Basic Research on the Minerals Related to High-Level Radioactive Wastes.

高放废物相关矿物基础研究。

基本信息

批准号：
61430015
负责人：
TOKONAMI Masayasu
金额：
$ 12.16万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1989
项目状态：
已结题

项目摘要

High-level radioactive wastes unavoidably remain whenever the used nuclear fuels are reprocessed for the next effective use. These wastes must be kept away from human being and animals in safety for a very long period. Thus, the search of the best way of their disposal is an emergency subject for the use of atomic energy. Most of researches on this problem are performed from technological point of view, however, basic researches of wasted substances are not strongly promoted.In this project, microtextures of minerals which are related to radioactive wastes are mainly investigated because such textures might be observed for the radioactive wastes after a geologically long period. In order to study microtextures, we investigated radioactive minerals or rare-earth minerals which are thought as analogues to show a future's feature for the radioactive wastes. As a result, behaviors of the process of transfer, concentration, substitution of various atoms will be clarified.Main contents which … More we contributed to these subjects are; (1) Developments of Microarea X-ray Diffractometer : Conventional microarea X-ray diffractometer is only available to take powder diffraction pattern of such a small area as 50mum, and it is difficult to get a crystallographic information from smaller area than that. We could get a crystallographic information from 10mum area by single crystal diffraction technique by making a control of a specially designed X-ray gonioneter combined with a developed soft-ware system. By this technique, it will become possible to identify small minerals and to analyze orientation relationship among minerals. (2) Many of rare-earth minerals which are obtained from alkali-carbonatite complexes of Brazil are studied on mineral assemblage, textures, weathering, element concentration etc. by means of X-ray diffraction, scanning microscopy, photon activation analysis and so on. These results will be available to expect the change of rocks around radioactive wastes. (3) International collaboration with overseas scientists in order to discuss geological environments for disposal of radioactive wastes. Tokonami contributed to potentially useful materials for sealing cracks of rocks. Less

每当将用过的核燃料重新处理以进行下一次有效用途时，高级放射性废物就会不可避免地保留。这些废物必须长期安全地远离人类和动物。这是对他们处置的最佳方法的搜索是使用原子能的紧急主题。从技术的角度来看，大多数有关此问题的研究都是从技术角度进行的，但是，浪费物质的基础研究并不是很强大的。在该项目中，主要研究了与放射性废物有关的矿物质的微织物，因为在地理上经过长时间后，可以观察到这种纹理的放射性废物。为了研究微织物，我们研究了放射性矿物质或稀土矿物质，这些矿物被认为是显示放射性废物未来特征的类似物。结果，将阐明转移过程，集中度，替代各种原子的行为。（1）微区X射线衍射仪的发展：传统的微区X射线衍射仪仅可用于服用50MUM等小面积的粉末衍射模式，并且很难从比那更小的区域获得晶体学信息。我们可以通过单晶衍射技术从10MUM区域获取晶体学信息，通过控制特殊设计的X射线Gonioneter与已开发的软件软件系统结合使用。通过这种技术，可以识别小型矿物质并分析矿物质之间的取向关系。（2）从巴西的碱 - 碳酸盐岩复合物获得的许多稀土矿物质都是通过X射线衍射，扫描显微镜，Photoson激活分析等矿物质，质地，风化，元素浓度等研究的。这些结果将可以预见放射性废物周围的岩石变化。（3）与海外科学家的国际合作，以讨论处置放射性废物的地质环境。 Tokonami有助于潜在有用的材料来密封岩石的裂缝。较少的