[16p-D311-1~11] 2.1 Detection Devices

[16p-D311-10] Development of a diamond membrane detector dedicated to linear energy deposition distribution measurement in the clinical carbon beam therapy field

Takumi Matsumoto¹, Yudai Arai^1,2, Shogo Shimizu¹, Kei Kubodera¹, Katsumi Aoki², Hideyuki Takei², Takahiro Makino², Shunsuke Yonai², Takeshi Ohshima², Makoto Sakai³, Akihiko Matsumura³, 〇Wataru Kada¹ (1.Gunma Univ, 2.QST, 3.GHMC)

Keywords:diamond, carbon cancer therapy, linear energy transfer

The use of multiple ions with different Linear Energy transfers (LET) is being considered to be utilized for more advancement of heavy-ion cancer therapy techniques. However, there remains an issue with the applicability of conventional techniques for such irradiation configuration thus, there is a growing demand for energy-discriminative dosimetry. Energy-differentiated dosimeters utilizing Si-SOI semiconductors have been investigated, but their bioequivalence and radiation tolerance remain problems. On the other hand, diamond, a wide bandgap semiconductor, has excellent radiation tolerance and bioequivalence and is therefore considered to be effective in heavy particle radiation fields where various radiation effects are expected. In this study, a thin-film CVD diamond detector was developed, and its fundamental characteristics were evaluated by measuring the LET distribution at various locations of the carbon beam Bragg peaks.