Development of a method of neutron spectrum measurement for monoenergetic neutrons generated from an accelerator for the use of radiation biology

开发用于辐射生物学的加速器产生的单能中子的中子谱测量方法

基本信息

批准号：
07558079
负责人：
HOSHI Masaharu
金额：
$ 0.45万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558079/
关键词：
neutron generator energy spectrum biological effect accelerator TOF neutron

项目摘要

The final purpose of the study radition effects for biological materials is, in short, to protect general and professional people from the exposure of radiation, for those of atomic bomb survivors, radiation workers in nuclear opwer plant and medical examinee and poerator. For this kind of study it is necessary to know precisely the radiobiological effects for ourselves and biological materials.Recently our Research Institute for Raciation Biology Hiroshima University developed monoenergetic neutron generator, which generate neutrons less than 1.2 MeV,and began to study the effect and the mechanism of the effect of its neutrons.In the study of neutron effects, we must know the characteristics of its neutrons. One of the most important one is the energy spectrum and for this it is necessary to verify according to the measurements. We tested some method such as a He3-counter, however, thev were not enough. In this study we apply the most accurate method of "time of flight (TOF)". In this … More study we measure flight time of neutrons and from this their energies are calculated.The apparatus was mede by Nissin Electric Co., Ltd. To bend the beam we used 5kV pulsed electric power source and chopped the beam. The chopped beam hit a lithium target. From the lithium target pulsed neutrons were emitted according to the (p, n) reaction. The neutrons were detected by a scintillation detector. From the pulse signals of the chopper and scintillator we can measure flight times of the neutrons from the time differences of both signals. The energy of the neutrons were determined by the estimated velocities of the neutrons.The apparatus was installed in the system of the neutron generator and analyzing power of the neutron energy was obtained as 20 ns, which correspond to the 8% of the resolution for 500 keV neutrons. WE could almost accomplished out initial plan as the results of this study. We will make more effort to obtain more accuracy. By this study plan we became to determine accurate neutron energy spectra. The analysis of the mechanism of the radiation effects for the biological substances will be able to make much more deeply than before. Less

简而言之，研究辐射对生物材料的影响的最终目的是保护普通和专业人士免受辐射照射，例如原子弹幸存者、核电站辐射工作人员以及医学检查者和操作者等。最近，我们广岛大学种族生物学研究所开发出单能中子发生器，产生小于1.2 MeV的中子，并开始研究中子的作用及其作用机理。在中子效应的研究中，我们必须了解其中子的特性，其中最重要的一个就是能谱，为此需要根据中子的能谱进行验证。我们测试了一些方法，例如 He3 计数器，但是，在这项研究中，我们应用了最准确的“飞行时间 (TOF)”方法。在这项研究中，我们测量了中子的飞行时间。并由此它们的能量是。该装置由 Nissin Electric Co., Ltd. 计算。为了弯曲光束，我们使用 5kV 脉冲电源并将光束斩波，斩波光束击中锂靶材，从锂靶材发射出脉冲中子。从斩波器和闪烁体的脉冲信号中我们可以测量中子的飞行时间。中子能量的差异由中子的估计速度确定。该装置安装在中子发生器的系统中，得到的中子能量的分析功率为20 ns，对应于8%。根据这项研究的结果，我们几乎可以完成 500 keV 中子的分辨率，我们将更加努力地获得更准确的结果。中子能谱对生物物质的辐射效应机理的分析将比以前更加深入。