Publication

Achieving Sub-20 ps Resolution in Large Arrays of μSiPMs for the DIGILOG Project

Claudio Bruschini
2025

Abstract

In time-of-flight PET, coincidence time resolution (CTR) of gamma ray detection is essential, with the recent aim of reaching better than 10 ps CTR [1]. Prompt photon emission, e.g. Cherenkov radiation in BGO crystals, has been heralded as a solution to this conundrum. However, Cherenkov detection has low photon yield, prompting high photon detection efficiency and low dark count rate, while achieving fast response with high single-photon time resolution (SPTR) in detectors [2].

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Claudio Bruschini
2025

Abstract

Official source

Related concepts (27)

Scintillator

A scintillator ('sɪntɪleɪtər ) is a material that exhibits scintillation, the property of luminescence, when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate (i.e. re-emit the absorbed energy in the form of light). Sometimes, the excited state is metastable, so the relaxation back down from the excited state to lower states is delayed (necessitating anywhere from a few nanoseconds to hours depending on the material).

Gamma spectroscopy

Gamma-ray spectroscopy is the qualitative study of the energy spectra of gamma-ray sources, such as in the nuclear industry, geochemical investigation, and astrophysics. Gamma-ray spectrometry, on the other hand, is the method used to acquire a quantitative spectrum measurement. Most radioactive sources produce gamma rays, which are of various energies and intensities. When these emissions are detected and analyzed with a spectroscopy system, a gamma-ray energy spectrum can be produced.

Cherenkov radiation

Cherenkov radiation (tʃəˈrɛŋkɒf; Эффект Вавилова–Черенкова) is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity (speed of propagation of a wavefront in a medium) of light in that medium. A classic example of Cherenkov radiation is the characteristic blue glow of an underwater nuclear reactor. Its cause is similar to the cause of a sonic boom, the sharp sound heard when faster-than-sound movement occurs.

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Achieving Sub-20 ps Resolution in Large Arrays of μSiPMs for the DIGILOG Project

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