A5051078337- Radiation Therapy and Dosimetry
- Advanced Radiotherapy Techniques
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Radiation Effects and Dosimetry
- Pulsed Power Technology Applications
- Radiation Effects in Electronics
- Electrostatic Discharge in Electronics
- Luminescence Properties of Advanced Materials
- Catalytic Processes in Materials Science
- Microwave Engineering and Waveguides
- Laser-Matter Interactions and Applications
- Aerogels and thermal insulation
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
McGill University
2017-2025
McGill University Health Centre
2020-2025
Proton therapy presents an interesting and important challenge to accelerator physics. Practical restrictions such as room size, gantry weight, cost have led a demand for more compact affordable devices. Success would benefit significant number of patients every year. Dielectric wall accelerators could provide this breakthrough, but there is limited work available regarding their feasibility or possible integration into medical devices, no solutions exist longitudinal beam control. In work,...
Purpose In this work, the design, operation, initial experimental evaluation, and characterization of a small‐scale graphite calorimeter probe — herein referred to as Aerrow developed for routine use in clinical environment, are described. Similar size shape Farmer type cylindrical ionization chamber, represents first translation calorimetry intended direct by physicists radiotherapy clinic. Methods Based on numerically optimized design obtained previous functioning prototype capable two...
Purpose With the introduction of a novel graphite probe calorimeter, called Aerrow, various thermal insulating materials are being explored to further improve device. Silica‐based aerogels proving be an optimal material due their low densities, small conductivities, rigidity, and machinability. The aim this work is determine how silica aerogel densities affect Aerrow’s performance. Methods Performance concerns three areas: heat transfer from core, beam quality dependence, effects applied...
Purpose In this work, the fabrication, operation, and evaluation of a probe‐format graphite calorimeter — herein referred to as Aerrow an absolute clinical dosimeter high‐energy photon beams while in presence B = 1.5 T magnetic field is described. Comparable cylindrical ionization chamber (IC) terms utility usability, has been developed for purpose accurately measuring absorbed dose water clinic with minimum disruption existing workflow. To our knowledge, first reported application...
The in-phantom calibration method for radiotherapy kilovoltage x-ray beams requires ionization chamber correction factors. overall factor accounts changes in the response due to displacement of water by cavity and wall, presence stem change incident photon energy angular distribution phantom that air. A waterproof sheath, if required, is accounted a sheath factor. aim this study determine factors through Monte Carlo (MC) simulations calorimetry measurements. Correction are determined PTW...
Abstract Background The conventional theories and methods of determining the ion recombination correction factor, such as Boag theory related two voltage method Jaffé plot extrapolation, do not seem to yield accurate results in FLASH /high dose per pulse (DPP) beams (10 mGy DPP). This is due presence a large free electron fraction that distorts electric field inside chamber sensitive volume. To understand influence these effects on factor develop new expressions for it, it necessary re‐visit...
Abstract Purpose To characterize and build a cylindrically layered graphite calorimeter the size of thimble ionization chamber for absolute dosimetry small fields. This detector has been designed in familiar probe format to facilitate integration into clinical workflow. The feasibility operating this absorbed dose quasi‐adiabatic mode is assessed high‐energy accelerator‐based photon beams. Methods detector, herein referred as Aerrow MK7, miniaturized version previously validated...