Amorphous selenium based detectors for medical imaging applications

Krishna C. Mandal; Sung Hoon Kang; Michael Choi; Gerald E. Jellison Jr.

doi:10.1117/12.683817

14 September 2006 Amorphous selenium based detectors for medical imaging applications

Krishna C. Mandal, Sung Hoon Kang, Michael Choi, Gerald E. Jellison Jr.

Proceedings Volume 6319, Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII; 63190N (2006) https://doi.org/10.1117/12.683817
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We have developed and characterized large volume amorphous (a-) selenium (Se) stabilized alloys for room temperature medical imaging devices and high-energy physics detectors. The synthesis and preparation of well-defined and high quality a-Se (B, As, Cl) alloy materials have been conducted using a specially designed alloying reactor at EIC and installed in an argon atmosphere glove box. The alloy composition has been precisely controlled and optimized to ensure good device performance. The synthesis of large volume boron (B) doped (natural and isotopic ¹⁰B) a-Se (As, Cl) alloys has been carried out by thoroughly mixing vacuum distilled and zone-refined (ZR) Se with previously synthesized Se-As master alloys, Se-Cl master alloys and B. The synthesized a-Se (B, As, Cl) alloys have been characterized by x-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infra-red spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectroscopy (ICP-MS), and detector testing. The a- Se alloys have shown high promise for x-ray detectors with its high dark resistivity (10¹⁰-10¹³ Ωcm), good charge transport properties, and cost-effective large area scalability. Details of various steps about detector fabrication and testing of these imaging devices are also presented.

Citation Download Citation

Krishna C. Mandal, Sung Hoon Kang, Michael Choi, and Gerald E. Jellison Jr. "Amorphous selenium based detectors for medical imaging applications", Proc. SPIE 6319, Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII, 63190N (14 September 2006); https://doi.org/10.1117/12.683817

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