ESTRO 2025 - Abstract Book

S2582

Physics - Detectors, dose measurement and phantoms

ESTRO 2025

hypothesis that saturation observed in the W2 is due to limitations of the electrometer rather than the scintillator itself.

Material/Methods: We conducted a series of measurements to assess the performance of a W2-1x3 detector and a BCF-12 scintillator (1x2mm) under 9MeV electron beams. The experiment was carried out using a spectrometer capable of handling a wide range of signal intensities. The area under the curve was computed for each spectrum and used to compare across all measurement setups. To investigate the behavior of the detector to variations in PRF, we adjusted the PRF values from 10Hz to 120Hz. The linearity to integrated dose was validated by varying the number of pulses per acquisition. Additionally, we tested the linearity of the detector’s response to DPP by changing the surface-to-source distance up to a DPP = 5.4Gy. Results: The signal sensitivity for BCF-12 remained under 6% for all PW values tested across all PRF. Whereas for the W2 1x3, the maximum decrease found in signal sensitivity was for PW=2ms at 60Hz (Fig.1).

The linearity of the detector’s response was maintained across all pulse numbers tested. Both detectors response remained linear with respect to both integrated dose and DPP (Fig.2).