Fully-digital 3D imager for gamma and hard-X rays - 20227N9LW7

PRIN 2022 – Finanziato dall’Unione europea NextGenerationEU

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This project aims at developing single photon detectors for hard X-rays with 3D resolution (x-y-time). We will exploit Separate Absorption and Multiplication regions Avalanche PhotoDiode (SAP-APD) based on III-V semiconductors. These materials feature a higher atomic number and thus are more efficient than silicon in absorbing hard X-rays. Furthermore, their higher carrier mobility results in higher speed. Spatial resolution will be attained by capacitive coupling of a large area pixel (some millimeters of diameter) to two cross delay lines connected to high-precision four-channel Time-To-Digital-Converters (TDCs), resulting in a 3D fully-digital time-based detection system with a target of less than 100 um of spatial resolution and 10 ps of time resolution. For gamma-ray detection, the same bundle can be reused gluing a matrix of scintillator crystals over the SAP-APD.


  • Politecnico di Milano
  • Università degli Studi di Udine
  • Consiglio Nazionale delle Ricerche
  • Università degli Studi di Trieste
  • Istituto Nazionale di Fisica Nucleare sezione di Trieste

Importo del progetto

Importo totale dell’intero progetto   Euro 279.926,00
Importo del progetto Uniud             Euro 33.877,00
Contributo MUR Uniud                   Euro 12.704,00
Cofinanziamento Uniud                  Euro 21.173,00


  • Data avvio progetto 28 settembre 2023
  • Data conclusione progetto 27 settembre 2025