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

高级放射性废物在很长一段时间内将使用的核燃料重新加工为远离人类和动物的紧急情况。在这个项目中，没有得到强烈促进。在这个项目中，与放射性废物相关的矿物质主要研究了，因为在地质上很长一段时间后，可能会观察到纹理废物的质地，我们研究了放射性矿物质或稀有矿物质。为了显示放射性的特征。可用的拖曳扩散，例如50mum，它可以通过单晶衍射技术从10MUM区域获得晶体学信息，从而获得晶体学信息。 Gonionter与开发的软件系统结合使用，通过矿物质组装，风化，元素收缩等，研究巴西的碳酸盐岩中的Oriance关系。等等。