arXivDaily arXiv每日学术速递 周一至周五更新
arXiv physics/0608248physics.ins-detphysics.acc-ph
收藏

半导体高能辐射闪烁探测器

Semiconductor High-Energy Radiation Scintillation Detector

A. Kastalsky, S. Luryi, B. Spivak

摘要:

我们提出了一种新的双折射型探测器,其中高能辐射在直接带隙半导体材料中产生电子空穴对,该电子空穴对随后重新组合产生要由光电探测器记录的红外线。关键问题是如何使半导体对自身的红外线基本透明,这样半导体内部深处产生的光子就可以到达其表面而不会有明显的衰减。我们讨论了两种方法来实现这一点,一个基于掺杂的半导体与浅杂质的一种极性类型,最好是捐助者,其他异质结构带隙工程。所提出的半导体闪烁体结合了目前现有的辐射探测器的最佳特性,并且可以用于简单的辐射监测(如盖革计数器)和用于高能辐射的高分辨率光谱学。所提出的检测器的最重要的优点是其快速的响应时间,约1纳秒,基本上只受少数载流子的复合时间的限制。值得注意的是,快速响应没有任何亮度下降。当闪烁体以合格的半导体材料(诸如InP或GaAs)实现时,光电探测器和相关联的电路可以外延地集成在闪烁体板上,并且该结构可以堆叠以实现几乎任何期望的吸收能力。

英文摘要:

We propose a new scintillation-type detector in which high-energy radiation produces electron-hole pairs in a direct-gap semiconductor material that subsequently recombine producing infrared light to be registered by a photo-detector. The key issue is how to make the semiconductor essentially transparent to its own infrared light, so that photons generated deep inside the semiconductor could reach its surface without tangible attenuation. We discuss two ways to accomplish this, one based on doping the semiconductor with shallow impurities of one polarity type, preferably donors, the other by heterostructure bandgap engineering. The proposed semiconductor scintillator combines the best properties of currently existing radiation detectors and can be used for both simple radiation monitoring, like a Geiger counter, and for high-resolution spectrography of the high-energy radiation. The most important advantage of the proposed detector is its fast response time, about 1 ns, essentially limited only by the recombination time of minority carriers. Notably, the fast response comes without any degradation in brightness. When the scintillator is implemented in a qualified semiconductor material (such as InP or GaAs), the photo-detector and associated circuits can be epitaxially integrated on the scintillator slab and the structure can be stacked-up to achieve virtually any desired absorption capability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑