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扫描电子显微镜

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扫描电镜应用之:核废料化学研究程序  

2011-03-23 10:57:02|  分类: 默认分类 |  标签: |举报 |字号 订阅

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 日本地震造成的核电站危机,引起世界人民的广泛深入关注,借此机会也找了一篇与扫描电镜相关文章分享一下!

The Centre for Radiochemistry Research, The University of Manchester 曼彻斯特大学放射化学研究中心
       驰奔  编辑

In the UK 50 years of nuclear power have left a legacy of radioactive wastes and problems that need to be treated. UK Government policy is that these wastes will be made safe and disposed of in an underground repository. The Nuclear Waste Chemistry research programme addresses these issues, and includes:

      英国50年的核能利用遗留下放射性废物和问题需要处理。英国政府的政策是将这些废料深埋地下安全储存。核废料化学研究程序定位这些问题,包括:

defining the physical and chemical form of radionuclides in nuclear fuel storage ponds, especially the composition and behaviour of Magnox fuel corrosion products and sludges;
assessing the performance of glass, cement and polymer wasteforms and the development of novel encapsulants;
devising decontamination methods for contaminated surfaces;
developing mechanistic speciation models to support safety cases for waste repositories.
定义核燃料储存室放射性的物理化学形态,特别是镁合金核燃料腐蚀产物和混合物的成分和表象形式。
评估玻璃、水泥、聚合物废料包裹形态,发展新的密封材料。
设计污染表面的净化方法。
发展保证核废料储存的安全箱的机械模型性能。

 

Some examples of our work in Nuclear Waste Chemistry programme are given below.
     以下是我们在核废料化学程序工作的例子
Example 1: Performance During Leaching of Pu Containing Cement Pellets
例1:包含水泥微粒的装置在沥滤过程中的性能

Pu pellet and Pu map

There are many proposed wasteforms for the immobilisation of radioactive materials. It important to examine their behaviour so that the most suitable form can be selected. Cements have been suggested as potential materials for waste immobilisation. The image on the far left shows a test plutonium containing cement pellet that was produced in the Centre labs. To the right of the pellet is a map of the plutonium distribution in part of the pellet after it had been leached. The map was determined by synchrotron X-ray fluorescence. Experiments such as this allow us to assess the most appropriate materials for waste disposal. 
       针对放射性材料废料的固定,有许多推荐的废料形态。检测这些形态的运行状况,以便于选择最适合的形式是很重要的。上左图显示在中心实验室中制造的包含在水泥颗粒中的钚的试验样块。右图是样块沥滤后采用同步辐射检测到钚元素的分布。面分布是采用电子回旋加速器同步辐射产生的X射线荧光决定的。这样的试验给予我们评价最适合的核废料处理材料。

Example 2: Novel Ceramic Wasteforms
例2:革新的陶瓷废料包裹形态。

Matt Gilbert making novel wasteforms at ITU-Karlsruhe
Ceramics are alternative wasteforms to cements. The picture on the right shows a former CRR Ph.D. student (Dr Matt Gilbert) making new plutonium containing zirconolites (a ceramic) materials in the labs of the European Union labs at ITU Karlsruhe (Germany). Matt’s project was a collaboration with Neil Hyatt at the University of Sheffield. This joint project was the template for the Nuclear FiRST Doctoral Training Centre. The image at the top right of this page shows an SEM image of one of Matt’s plutonium containing materials.
Nuclear Waste Chemistry Research Programme核废料化学研究规划 - 驰奔 - ---DEMA 驰奔---

 

陶瓷是水泥核废料处理形式的替代选择。上图显示一个以前的学生在德国的一个欧盟实验室制作新的钛锆(一种陶瓷)材料进行钚封闭。

左图显示的是钚封闭材料扫描电镜照片。



 

 

 

 

 

Example 3: Colloids in the nuclear fuel cycle
例3:核燃料循环中的胶体

colloids caught on a filter

 

As well as studying the behaviour of materials that could be used to immobilise radioactive waste in an eventual geological disposal facility, we also have projects that are designed to assist and inform attempts to remediate and decommission nuclear sites in the UK. This part of our work is supported by the Nuclear Decommissioning Authority. Our aim is to provide information to allow the safe processing of hazardous legacy wastes and contaminated materials. The picture on the left shows small particles that are found in the water of nuclear fuel storage ponds (more information on Nick Bryan’s page).

和在研究能够用于固定封闭放射性废料材料情况一样,我们也有对英国退役的核电站进行帮助和通告努力的项目。我们这部分的工作是由原子能停运当局支持的。我们的目标是提供给予危险核废料产物和被污染的材料信息。左图(扫描电镜sem照片)显示在核燃料储存库的水中发现的小颗粒。(更多信息查看Nick Bryan’s page

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