The INFN HASPIDE project investigates hydrogenated amorphous silicon (a-Si:H) as an innovative detector technology for dosimetry in FLASH radiotherapy. Conventional dosimeters, such as ionization chambers, show non-linear behavior when exposed to ultra-high dose-per-pulse beams used in FLASH radiotherapy, where several Grays are delivered in microsecond pulses. Thanks to its radiation hardness, mechanical flexibility and compatibility with large-area deposition, a-Si:H is a promising material for in-vivo and surface dosimetry. This work presents the response of a thin a-Si:H detector exposed to a high-dose-per-pulse 10MeV electron beam, together with an analytical model used to describe the single-pulse dynamics and extract quantitative parameters. Measurements were performed at the University of Torino using a modified clinical LINAC operated in Ultra High Dose Rate regime, where the single-pulses satisfy the FLASH criteria. The a-Si:H detector, read out with a TetrAMM picoammeter (100kHz sampling frequency), resolves individual radiation pulses with high repeatability. Both pulse charge and peak current scale linearly with the applied electric field up to 6V (2.4 V/μm), beyond which the readout electronics saturates. The analytical model is validated through direct comparison with raw data, showing excellent agreement in extracted pulse parameters.
Response modelling of a-Si:H detector read by TetrAMM picoammeter exposed to a clinical electron beam / Cittadini, F.; Kanxheri, K.; Ponzecchi, M.; Talamonti, C.; Menichelli, M.; Sacchi, R.; Giordanengo, S.; Vignati, A.; Deut, U.; Olivares, D.M.; Aziz, S.; Barraud, L.; Bashiri, A.; Buti, C.; Calcagnile, L.; Calvo, D.; Caputo, D.; Caricato, A.P.; Catalano, R.; Cazzanelli, M.; de Cesare, G.; Cirio, R.; Cirrone, G.A.P.; Croci, T.; Cuttone, G.; Dunand, S.; Fabi, M.; Frontini, L.; Grimani, C.; Guarrera, M.; Hasnaoui, H.; Insero, G.; Ionica, M.; Konstantinou, G.; Lenta, F.; Liberali, V.; Lovecchio, N.; Martino, M.; Maruccio, G.; Mazza, G.; Monteduro, A.G.; Morozzi, A.; Nascetti, A.; Pallotta, S.; Passeri, D.; Pedio, M.; Petasecca, M.; Petringa, G.; Peverini, F.; Placidi, P.; Polo, M.; Quaranta, A.; Quarta, G.; De Remigis, P.; Rizzato, S.; Sabbatini, F.; Sandhu, R.; Stabile, A.; Tosti, L.; Vasquez, M.M.S.; Verdini, A.; Villani, M.; Wheadon, R.J.; Wyrsch, N.; Servoli, L.. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - ELETTRONICO. - 21:(2026), pp. 0-0. [10.1088/1748-0221/21/03/c03005]
Response modelling of a-Si:H detector read by TetrAMM picoammeter exposed to a clinical electron beam
Ponzecchi, M.;Talamonti, C.;Insero, G.;Pallotta, S.;
2026
Abstract
The INFN HASPIDE project investigates hydrogenated amorphous silicon (a-Si:H) as an innovative detector technology for dosimetry in FLASH radiotherapy. Conventional dosimeters, such as ionization chambers, show non-linear behavior when exposed to ultra-high dose-per-pulse beams used in FLASH radiotherapy, where several Grays are delivered in microsecond pulses. Thanks to its radiation hardness, mechanical flexibility and compatibility with large-area deposition, a-Si:H is a promising material for in-vivo and surface dosimetry. This work presents the response of a thin a-Si:H detector exposed to a high-dose-per-pulse 10MeV electron beam, together with an analytical model used to describe the single-pulse dynamics and extract quantitative parameters. Measurements were performed at the University of Torino using a modified clinical LINAC operated in Ultra High Dose Rate regime, where the single-pulses satisfy the FLASH criteria. The a-Si:H detector, read out with a TetrAMM picoammeter (100kHz sampling frequency), resolves individual radiation pulses with high repeatability. Both pulse charge and peak current scale linearly with the applied electric field up to 6V (2.4 V/μm), beyond which the readout electronics saturates. The analytical model is validated through direct comparison with raw data, showing excellent agreement in extracted pulse parameters.
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