NOVEL SILICON DETECTORS FOR EXAFS STUDIES

用于 EXAFS 研究的新型硅探测器

• 批准号: 2649443
• 负责人: MICHAEL R. SQUILLANTE
• 金额: $ 10万
• 依托单位: RADIATION MONITORING DEVICES, INC.
• 依托单位国家: 美国
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 1999-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2649443
• 关键词: X ray spectrometry; biomedical equipment development; electrodes; method development; radiation detector; silicon

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

高强度同步加速器X射线源的可用性使得 可能的先进研究的生物材料使用的方法，X- X射线吸收光谱（XAS）。这些进步，无论是在强度上， 以及这些光源的光学特性，使得利用超 稀释光谱和荧光QuEXAFS技术。但却 有人指出，"限制进展的唯一最重要问题是， 在生物xAS中，需要开发新的X射线探测器。 [BioSync]. 大多数生物学实验不受现有条件的限制 X射线通量，而是由可用的X射线探测器的特性决定的。 现代XAS仪器设计的核心是非常低的噪声 X射线探测器，它必须探测来自 样品重要的是，检测器在非常高的温度下工作。 能量分辨率，并在非常高的计数率下保持该分辨率。 这要求检测器具有非常低的噪声和低电容。 我们建议研究一种新的检测器设计， 硅作为探测器材料，并具有新颖的电极结构 其即使对于大面积器件也提供非常低的电容。因此，在本发明中， 这种装置设计应该能够提供极好的能量， 分辨率，即使在高计数率，这是一个基本要求， EXAFS。第一阶段项目旨在证明可行性 提出的概念。 拟议的商业应用： 同步加速器研究，环境探测，无损检测， 天文学、医疗仪器和探测器、物理学研究