Evaluation of ion recombination correction for indigenously developed farmer ion chamber in flattening filter-free photon beams
- 1. School of Physical Sciences, Swami Ramanand Tirth Marathwada University, Nanded, Maharashtra (India)
- 2. Department of Radiation Oncology, P.D. Hinduja Hospital and Medical Research Centre, Mumbai (India)
- 3. Department of Physics, Shri Datta Arts, Commerce and Science College, Hadgaon, Maharashtra (India)
Description
Modern generation linear accelerator (linac) either generates X-rays with a flattening filter (WFF beam) or without flattening filter free (FFF beam). The FFF beams are associated with a significantly higher dose per pulse compared to WFF beams due to the absence of a flattening filter and the corresponding attenuation caused by it. This results in increased ion recombination and a larger saturation correction factor (ks). In accordance with the IAEA TRS 398 dosimetry protocol, ks is necessary for the accurate measurement of absorbed dose at a point in water. The objective of this study was to evaluate the ks for the indigenous FAR 65-GB ion chamber (IC) for the FFF X-rays.Our study reveals that this chamber is suitable for the reference dosimetry for the FFF beams
Additional details
Identifiers
Publishing Information
- Journal Title
- Journal of Medical Physics
- Journal Volume
- 49
- Journal Issue
- 2
- Journal Page Range
- p. 279-284
- CODEN
- JMPHFE
INIS
- Country of Publication
- India
- Country of Input or Organization
- India
- INIS RN
- 55072742
- Subject category
- S43: PARTICLE ACCELERATORS;
- Descriptors DEI
- ABSORBED DOSE RANGE; DOSIMETRY; IAEA; IONIZATION CHAMBERS; LINEAR ACCELERATORS; PHOTON BEAMS; RADIOTHERAPY
- Descriptors DEC
- ACCELERATORS; BEAMS; INTERNATIONAL ORGANIZATIONS; MEASURING INSTRUMENTS; MEDICINE; NUCLEAR MEDICINE; RADIATION DETECTORS; RADIATION DOSE RANGES; RADIOLOGY; THERAPY