Abstract
A synthetic single crystal diamond detector (SCDD) is commercially available and is characterized for radiation dosimetry in various radiation beams in this study. The characteristics of the commercial SCDD model 60019 (PTW) with 6- and 15-MV photon beams, and 208-MeV proton beams, were investigated and compared with the pre-characterized detectors: Semiflex (model 31010) and PinPoint (model 31006) ionization chambers (PTW), the EDGE diode detector (Sun Nuclear Corp) and the SFD Stereotactic Dosimetry Diode Detector (IBA). To evaluate the effects of the pre-irradiation, the diamond detector, which had not been irradiated on the day, was set up in the water tank, and the response to 100 MU was measured every 20 s. The depth–dose and profiles data were collected for various field sizes and depths. For all radiation types and field sizes, the depth–dose data of the diamond chamber showed identical curves to those of the ionization chambers. The profile of the diamond detector was very similar to those of the EDGE and SFD detectors, although the Semiflex and PinPoint chambers showed volume-averaging effects in the penumbrae region. The temperature dependency was within 0.7% in the range of 4–41°C. A dose of 900 cGy and 1200 cGy was needed to stabilize the chamber to the level within 0.5% and 0.2%, respectively. The PTW type 60019 SCDD detector showed suitable characteristics for radiation dosimetry, for relative dose, depth–dose and profile measurements for a wide range of field sizes. However, at least 1000 cGy of pre-irradiation will be needed for accurate measurements.
Highlights
Finding a perfect detector with wide applications in radiation fields has always been elusive
Accurate dosimetry of small fields is challenging because the finite range of detectors leads to volume-averaging effects with various types of perturbations [4,5,6,7,8]
Synthetic diamonds produced by chemical vapor deposition (CVD) [17, 18] have been considered for Characterization of diamond detector
Summary
Finding a perfect detector with wide applications in radiation fields has always been elusive. Improvements in detector characteristics for radiation ( photon, electron and protons), dose, dose rate and fields (small and large) has been steadily pursued. Advances in treatment techniques like stereotactic radiotherapy (SRT), CyberKnife, Gamma Knife, Tomotherapy, intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT) have created an urgency for suitable detectors for small-field dosimetry [1,2,3]. Natural diamond detectors have been extensively studied and found to have suitable characteristics for dosimetry [11,12,13,14,15,16]. Natural diamond detectors, even those with superior characteristics, have become obsolete due to poor design, selection of crystal, and craftsmanship and to cost. Synthetic diamonds produced by chemical vapor deposition (CVD) [17, 18] have been considered for
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