Speaker
Description
Proton and Radiotherapy are leading particle therapy tactics used to combat chronic and malignant cancers. Ultra-high dose rate (UHDR) flash therapy, is a new treatment modality that is currently being studied by several groups. The treatment delivers high doses in a short period of time (40 Gy/s) and is highly effective against tumor cells while maintaining healthy cells. UHDR dosimetry presents a crucial challenge to detectors when performing proper quality assurance (QA) measurements.
This work aims to develop a high-resolution 2D solid-state detector for accurate QA clinical routine in particle therapy. Amongst semiconductor materials, amorphous silicon (aSi) is characterized by durable radiation hardness, thus it is a notable candidate for material to build the active region of a solid-state detector.
To build a solid-state-based detector that can handle a wide range of doses and dose rates delivered by particle beams, the following solution is thus investigated. The active region will comprise a p-n junction that is composed of a lightly n-doped bulk aSi ($N_n\approx 10^{16}$), and a highly p-doped implant ($N_p\approx10^{20}$). At this unbiased state, the detector can withstand large charges generated with flash measurement.
At lower doses, a reverse bias voltage, $V_{rb}=25V$, would be applied to fully deplete the detector $\approx 2 \mu m$, to grant a decent signal-to-noise ratio (SNR). Monte Carlo simulation will be used to compute the response of the active region.
| Primary experiment | P-SQUAD |
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