Pierre Gérard Ortega

PhD Candidate
Interuniversity Institute for High Energies (IIHE)
Université libre de Bruxelles, Brussels, Belgium
pierre.gerard.ortega@ulb.be

Research

I work on dosimetry for FLASH radiotherapy. At ultra-high dose rates (UHDR), ion recombination and space-charge effects degrade the response of ionization chambers, making standard correction methods unreliable.

My PhD project has two parts. The first, GarFLIC, extends the Garfield++ Monte Carlo framework to simulate the charge collection efficiency of plane-parallel ionization chambers under UHDR proton beams. The second builds on these models to develop an FPGA-based system that corrects the measured dose in real time.

Supervisor: Prof. Gilles De Lentdecker
Funding: PIT ProtherWal, No. 7289 (Walloon Region)

Publications

  1. 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 Preprint
    Pierre Gérard Ortega, Gilles De Lentdecker, Quentin Flandroy, Jarrick Nys
    arXiv:2606.24384 [physics.med-ph] ·
    arXiv
  2. 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 ·
    DOI

Software

Conferences

Teaching, Service & Outreach

Education