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Development of Oxide-Based Lead (II) Iodide Radiotherapeutic Dosimeter for Stable Dosimetry

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As the use of high-energy radiation therapy devices has increased in the medical field, routine quality assurance and continuous quality-process improvement are necessary to ensure accurate measurement of radiation doses. Gas-filled ionization chambers and semiconducting silicon (Si) diodes, which are commonly used to detect high-energy radiation therapeutic doses through ionization reaction mechanisms, exhibit limited continuous-dose detection because of the large ionization-chamber size and high work function, which slow the electron–hole pairs. In this study, we aim to develop a dosimeter with improved ability to stably and continuously detect radiation doses. A high-energy radiation dosimeter was developed using a mixture of lead (II) iodide (PbI2) with SiO2 and TiO2, and its reproducibility, linearity, and sensitivity were assessed. The oxide-mixing ratio was found to be important for improving the stability and reproducibility. Our experiment indicated that the dosimeter reproducibility increased by 10%. The best reproducibility was observed with a TiO2 mass fraction of 5%. We also assessed the linearity of the dosimeter and found an R 2 value greater than 0.99, indicating excellent linearity. Our oxide-based PbI2 dosimeters satisfied all response properties for dose detection.
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Keywords: DOSIMETER; OXIDE MIXING RATIO; QUALITY ASSURANCE; RADIATION DOSE

Document Type: Research Article

Publication date: July 1, 2018

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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