Presentation Information
[25p-12E-1]Evaluation of clinical dose distribution in heavy ion cancer therapy field by using a diamond membrane detector
〇Wataru Kada1, Takumi Matsumoto2, Katsumi Aoki3, Tsubasa Oguro2, Yuki Otsuka2, Hideyuki Takei3, Christina Weiss4,5, Erich Griesmayer4,5, Shunsuke Yonai3, Takahiro Makino3, Takeshi Ohshima3, Makoto Sakai6, Akihiko Matsumura6 (1.Tohoku Univ., 2.Gunma Univ., 3.QST, 4.CIVIDEC, 5.TU Wien, 6.GHMC)
Keywords:
diamond,clinical dosimeter,radiation induced current
Cancer therapy with particle beams has a technological advantage due to the high linear energy transfer (LET) of particle beams. The technology progresses further by utilizing multiple ion species to initiate the treatment with different treatment outcomes. It initiates an increasing need to develop new dosimetry techniques which utilize energy-dispersive detectors and deliver the radiation effects with a complex distribution of biological effects by delivering relative biological effectiveness (RBE) distributions. The demand for new dosimetry techniques is on the increase. Energy-dispersive dosimeters based on Si-SOI semiconductors have been investigated, but their bioequivalence and radiation tolerance are still issues to be addressed. To address this issue, we proposed a dosimeter using wide bandgap semiconductor with excellent radiation tolerance. Here we propose a diamond-based dosimeter, which may be an ideal material for this application as it is closer to the biological response in terms of inhibition ratio compared to SiC, which was considered in previous work. In this study, we analyzed the output of thin film diamond detectors formed by CVD in a carbon beam field and evaluated the clinical dose distribution incorporating biological effects from the output obtained from the response.