation Induced Reactions in Aqueous Solutions

水溶液中辐射诱发反应的研究

• 批准号: 07458098
• 负责人: KATSUMURA Yosuke
• 金额: $ 3.46万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458098/
• 关键词: radiation chemistry; aqueous solutions; pulse radiolysis; spur reactions; direct effects; indirect effects; ion beams; 放射線科学; LET効果

At the beginning, we picked up the following four targets. The first one is the clarification of radiation induced reactions in concentrated aqueous solutions. This is closely related to theradiation effects in nuclear technology, such as reprocessing of the spent fuels. From the measurements in different kinds of acid solutions, it was found that direct action of radiation becomes important. This can be used for the radical formation corresponding to anions. In fact, we found CIO_3 radical for the first time in concentrated CIO_3 aqueous solution. The second is the construction and application of ion beam pulse radiolysis system at HIMAC,National Institute of Radiological Sciences, which is the only one ion beam pulse radiolysis facility in the world. This provides us to study the LET effect induced with ion beams to obtain the basic knowledge for radiation science such as radiation biology and radiation therapy. From the measurement of the concentration dependence of scavenging yields, the spatial distribution of the water decomposition products have been discussed. The third one is the development of computer calculation code for radiation induced reactions in aqueous solutions based on spur kinetic diffusion model. The calculation code has been prepared and has been employed for the analysis. The last subject is the development of highly time resolved pulse radiolysis equipment with pico, even sub-pico second resolution for the study on the primary processes in radiation induced reactions but the goal is still far. After three years efforts, the first three subjects have been carried out with satisfaction and the details of the results has been summarized in a report.

一开始，我们选择了以下四个目标。第一个是澄清在浓水溶液中的辐射诱导反应。这与核技术中的辐射效应密切相关，例如乏燃料的后处理。从在不同种类的酸溶液中的测量中发现，辐射的直接作用变得重要。这可以用于对应于阴离子的自由基形成。实际上，我们首次在浓ClO_3水溶液中发现了ClO_3自由基。第二部分介绍了国际上唯一的离子束脉冲辐解装置--国立放射科学研究所HIMAC的离子束脉冲辐解装置的建设和应用。这为我们研究离子束诱导的LET效应提供了基础知识，为辐射生物学和放射治疗等辐射科学提供了基础知识。通过测定清除率的浓度依赖性，讨论了水分解产物的空间分布。第三部分是基于Spur动力学扩散模型的水溶液辐射诱导反应计算机计算程序的开发。编制了计算程序并用于分析。最后一个课题是研制高时间分辨的脉冲辐解装置，具有皮科甚至亚皮秒的分辨率，用于辐射诱导反应中的初级过程的研究，但距离目标还很远。经过三年的努力，前三个主题已经得到了令人满意的实施，并在一份报告中总结了结果的细节。

项目成果

Y.Katsumura et.al.: "Radiation Effects of Nitrogen Oxides in Aqueous Solutions" RADIOISOTOPES. 46. 261-262 (1997)

Y.Katsumura 等人：“水溶液中氮氧化物的辐射效应”放射性同位素。

Y.Katsumura et al.: "Radiolysis of Concentrated Perchloric Acid Solutions Studied by Pulse and γ-Radiolyis" J.Chem.Soc.Farada Trans.(印刷中).

Y. Katsumura 等人：“脉冲和 γ-Radiolyis 研究的浓高氯酸溶液的放射分解”J. Chem Soc。

Y.Katsumura et al.: "Radiolysis of Concentrated Perchloric Acid Solutions Studied by Pulse and γ-Radiolysis" J.Chem.Soc.Faraday Trans.,. 92. 2245-2250 (1996)

Y.Katsumura 等人：“通过脉冲和 γ-放射分解研究的浓高氯酸溶液的放射分解”J.Chem.Soc.Faraday Trans., 92. 2245-2250 (1996)

Y.Katsumura et al.: "Modeling of Primary Chemical Processes of Water Radiolysis and Simulationb by Spur Diffusion Model" Radiat.Phys.Chem.48. 487-495 (1996)

Y.Katsumura 等人：“通过杂散扩散模型对水辐射分解的主要化学过程进行建模和模拟”Radiat.Phys.Chem.48。

Y.Katsumura et. al.: "A Possible Mechanism of Wall-Rock Hematization in Uranium Deposits Radiation-Induced Oxidation of Ferrous Ion" Geochmical Journal. 31. 183-188 (1997)

Y.Katsumura 等。