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Experimental Approach for Study on Mechanism of Formation and Growth of Nanometer-Sized Cesium Compounds

纳米铯化合物形成和生长机理研究的实验方法

基本信息

批准号：
10680485
负责人：
KUGA Yoshikazu
金额：
$ 2.18万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

First, formation of nanometer-sized silver particles, which were one of the fission products, was systematically carried out as model particles of cesium compound particles mainly included in the fission products in a recycle process for nuclear fuel used in a light-water reactor. Although the values of the volumetric average diameter, DィイD2V, DMA ィエD2, obtained by our differential mobility analyzer under low pressure conditions ranging from 123 to 300 Torr developed in this study, were approximately 7% larger than those of the volumetric average diameter, DィイD2V, TEMィエD2, obtained from the transmission electron microscope (TEM) observation results of the silver particles collected at the DMA inlet, both the DMA and TEM size measurements were found to be in good agreement. The theoretical sizes calculated from the operation conditions for the DMA were also found to be in good agreement with those of DィイD2V, TEMィエD2 obtained from the TEM observation results of the silver particles colle … More cted after the classification by the DMA in the range from 6 to 25 nm, although the theoretical sizes set by the DMA were approximately 14% larger than those of DィイD2V, TEMィエD2 measured from the TEM observation results after the classification by the DMA.Second, the geometric standard deviations of the size distributions obtained from the TEM images after classification were found to range from 1.08 to 1.17, and they were approximately equal to the theoretical value (1.093) of the particles classified by the DMA, where as the geometric standard deviations of the size distributions obtained from the TEM images before the classification ranged from 1.34 to 1.50 and were greater than those after classification.Additionally, a generator for cesium iodide particles which consisted of typical fission products, namely cesium and iodine , was developed, and nanometer- sized cesium iodide particles were formed and their size distributions were measured by the DMA The particle size ranged from 5 to 100 nm (or larger) and was found to increase with an increase in the furnace temperature at the generator. The concentration of formed particles was slightly increased with the increase in the furnace temperature. We also demonstrated the validity of our DMA system for size measurements and the classification of the nm- sized cesium iodide particles as similar to the case s of silver particles. Less

首先，在轻水反应堆中使用的核燃料的再循环过程中，作为主要包含在裂变产物中的铯化合物粒子的模型粒子，系统地进行了作为裂变产物之一的纳米尺寸银粒子的形成。虽然在本研究中开发的123至300托的低压条件下通过我们的差示迁移率分析仪获得的体积平均直径D_（max）D2 V，DMA_（max）D2的值比体积平均直径D_（max）D2 V，TEM_（max）D2的值大约7%，从在DMA入口处收集的银颗粒的透射电子显微镜（TEM）观察结果获得，发现DMA和TEM尺寸测量都很一致。根据DMA操作条件计算出的理论尺寸与根据银颗粒colle的TEM观察结果获得的DイD 2 V、TEM D2的理论尺寸也非常一致 ...更多信息通过DMA分级后在6 ~ 25 nm的范围内进行的TEM观察结果表明，虽然DMA设定的理论尺寸比D2 V的理论尺寸大约14%，但从DMA分级后的TEM观察结果测得的TEM尺寸为D2。从分类后的TEM图像获得的尺寸分布的几何标准偏差的范围为1.08 - 1.17，它们近似等于理论值（1.093），其中分级前TEM图像粒度分布的几何标准偏差为1.34 ~ 1.50，大于分级后的几何标准偏差。此外，还制备了由典型裂变产物组成的碘化铯粒子发生器，即铯和碘，并形成纳米尺寸的碘化铯颗粒，并通过DMA测量它们的尺寸分布。颗粒尺寸在5至100 nm（或更大）的范围内，并发现随着发生器处的炉温的增加而增加。随着炉内温度的升高，生成颗粒的浓度略有增加。我们还证明了我们的DMA系统的有效性的尺寸测量和分类的纳米级碘化铯颗粒的情况下类似的银颗粒。少