Development of simultaneous helium generation technique during neutron irradiation

中子辐照同时产生氦气技术的发展

基本信息

批准号：
07458110
负责人：
MATSUI Hideki
金额：
$ 4.8万
依托单位：
Tohoku University
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 1996
项目状态：
已结题

项目摘要

Since the helium generation rate in fusion reactor environments is much greater than in fission reactors, in order to investigate irradiation effects in fusion materials some measure to generate helium must be undertaken simultaneously with neutron irradiation. The aim of this project is to develop a simultaneous helium generation technique which is applicable to materials such as ferritic steels where conventional techniques are difficult to apply.The concept of the technique is as follows : fissionable materials, e.g.uranium generate high-energy alpha particles at a certain probability in fission reactions. Specimens placed next to such material piece are injected with helium when they are irradiated in a fission reactor. The projected range of this helium is on the order of several tens micro-meters in typical engineering materials e.g.steels. Uniform helium injection may be obtained if the specimens are sandwiched with fissionable materials from both sides provided that the thickness of the specimens are less than several tens micro-meters.Although the principle of this method is rather simple. It has never been tested before until the present successful project. It is also very significant to note that this method provides a technique of simultaneous helium generation in engineering materials such as ferritic steels, where suitable simultaneous helium generation technique did not exist. It is very important that this technique be applied to ferritic steels using a high flux fission reactor to study the helium effects in these materials and bring to an end to the long controversy on the helium embrittlement of ferritic steels.

由于融合反应堆环境中的氦产生速率远大于裂变反应器中的大得多，因此为了研究融合材料中的辐射效应，必须同时使用中子照射同时进行氦气。该项目的目的是开发一种适用于难以应用的材料的同时氦产生技术，该技术适用于诸如铁质钢等材料。该技术的概念如下：可裂变的材料，例如，幼体产生高能量的alpha颗粒裂变反应的一定概率。当在裂变反应器中辐照氦气时，放置在此物质片段旁边的样品会注入氦气。该氦气的预计范围是典型工程材料（例如稳定）中几个数十个微米的顺序。如果标本夹在两侧的裂变材料中，只要样品的厚度小于几个微米。直到当前的成功项目之前，它从未经过测试。同样非常重要的是，这种方法提供了一种在工程材料（例如铁素体钢）中同时产生的技术，那里不存在合适的同时氦产生技术。非常重要的是，使用高通量裂变反应器将该技术应用于铁素体钢，以研究这些材料中的氦气作用，并终止有关铁素体钢的氦含量的长期争议。