Dosimetric impact of iodine content in a polyvinyl alcohol-iodide radiochromic gel dosimeter
| Autor: | Keisuke Fujino, Yukio Akagi, Shin-ichiro Hayashi, Yutaka Hirokawa, Kaoru Ono |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Radiation Materials science Dosimeter Radiochemistry Iodide chemistry.chemical_element Repeatability Gel dosimetry Iodine 01 natural sciences Polyvinyl alcohol 030218 nuclear medicine & medical imaging 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry 0103 physical sciences Instrumentation Percentage depth dose |
| Zdroj: | Radiation Measurements. 135:106340 |
| ISSN: | 1350-4487 |
| DOI: | 10.1016/j.radmeas.2020.106340 |
| Popis: | Recently, we developed a radiochromic gel dosimeter based on a polyvinyl alcohol-iodide (PVA-I) complexes that can be reused after annealing. Although, the dosimeter is composed of water mostly, iodine was partially added. In the present study, the dosimeteric impact of iodine content in a PVA-I gel dosimeter was investigated through percentage depth dose (PDD) measurements using a flatbed scanner and Monte Carlo (MC) simulations. In addition, the PDD measurement was repeated 5 times by means of repeated annealing to evaluate repeatability of the dosimeter. In the gel dosimetry study, a good agreement was observed between the PDDs measured with the gel dosimeters with various iodine content, which were read out using a flatbed scanner, and the PDDs calculated with MC simulations in the dosimeters. Furthermore, a good repeatability of PDD(10) at 10 cm depth obtained from the repeated PDD measurements with the gel dosimeters was observed with less than 1% of standard deviation regardless of the iodine content. In the MC simulations, a good agreement was observed between the calculated PDDs in the gel dosimeters and the calculated PDDs in water. The photon fluence was significantly decreased as the iodine content was increased in the low-energy region unlike with the high-energy region. These results enabled us to conclude that the dose response with iodine content can be ignored in high-energy X-rays used in the field of radiotherapy. However, it might not be ignored in low-energy X-rays. Therefore, a small iodine content might be desirable for water-equivalent gel dosimeters. |
| Databáze: | OpenAIRE |
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