| Title: |
Response modelling of a-Si:H detector read by TetrAMM picoammeter exposed to a clinical electron beam |
| Authors: |
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. |
| Source: |
Journal of Instrumentation ; volume 21, issue 03, page C03005 ; ISSN 1748-0221 |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2026 |
| Description: |
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 10 MeV 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 (100 kHz sampling frequency), resolves individual radiation pulses with high repeatability. Both pulse charge and peak current scale linearly with the applied electric field up to 6 V (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. |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| DOI: |
10.1088/1748-0221/21/03/c03005 |
| DOI: |
10.1088/1748-0221/21/03/C03005 |
| DOI: |
10.1088/1748-0221/21/03/C03005/pdf |
| Availability: |
https://doi.org/10.1088/1748-0221/21/03/c03005; https://iopscience.iop.org/article/10.1088/1748-0221/21/03/C03005; https://iopscience.iop.org/article/10.1088/1748-0221/21/03/C03005/pdf |
| Rights: |
http://creativecommons.org/licenses/by/4.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining |
| Accession Number: |
edsbas.90AA3F5D |
| Database: |
BASE |