X-ray detection by epitaxial CVD diamond for medical radiology applications

C. Manfredotti; Y. Garino; L. Visca; A. Lo Giudice

doi:10.1117/12.736669

21 September 2007 X-ray detection by epitaxial CVD diamond for medical radiology applications

C. Manfredotti, Y. Garino, L. Visca, A. Lo Giudice

Proceedings Volume 6706, Hard X-Ray and Gamma-Ray Detector Physics IX; 67060P (2007) https://doi.org/10.1117/12.736669
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

An epitaxial diamond detector obtained by CVD (Chemical Vapor Deposition) has been used in order to monitor X-ray pulses from a radiological portable X-ray generator commonly used in hospitals. X-ray maximum energies varied from 50 to 120 KeV, while (electron anodic current)x(time duration) products were in the range from 20 to 100 mAs. Current pulses were recorded and from their shapes the timing and the collected charge were calculated and compared with those obtained by standard 6 cm³ ionization chambers and by a silicon diode arrays used in quality assurance programs for radiological X-ray apparatuses. Both diamond detector and silicon array display a standard deviation in time recording of 0.3% in the time range from 0.15 up to 2.5 s. The integrated current recorded from diamond is linear with respect the dose recorded by the ionization chamber from 5 up to 125 mGy, with a standard deviation on single points of the order of 0.5%. The stability of the detector is very good even without a priming treatment generally used in order to stabilize diamond dosimeters. Homogeneity of the detector in terms of its response was tested by means of alpha particles, which indicate an energy resolution of 0.7%, quite close to that of a standard surface barrier silicon detector. These results indicate that epitaxial diamond could be considered ready to be used in standard quality control procedures concerning radiological X-ray apparatuses.

Citation Download Citation

C. Manfredotti, Y. Garino, L. Visca, and A. Lo Giudice "X-ray detection by epitaxial CVD diamond for medical radiology applications", Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 67060P (21 September 2007); https://doi.org/10.1117/12.736669

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