Thallium Bromide X-ray Photocathodes

溴化铊 X 射线光电阴极

• 批准号: 8960774
• 负责人: Michael Squillante
• 金额: $ 5万
• 依托单位: Radiation Monitoring Devices Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8960774&HistoricalAwards=false
• 关键词: Thallium; Bromide; ray; Photocathodes

X-ray photocathodes are used in a large number of X-ray imaging systems, mainly in the fields of astronomy and medical imaging. In most applications, X-ray photocathodes are used in conjunction with a microchannel plate (MCP) and a position- sensitive detector. Devices incorporating this combination are capable of imaging X-rays with very high spatial and temporal resolution. Many different X-ray photocathode materials have been developed to date. These materials have usually been alkali-halides (e.g., Csl or CsBr) and tend to be hygroscopic in nature. For this reason special handling and treatment of these materials is necessary to prevent them from degradation in the laboratory. In addition, X-ray imaging systems employing these materials as X-ray photocathodes suffer from low sensitivity and very poor energy resolution. The purpose of this work is to develop the semi-insulating semiconductor material thallium bromide (TlBr) for use as an X- ray photocathode. The development of this material would lead to a significant improvement in the utility of devices employing X- ray photocathodes.

X射线光阴极被大量用于X射线 成像系统，主要用于天文学和医学领域 显像 在大多数应用中，X射线光电阴极用于 结合微通道板（MCP）和位置- 灵敏探测器 包含该组合的装置是 能够以非常高的空间和时间分辨率对X射线成像， 分辨率 许多不同的X射线光阴极材料具有 发展至今。 这些材料通常 碱金属卤化物（例如，CsI或CsBr），并且在 自然 因此，特别处理和处理这些 材料是必要的，以防止他们在降解 实验室 此外，采用这些技术的X射线成像系统 作为X射线光电阴极的材料具有低灵敏度， 非常差的能量分辨率。 本工作的目的是开发半绝缘 半导体材料溴化铊（TlBr），用作X- 射线光电阴极 这种材料的发展将导致 使用X-射线的设备的实用性的显著改进， 射线光电阴极