Measurement of the radiation dose and radiation isocenter of the TrueBeam accelerator using 3D polymer gel dosimeters from the VIPAR family with different chemical history
Marek Kozicki, Malwina Jaszczak, Piotr Maras, Sławomir Kadłubowski
Abstract
This work describes the measurements of the ionizing radiation dose and the determination of the radiation isocenter using a tool consisting of three-dimensional polymer gel dosimeters and a dedicated software package. Specific polymer gel dosimeters were selected. Their inherent common feature is the possibility of high-resolution three-dimensional measurement of dose distribution in radiotherapy and the presence of the N-vinylpyrrolidone monomer in the composition alongside other substances such as the cross-linking agent N,N'-methylenebisacrylamide, oxygen scavengers, stabilizers and gel matrix. The aim of this study was to analyze the influence of the chemical history of N-vinylpyrrolidone (purity and aging) on the dose response of some dosimeters. In addition, this work seeks to answer the question of how important purity and aging of N-vinylpyrrolidone are in dosimetry applications, such as routine testing of medical accelerators.