AbstractThis work had as its main goal the formulation, characterisation and analysis of a new resin dosimeter (RD). This involved the creation of a new, simplified, formula containing resin precursors and a radiochromic dye (leucomalaquite green). The introduction of nanoparticles into the fabrication process was also explored. The spatial resolution of the RDs was also of special interest.
It was proven experimentally that these RDs are tissue equivalent. Two reading methods were found depending on the dose range: transmission mode for doses above 2 Gy and scatter mode for doses bellow 2 Gy. It was determined that the RDS have a dynamic range from, at least, 0.05 to 23000 Gy. A new fitting procedure was created using a code written in Mathematica™, in order to accommodate the data that was not linear and need to be evaluated with errors in both coordinates. An enhancement in the RDs response was seen in the presence of nanoparticles (gold and hafnium oxide). The spatial resolution was found to be at least 40 µm.
The methodologies presented here were developed in as much detail as possible so that they can be followed by radiotherapy facilities staff as well as scientists in radiation facilities in order to make, use and analyse these new simplified resin dosimeters.
|Date of Award||Jul 2020|
|Supervisor||Fred Currell (Supervisor) & Jason Greenwood (Supervisor)|
Tissue-equivalent and nanoparticle doped resin dosimeters
Figueira, C. (Author). Jul 2020
Student thesis: Doctoral Thesis › Doctor of Philosophy