title: A novel synthetic single crystal diamond device for in vivo dosimetry.
abstract: OBJECTIVE
  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 (60)Co 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.
authors.affiliation: INFN-Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata," Via del Politecnico 1, Roma 00133, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Marinelli
authors.affiliation: INFN-Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata," Via del Politecnico 1, Roma 00133, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Prestopino
authors.affiliation: INFN-Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata," Via del Politecnico 1, Roma 00133, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Tonnetti
authors.affiliation: INFN-Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata," Via del Politecnico 1, Roma 00133, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Verona
authors.affiliation: INFN-Dipartimento di Ingegneria Industriale, Università di Roma "Tor Vergata," Via del Politecnico 1, Roma 00133, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Verona-Rinati
authors.affiliation: Department of Diagnostic Imaging, Molecular Imaging, Interventional Radiology and Radiotherapy, Tor Vergata University General Hospital, Viale Oxford 81, Roma 00133, Italy.
authors.forename: M D
authors.initials: MD
authors.lastname: Falco
authors.affiliation: Department of Diagnostic Imaging, Molecular Imaging, Interventional Radiology and Radiotherapy, Tor Vergata University General Hospital, Viale Oxford 81, Roma 00133, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Bagalà
authors.affiliation: Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, ENEA-INMRI C R Casaccia, Via Anguillarese 301, Roma 00123, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Pimpinella
authors.affiliation: Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, ENEA-INMRI C R Casaccia, Via Anguillarese 301, Roma 00123, Italy.
authors.forename: A S
authors.initials: AS
authors.lastname: Guerra
authors.affiliation: Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, ENEA-INMRI C R Casaccia, Via Anguillarese 301, Roma 00123, Italy.
authors.forename: V
authors.initials: V
authors.lastname: De Coste
mesh_terms: D003037:Cobalt Radioisotopes; D018130:Diamond; D004867:Equipment Design; D016014:Linear Models; D017785:Photons; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D013696:Temperature; D059015:Wireless Technology / Q000295:instrumentation
chemical_list: D003037:Cobalt Radioisotopes; D018130:Diamond