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Vacuum Design of An X-Ray Camera Using Triboelectric X-Ray Spectra

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J Romo-Espejel

E. Ulises Moya-Sanchez1, J.A. Romo-Espejel2*, (1) Cinvestav-Gdl, Zapopan, ,(2) Universidad de Guadalajara, Guadalajara,

SU-E-I-92 Sunday 3:00PM - 6:00PM Room: Exhibit Hall

Purpose: Design a low-energy X-ray imaging system with the method of triboelectric X-rays with same penetration levels as a conventional X-ray tube, intended for low-energy diagnostics such as mammography.

Methods: The results from triboelectric X-rays experiments obtained by Camara and Hird, were characterized in terms of the beam penetration, using the Mo target data measured by Hird and Camara and the parametrized spectra data of an X-ray tube with Mo anode that was computed with an equation proposed by J. Boone. Later, a vacuum chamber was built to reproduce a triboelectric X-ray source, with a PMMA (C₅O₂H₈)₆ (1.19 g/cm³) and black Naylamid (1.16 g/cm³), and the thickness of the wall needed to be computed in order to obtain same penetration efficiency levels.

Results: The results of the computation of HVL for both spectra were similar in respect to Al thickness, the HVL of the triboelectric source resulting in 0.17 mm of Al and from the X-ray tube in 0.22 mm of Al. The same HVL of both spectrum is given when 32 kV are applied to the X-ray tube. The vacuum chamber that was built had 6 mm of PMMA wall thickness. An electronic circuit has been designed to build a radiation detector in order to provide a full imaging system with a triboelectric X-ray source and imaging detector.

Conclusion: According to our computations it is possible to obtain a HVL from a triboelectric X-ray source, same to a HVL from an X-ray tube with enough beam penetration to obtain a low-energy medical diagnostic image.

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