Mr. Adam Dadey Profile

Adam Dadey

at Univ. of Virginia

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Proceedings Article | 8 October 2024 Presentation + Paper

Advances on radiation-tolerant Geiger photodiodes

Erik Johnson, Richard Blakeley, Matthew Downing, Adam Dadey, Joe Campbell

Proceedings Volume 13151, 1315109 (2024) https://doi.org/10.1117/12.3027514

KEYWORDS: Solid state photomultipliers, Diodes, Gallium arsenide, Silicon photomultipliers, Photomultipliers

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The operation of nuclear instruments in high-radiation environments is critical for a myriad of applications, which include intense particle beams for future science experiments, in-situ measurements for emerging and advanced nuclear fuel cycles, or operation in a diverse range of environmental and harsh radiation conditions for military applications. A common tool used to measure ionizing radiation is scintillation materials, which produce a light pulse with an intensity proportional to the energy deposited, where a photodetector is used to measure the light pulse. A photodetector sensitive enough for scintillator readout is the photomultiplier tube, yet these devices are typically bulky. Though SiPMs, formed from an array of single photon avalanche photodiodes, or Geiger photodiodes (GPD), are replacing photomultiplier tubes, they are susceptible to radiation damage. This work discusses new technologies of GPDs consisting of GaAs and AlGaAsSb for operation in intense radiation and environmental conditions.

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