title: Radiochromic film dosimetry of HDR (192)Ir source radiation fields.
abstract: OBJECTIVE
  A radiochromic film based dosimetry system for high dose rate (HDR) Iridium-192 brachytherapy source was described. A comparison between calibration curves established in water and Solid Water™ was provided.
  
  
  METHODS
  Pieces of EBT-2 model GAFCHROMIC™ film were irradiated in both water and Solid Water™ with HDR (192)Ir brachytherapy source in a dose range from 0 to 50 Gy. Responses of EBT-2 GAFCHROMIC™ film were compared for irradiations in water and Solid Water™ by scaling the dose between media through Monte Carlo calculated conversion factor for both setups. To decrease uncertainty in dose delivery due to positioning of the film piece with respect to the radiation source, traceable calibration irradiations were performed in a parallel-opposed beam setup.
  
  
  RESULTS
  The EBT-2 GAFCHROMIC™ film based dosimetry system described in this work can provide an overall one-sigma dose uncertainty of 4.12% for doses above 1 Gy. The ratio of dose delivered to the sensitive layer of the film in water to the dose delivered to the sensitive layer of the film in Solid Water™ was calculated using Monte Carlo simulations to be 0.9941 ± 0.0007.
  
  
  CONCLUSIONS
  A radiochromic film based dosimetry system using only the green color channel of a flatbed document scanner showed superior precision if used alone in a dose range that extends up to 50 Gy, which greatly decreases the complexity of work. In addition, Solid Water™ material was shown to be a viable alternative to water in performing radiochromic film based dosimetry with HDR (192)Ir brachytherapy sources.
authors: McGill University, Department of Radiation Oncology, Montréal, Québec, Canada. SIDuluijan@sfda.gov.sa
authors: Saad
authors: S
authors: Aldelaijan
authors: Huriyyah
authors: H
authors: Mohammed
authors: Nada
authors: N
authors: Tomic
authors: Li-Heng
authors: LH
authors: Liang
authors: Francois
authors: F
authors: Deblois
authors: Arman
authors: A
authors: Sarfehnia
authors: Wamied
authors: W
authors: Abdel-Rahman
authors: Jan
authors: J
authors: Seuntjens
authors: Slobodan
authors: S
authors: Devic
mesh_terms: D005373:Film Dosimetry / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007496:Iridium Radioisotopes / Q000627:therapeutic use*; D019047:Phantoms, Imaging; D011878:Radiotherapy / Q000379:methods*; D035501:Uncertainty
chemical_list: D007496:Iridium Radioisotopes