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InAlN/GaN Detectors for Real-Time Dosimetry in Ultra-High Dose Rate FLASH Radiotherapy.

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|February 2, 2026
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Summary
This summary is machine-generated.

New InAlN/GaN-on-Si detectors show promise for FLASH radiotherapy. These solid-state detectors can monitor individual radiation pulses in real-time, offering high sensitivity and speed for advanced cancer treatments.

Keywords:
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Area of Science:

  • Semiconductor physics
  • Radiation detection
  • Medical physics

Background:

  • FLASH radiotherapy requires advanced dosimetry systems for real-time monitoring.
  • Existing detectors face limitations in speed and sensitivity for ultra-high dose-per-pulse (UH-DPP) applications.

Purpose of the Study:

  • To characterize InAlN/GaN-on-Si solid-state detectors under UH-DPP electron irradiation.
  • To evaluate their suitability for clinical FLASH radiotherapy dosimetry.

Main Methods:

  • Testing unpassivated Ni/Au metal-semiconductor-metal (MSM) and two-dimensional electron gas (2DEG) interdigital transducer (IDT) detectors.
  • Irradiation with UH-DPP electron beams.
  • Analysis of transient performance, signal-to-noise ratio (SNR), and dose-dependent voltage responses.

Main Results:

  • 2DEG IDT detectors demonstrated superior transient performance, resolving 3 μs rise and 325 μs fall times.
  • Achieved SNR exceeding 220 under 2 Gy pulses.
  • Showed consistent, dose-dependent responses with high sensitivity (0.5-0.9 V/Gy) and normalized sensitivity (48.75 nC/Gy/mm²), outperforming SiC and diamond detectors.

Conclusions:

  • InAlN/GaN detectors are highly promising for compact, high-speed, radiation-tolerant dosimetry.
  • They enable real-time single-pulse monitoring crucial for clinical FLASH radiotherapy.
  • These detectors represent a significant advancement for advanced radiation therapy applications.