Amorphous silicon detectors for proton beam monitoring in FLASH radiotherapy
arxiv(2024)
摘要
Ultra-high dose rate radiation therapy (FLASH) based on proton irradiation is
of major interest for cancer treatments but creates new challenges for dose
monitoring. Amorphous hydrogenated silicon is known to be one of the most
radiation-hard semiconductors. In this study, detectors based on this material
are investigated at proton dose rates similar to or exceeding those required
for FLASH therapy. Tested detectors comprise two different types of contacts,
two different thicknesses deposited either on glass or on polyimide substrates.
All detectors exhibit excellent linear behaviour as a function of dose rate up
to a value of 20 kGy/s. Linearity is achieved independently of the depletion
condition of the device and remarkably in passive (unbiased) conditions. The
degradation of the performance as a function of the dose rate and its recovery
are also discussed.
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