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- W2792580280 abstract "A PR60020 silicon diode detector (PTW-Freiburg, Germany) was tested at INFN-LNS cyclotron on the scattered proton beamline (62 MeV) dedicated to ocular treatments. For the first time, the detector was also characterized in scanning proton beams accelerated by the CNAO synchrotron (63–229 MeV). The characteristics of the diode detector for proton beam dosimetry were investigated in terms of response stability, linearity with dose and dependence on dose rate and beam quality. Depth–ionization curves were measured for unmodulated, unmodulated range-shifted beams and spread-out Bragg peaks (SOBP); results were compared with reference ones obtained with an ionization chamber. Output Factors of narrow beams used in ocular proton-therapy were measured and compared to those achieved using EBT3 films. The PR60020 diode showed a reproducible response as for short-term precision (0.5%) and medium-term stability (1.5%). Dose and dose rate dependence measurements showed deviations from linearity within ±1%. The calibration factor (Gy/nC) was constant within ±1% over the range of proton beam qualities of ocular proton-therapy, while 1.4% maximum variation of diode sensitivity among CNAO energies was found. Output factors agreed with reference ones within 2% down to 5 mm collimator diameter. Bragg peak curves closely matched those acquired with ionization chamber, relative differences being lower than 3% in peak-to-plateau ratios. Very good results were also found for SOBP dose measurements as in scattered and scanned proton beams. In conclusion, diode detector appeared suitable for relative dosimetry and absorbed dose determination in passively scattered and scanning clinical proton beams, particularly for very small fields used for ocular treatments." @default.
- W2792580280 created "2018-03-29" @default.
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- W2792580280 date "2018-05-01" @default.
- W2792580280 modified "2023-10-14" @default.
- W2792580280 title "Dosimetric characterization of a silicon diode detector in cyclotron-based passively scattered and synchrotron-based scanning clinical proton beams" @default.
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- W2792580280 doi "https://doi.org/10.1016/j.nima.2018.02.083" @default.
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