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Establishment of Ultra-Low Intensity High-Energy Electron Beams for Irradiation and Their Applications

超低强度高能电子束辐照的建立及其应用

基本信息

批准号：
15560729
负责人：
OKUDA Shuichi
金额：
$ 2.3万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The present work has been performed by using an 18 MeV electron linear accelerator at Research Institute for Advanced Science and Technology in Osaka Prefecture University. The energies of the electron beam used in the experiments are about 10 MeV, which does not cause serious activation of the irradiated samples. In order to establish ultra-low intensity beams for irradiation, new methods for measuring the electron charge of the beam and for transporting the beams have been developed. The lowest charge of the beam finally achieved is 3 fC/pulse, which can be made lower by small adjustment of the accelerator components. Irradiation systems for focused beams and widely expanded beams have been constructed. In the latter case the absorbed dose in the irradiated sample is loss than 100 μSv. This is the first establishment of the system with such low-intensity beams.The thermoluminescence dosimeter used for monitoring personal absorption doses has been irradiated with the electron beam for investigating the characteristics of the dosimeter. The results have been compared with those obtained by gamma-ray irradiation. Two-dimensional absorbed dose distribution has been obtained by using the imaging plate as high-sensitivity dosimeter. Basic research on radiography with high-energy pulsed electron beams has been made by using a sample plate in which model defects have been installed. The experimental results have indicated that these dosimeters can be used for measuring the dose and the dose distribution of the ultra-low intensity electron beams.The electron beams have been also applied to investigating biological effects. It has to be continued for the further investigation.The new technology developed in the present work is expected to be applied to the researches in a various fields.

本研究是在大阪府立大学先进科学技术研究所的18 MeV电子直线加速器上完成的。实验中使用的电子束能量约为10兆电子伏，不会引起辐照样品的严重活化。为了建立用于辐照的超低强度光束，研究了测量光束电荷和传输光束的新方法。光束最终达到的最低电荷为3 fC/脉冲，可以通过对加速器组件进行小的调整来降低。聚焦光束和宽扩展光束的辐照系统已经建立。后一种情况下，辐照样品的吸收剂量损失小于100 μSv。这是第一次用这种低强度光束建立系统。用电子束照射用于监测个人吸收剂量的热释光剂量计，研究了该剂量计的特性。结果与伽玛射线辐照的结果进行了比较。利用成像板作为高灵敏度剂量计，获得了二维吸收剂量分布。利用安装了模型缺陷的样品板，对高能脉冲电子束射线照相进行了基础研究。实验结果表明，这些剂量计可用于测量超低强度电子束的剂量和剂量分布。电子束也被应用于研究生物效应。这需要继续进行进一步的调查。本工作所开发的新技术有望应用于各个领域的研究。