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Development of radiochromic dosimeters based on polymer films with fluoran and divinyl phthalide dyes

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Abstract

We fabricated polyvinyl chloride (PVC) and poly(methyl methacrylate) (PMMA) films containing NIR Black78, Black100 and Black400 for use as dosimeters in radiotherapy, and measured the absorption spectrum of these films before and after X-ray irradiation. Absorption peaks were observed at 456 and 592 nm in the PVC films containing Black400. This result indicates that oxidation reactions of Black400 occurred, suggesting that the radicals generated from PVC by X-ray radiation induced this oxidation. The X-ray sensitivity of the PVC films containing 1.0 wt% Black400 was 28 mm−1 kGy−1, 2.5–70 times higher than that of other polymers containing leuco dyes. The lower limit of detection of 1 mm-thick PVC films containing 1.0 wt% Black400 was 0.17 Gy, rendering them promising for use as dosimeters in radiotherapy.

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Acknowledgements

This research was supported by the Grant-in-Aid for Scientific Research (A) (Nos. 18H03890, 2018–2021; 22H00308, 2022–2025). Part of this research is based on the Cooperative Research Project of the Research Center for Biomedical Engineering, Ministry of Education, Culture, Sports, Science, and Technology.

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Authors and Affiliations

  1. Department of Applied Chemistry, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Toshiya Endo, Yutaka Fujimoto & Keisuke Asai

  2. Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8011, Japan

    Masanori Koshimizu

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  1. Toshiya Endo
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  2. Masanori Koshimizu
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  3. Yutaka Fujimoto
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  4. Keisuke Asai
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Contributions

Writing, preparation of the original draft and investigation were done by TE; conceptualization, methodology validation, formal analysis, writing, reviewing, editing of the manuscript, supervision, project administration and funding acquisition were done by MK; writing, reviewing, editing of the manuscript, supervision and project administration were done by YF; writing, reviewing, editing of the manuscript, supervision and project administration were done by KA; all the authors have read the manuscript and have approved this submission.

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Correspondence to Toshiya Endo.

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Endo, T., Koshimizu, M., Fujimoto, Y. et al. Development of radiochromic dosimeters based on polymer films with fluoran and divinyl phthalide dyes. J Mater Sci: Mater Electron 33, 21472–21481 (2022). https://doi.org/10.1007/s10854-022-08938-8

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