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Challenges of dosimetry of ultra-short pulsed very high energy electron beams

DOI: 10.1016/j.ejmp.2017.04.029 DOI Help

Authors: Anna Subiel (National Physical Laboratory) , Vadim Moskvin (St. Jude Children's Research Hospital) , Gregor H. Welsh (University of Strathclyde) , Silvia Cipiccia (Diamond Light Source; University of Strathclyde) , David Reboredo (University of Strathclyde) , Colleen Desrosiers (Indiana University School of Medicine) , Dino A. Jaroszynski (University of Strathclyde)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physica Medica

State: Published (Approved)
Published: May 2017

Open Access Open Access

Abstract: Very high energy electrons (VHEE) in the range from 100 to 250 MeV have the potential of becoming an alternative modality in radiotherapy because of their improved dosimetric properties compared with 6–20 MV photons generated by clinical linear accelerators (LINACs). VHEE beams have characteristics unlike any other beams currently used for radiotherapy: femtosecond to picosecond duration electron bunches, which leads to very high dose per pulse, and energies that exceed that currently used in clinical applications. Dosimetry with conventional online detectors, such as ionization chambers or diodes, is a challenge due to non-negligible ion recombination effects taking place in the sensitive volumes of these detectors. FLUKA and Geant4 Monet Carlo (MC) codes have been employed to study the temporal and spectral evolution of ultrashort VHEE beams in a water phantom. These results are complemented by ion recombination measurements employing an IBA CC04 ionization chamber for a 165 MeV VHEE beam. For comparison, ion recombination has also been measured using the same chamber with a conventional 20 MeV electron beam. This work demonstrates that the IBA CC04 ionization chamber exhibits significant ion recombination and is therefore not suitable for dosimetry of ultrashort pulsed VHEE beams applying conventional correction factors. Further study is required to investigate the applicability of ion chambers in VHEE dosimetry.

Journal Keywords: Very high energy electrons (VHEE); Monte Carlo; Ultrashort pulses; Ion recombination; Small fields dosimetry; Pulsed beam dosimetry

Subject Areas: Physics, Medicine

Technical Areas:

Added On: 17/05/2017 10:01


Discipline Tags:

Physics High energy & particle physics

Technical Tags: