Characterization of a new commercial single crystal diamond detector for photon- and proton-beam dosimetry.
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.
Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis 46202, USA Present address: Division of Health Sciences, Osaka University Graduate School of Medicine, 1-7 Yamadaoka, Suita, Osaka 565-0871, Japan.
Yuichi
Y
Akino
Department of Radiation Oncology, Indiana University Health Proton Therapy Center, Bloomington 47408, USA Present address; Department of Radiation Physics, MD Anderson Cancer Center, 1515 Holocombe Blvd, Houston, Tx 77030, USA.
Archana
A
Gautam
Department of Radiation Oncology, Indiana University Health Proton Therapy Center, Bloomington 47408, USA.
Len
L
Coutinho
PTW-Freiburg GmbH, Loerracher Strasse 7, Freiburg 79115, Germany.
Jan
J
Würfel
Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis 46202, USA Department of Radiation Oncology, Indiana University Health Proton Therapy Center, Bloomington 47408, USA.
Indra J
IJ
Das
D017785:Photons / Q000627:therapeutic use; D011874:Radiometry / Q000145:classification / Q000295:instrumentation*
characterization; detector; dosimetry; microdiamond