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http://hdl.handle.net/11375/24092
Title: | THE DEVELOPMENT OF A LOW DENSITY RADIOCHROMIC GEL DOSIMETER |
Authors: | Al Rashed, Hailah |
Advisor: | Diamond, Kevin |
Department: | Radiation Sciences (Medical Physics/Radiation Biology) |
Keywords: | Gel Dosimetry, Radiation Dosimetry, Radiochromic Dosimeter, Radiotherapy, Quality Assurance (QA), Gelatin, Two dimensional, Three dimensional |
Publication Date: | 2019 |
Abstract: | This research aims to develop a tissue-mimicking material and produce a 3D gelatin that has density of approximately a human lung, which is in the ranges of (0.25 – 0.35) g/cm3. Tissue equivalent models are important in order to study the radiation dose planned for patients. To achieve the desired density of a human tissue, different types of gelatin were whisked for 300 seconds using a typical hand mixer. The mechanical properties of the gelatin mixtures, standard and foamed, were evaluated by applying different forces. The mechanical properties for the gels were measured using an indentation technique, which showed that the gels act as elastic materials. The mechanical properties of the foams were also evaluated. Mixtures that contained 300 bloom gelatin, glycerol, and sorbitol, were whisked for 60, 180, 300 seconds to achieve different densities evaluated by CT imaging. The density of the180 - and 300 - seconds gelatin foams were found to be 0.33 ± 0.16 and 0.33 0.052 g/cm3, respectively, which is similar to the human lung density. Finally, FXO gel sheets and the FXO foam sheets were irradiated and the radiosensitivity quantified by measuring transmission using a spectrometer. The change in the attenuation coefficient was linear with dose. |
URI: | http://hdl.handle.net/11375/24092 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Rashed_Hailah_Ab_2018December_Master degree.pdf | 2.82 MB | Adobe PDF | View/Open |
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