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CVD diamond wires as x-ray detectors.

Mat. Res. Soc. Symp. Proc., Vol. 423, San Francisco (CA), April 8-12 1996, p. 81-86
C. Manfredotti, F.Fizzotti, M. Galetto, A. Lo Giudice, D. Margherita, C. Ongaro, P.Polesello, E.Vittone
†Università di Torino, Dip. di Fisica Sperimentale, INFN-Sezione di Torino, via P. Giuria 1, I-10125 Torino Italy
Keywords: HFCVD, diamond growth, electrical properties, x-ray detector

ABSTRACT

Miniature metal-diamond wire detectors have been fabricated by Hot Filament Chemical Vapor Deposition (HFCVD) method and characterized as x-ray dosimeters in the energy range 50 keV - 250 keV. Linearuty of the response and the sensitivity as a function of energy have been accurately determined in a range routinely used for x-ray radiotherapy. With a Mo wire substrate, a 10 mm thick CVD diamond film can reach sensitivities of the order of 4 10-8 A/Gy/min, more than one order of magnitude larger than for a 6 cm3 standard ionization chamber.