Recent advances with mercuric iodide x-ray detectors and large-area silicon avalanche photodiodes

Andrzej J. Dabrowski; Jan S. Iwanczyk; Yuzhong J. Wang; Michael C. Madden; Marek Szawlowski

doi:10.1117/12.161927

22 October 1993 Recent advances with mercuric iodide x-ray detectors and large-area silicon avalanche photodiodes

Andrzej J. Dabrowski, Jan S. Iwanczyk, Yuzhong J. Wang, Michael C. Madden, Marek Szawlowski

Proceedings Volume 2007, Scintillating Fiber Technology and Applications; (1993) https://doi.org/10.1117/12.161927
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The paper presents advances in two sensor technologies: (1) Mercuric Iodide (HgI₂) X-ray Detector Technology and, (2) Large Area Silicon Avalanche Photodiode (APD) Technology, which after years of development have recently produced commercially viable devices. Large Area Silicon Avalanche Photodiodes, which are solid-state light sensitive devices with internal amplification, combine the convenience, ruggedness and low power consumption of traditional semiconductor p-n and p-i-n photodiodes with the high light sensitivity and large photosensitive area approaching the active areas of traditional vacuum photomultiplier tubes. Device approaching 1-inch diameter with internal gain of up to 1000, have been developed by utilizing a beveled edge structure. By combining APD's with scintillation crystals, resolution of 6% (FWHM) was obtained for 662 keV energy line of ¹³⁷Cs using a CsI(Tl) scintillator, and 7% (FWHM) was obtained using a NaI(Tl) scintillator. Resolution of 14% (FWHM) at room temperature and 11% (FWHM) at 0 degree(s)C have been obtained for APD's coupled to BGO scintillators. Rise times of 3 ns were measured by applying an impulse signal input, to a 200 mm² device.

Citation Download Citation

Andrzej J. Dabrowski, Jan S. Iwanczyk, Yuzhong J. Wang, Michael C. Madden, and Marek Szawlowski "Recent advances with mercuric iodide x-ray detectors and large-area silicon avalanche photodiodes", Proc. SPIE 2007, Scintillating Fiber Technology and Applications, (22 October 1993); https://doi.org/10.1117/12.161927

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