Radiographic Images By Solid State Ionography

Larry A. DeWerd; P. R. Moran

doi:10.1117/12.965408

23 December 1976 Radiographic Images By Solid State Ionography

Larry A. DeWerd, P. R. Moran

Proceedings Volume 0096, Application of Optical Instrumentation in Medicine V; (1976) https://doi.org/10.1117/12.965408
Event: Application of Optical Instrumentation in Medicine V, 1976, Washington, D.C., United States

Abstract

Solid state thermocurrent and radioconductivity (electrical conductivity during irradiation) experiments have indicated the feasibility of using ionic solids for radiographic imaging. In gaseous systems, the process is called ionography; the image is formed by collection and trapping of charge. A charge yield of about 10-10 coulomb/cm2-mR at a field of 105 V/cm was measured for Al203; the charge yield varies linearly with the electric field. This material also shows good charge sensitivity for the room temperature region. Gadolinium Gallium Garnet, although not as sensitive as Al203, has also shown potential for radiographic imaging. Ionographic images were made at atmospheric pressure using 80 kVp x-rays collecting the charge on an aluminum backed mylar film. The aluminum backing electrode is then removed to produce a transparency, which can then be viewed as a conventional radiographic image. An image of a JEDEC-JT-4.2 pattern demonstrated that the imaging system can easily resolve 4 line pairs/mm and seems limited at our exposure levels only by quantum statistics.

Citation Download Citation

Larry A. DeWerd and P. R. Moran "Radiographic Images By Solid State Ionography", Proc. SPIE 0096, Application of Optical Instrumentation in Medicine V, (23 December 1976); https://doi.org/10.1117/12.965408

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