NOVEL SILICON DETECTORS FOR EXAFS STUDIES

强同步辐射X射线源的可获得性使 利用X-射线衍射法对生物材料进行进一步研究的可能性 射线吸收光谱(XAS)。进步，无论是在强度上，还是在 以及这些光源的光学特性，使人们有可能利用超 稀释光谱和荧光QuEXAFS技术。然而，它已经 有人指出，“限制进展的唯一最重要的问题 在生物XAS中，需要开发新的X射线探测器。 [生物合成]。大多数生物实验都受到限制，而不是受可获得的 X射线通量，但取决于现有的X射线探测器的特性。 现代XAS仪器设计的核心是非常低的噪音 X射线探测器，它必须检测来自 样本。探测器在非常高的温度下运行是很重要的 能量分辨率，并在非常高的计数速率下保持该分辨率。 这就要求探测器具有非常低的噪声和低电容。 我们建议研究一种使用高纯度的新型探测器设计 以硅为探测器材料，具有新颖的电极结构 这即使对于大面积的器件也提供了非常低的电容。因此， 这种装置的设计应该能够提供极好的能量 即使在高计数率下的分辨率，这也是 EXAFS。第一阶段项目的目的是证明其可行性 所提议的概念。 建议的商业应用： 同步加速器研究，环境探测，无损检测， 天文学、医学仪器和探测器、物理学研究

The availability of intense sources of synchrotron X-rays has made possible advanced studies of biological materials using the method of X- ray absorption spectroscopy (XAS). The advances, both in intensity as well as optics of these sources, has made it possible to exploit ultra- dilute spectroscopy and fluorescence QuEXAFS techniques. However, it has been pointed out that "The single most important issue limiting progress in biological xAS is the need for the development of new X-ray detectors" [BioSync]. Most biological experiments are limited not by the available X-ray flux, but by the characteristics of the available X-ray detectors. Central to the design of modern XAS instrumentation is a very low noise X-ray detector, which must detect the fluorescence X-rays from the samples. It is important for the detector to operate with very high energy resolution and maintain that resolution at very high count-rates. This requires the detector to have very low noise and low capacitance. We propose to investigate a novel detector design which uses high purity silicon as the detector material and has a novel electrode structure which provides very low capacitance even with large area devices. Thus, this device design should be capable of providing excellent energy resolution even at high count-rates which is an essential requirement for EXAFS. The Phase I project will be aimed at demonstrating the feasibility of the proposed concept. PROPOSED COMMERCIAL APPLICATIONS: Synchrotron studies, environmental exploration, non-destructive testing, astronomy, medical instrumentation and probes, physics research