Application of commercial MOSFET detectors for in vivo dosimetry in the therapeutic x-ray range from 80 kV to 250 kV.

摘要: The purpose of this study was to investigate the dosimetric characteristics (energy dependence, linearity, fading, reproducibility, etc) MOSFET detectors for in vivo dosimetry kV x-ray range. experience a pre-clinical using Alderson phantom and clinical practice is also reported. All measurements were performed with Gulmay D3300 unit TN-502RDI detectors. For determination correction factors different solid phantoms calibrated Farmer-type chamber used. signal linear applied dose range from 0.2 2 Gy all energies. Due fading it recommended read during first 15 min after irradiation. long time intervals between irradiation readout can vary largely detector. temperature dependence detector small (0.3% °C−1) 22 40 °C. variation measuring beam incidence amounts ±5% should be considered applications. Finally, entrance energy-dependent calibration factors, field size irradiated cable length applied. overall accuracy, measurements, dominated by reproducibility as function dose. During study, agreement TLD well within 3%. results determine applications, showed that are suitable However, some effects need corrected for. at low levels accurate only possible if equal or larger than Gy.