Abstract
The high spatial resolution of radiochromic film makes it ideal for dosimetric measurements and dose distributions in regions of high dose gradient. Intensity‐modulated radiation therapy, intravascular brachytherapy, and eye‐plaque radiation therapy demand precise spatial dosimetric calculations. Such precision is not possible with conventional dosimeters, such as thermoluminescent dosimeters and ionization chambers. Recently, new GAFCHROMIC® XR type T and type R films have been developed for radiation dosimetry, specifically in interventional radiology procedures. Dosimetric characteristics (i.e., linearity, post‐exposure density growth, energy dependence, dose‐rate dependence, and UV light sensitivity) of these new films were investigated. To evaluate the clinical applications of these films, their characteristics were compared with other commercially available film models. GAFCHROMIC® XR type T and type R films were found to be more sensitive to low‐energy doses as compared with GAFCHROMIC® MD‐55 films.PACS numbers: 87.66‐a, 87.53‐j
Highlights
Dosimeters with high spatial resolution are desirable for measurement and quality control of radiation in high-dose gradient areas
The color of XR type R film turns from amber to dark greenish-black, and XR type T films turn from orange to brownish-black, depending on the level of exposure
The dosimetric characteristics of the GAFCHROMIC® XR type T and type R films were experimentally determined in air and Solid WaterTM phantom material, and the results are discussed below
Summary
Dosimeters with high spatial resolution are desirable for measurement and quality control of radiation in high-dose gradient areas. These detectors could provide accurate dose distribution in the close vicinity of brachytherapy sources. The quality assurance of the intensity-modulated radiation therapy technique could benefit from these types of detectors.[4,5,6,7] Conventional measuring systems such as thermoluminescent dosimeters, ionization chambers, and semiconductors are not capable of such spatial resolution. The organicbased radiochromic film dosimeters offer superior tissue-equivalent properties and high spatial resolution that could fulfill the dosimetric requirements of the latest advancements in the field of radiation therapy
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