A novel synthetic single crystal diamond device for in vivo dosimetry

Marco Marinelli, G. Prestopino, A. Tonnetti, C. Verona, G. Verona-Rinati, M.D. Falco, P. Bagalà, M. Pimpinella, A.S. Guerra, V. De Coste

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Abstract

Purpose: Aim of the present work is to evaluate the synthetic single crystal diamond Schottky photodiode developed at the laboratories of "Tor Vergata" University in Rome in a new dosimeter configuration specifically designed for offline wireless in vivo dosimetry (IVD) applications. Methods: The new diamond based dosimeter, single crystal diamond detector (SCDD-iv), consists of a small unwired detector and a small external reading unit that can be connected to commercial electrometers for getting the detector readout after irradiation. Two nominally identical SCDD-iv dosimeter prototypes were fabricated and tested. A basic dosimetric characterization of detector performances relevant for IVD application was performed under irradiation with 60Co and 6 MV photon beams. Preirradiation procedure, response stability, short and long term reproducibility, leakage charge, fading effect, linearity with dose, dose rate dependence, temperature dependence, and angular response were investigated. Results: The SCDD-iv is simple, with no cables linked to the patient and the readout is immediate. The range of response with dose has been tested from 1 up to 12 Gy; the reading is independent of the accumulated dose and dose rate independent in the range between about 0.5 and 5 Gy/min; its temperature dependence is within 0.5% between 25 and 38 °C, and its directional dependence is within 2% from 0° to 90°. The combined relative standard uncertainty of absorbed dose to water measurements is estimated lower than the tolerance and action level of 5%. Conclusions: The reported results indicate the proposed novel offline dosimeter based on a synthetic single crystal diamond Schottky photodiode as a promising candidate for in vivo dosimetry applications with photon beams.
Original languageEnglish
Pages (from-to)4636 - 4644
Number of pages9
JournalMedical Physics
Volume42
Issue number8
DOIs
Publication statusPublished - 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

Marinelli, M., Prestopino, G., Tonnetti, A., Verona, C., Verona-Rinati, G., Falco, M. D., ... De Coste, V. (2015). A novel synthetic single crystal diamond device for in vivo dosimetry. Medical Physics, 42(8), 4636 - 4644. https://doi.org/10.1118/1.4926556