My research focuses on detector physics for medical applications, with an emphasis on
dosimetry in advanced radiation therapy. I study charge transport and recombination
processes in ionization chambers, combining theoretical models with numerical simulations
to better understand detector response under challenging irradiation conditions. My
interests include proton therapy and ultra-high dose rate (UHDR) regimes, where
conventional dosimetric approaches face important limitations. Through this work, I aim
to contribute to the development of more accurate and reliable detectors for
next-generation radiotherapy.
Charge Collection Efficiency in Air-Vented Plane-Parallel Ionisation Chambers at Ultra-High Dose Rates: A Self-Consistent Garfield++ Monte Carlo Model Including Space-Charge Effects and Ion Recombination
Pierre Gérard Ortega, Gilles De Lentdecker, Quentin Flandroy, Jarrick Nys
e-print, June 2026
Collection Efficiency of Large-Surface Plane-Parallel Ionization Chamber Used for Dose Monitoring in FLASH Non-Uniform Pulsed Proton Beam
Indrani Jayam, Gilles De Lentdecker, Quentin Flandroy, Nicolas Gérard, Pierre Gérard Ortega, Jarrick Nys
International Journal of Particle Therapy, June 2024
"Study of the charge collection efficiency in air vented ionization chambers in UHDR proton beams"
FLASH Radiotherapy and Particle Therapy Conference (FRPT) 2025
Poster · Prague, Czech Republic · December 2025
FLASH Radiotherapy and Particle Therapy Conference (FRPT) 2024
Poster · Rome, Italy · December 2024
DRD1 - Gaseous Detectors Simulation School (CERN)
Invited tutor at the international Gaseous Detector Simulation School (GDSimS), providing hands-on training in Garfield++ and detector simulations
Bari, Italy · May 2026
Scientific Proofreading – Le mystère de l'univers
Scientific review of the French translation of the children's science book by
Jan Paul Schutten (translated by Maurice Lomré, published by
L'École des loisirs)
2021