[12a-M103-1~11] 2.2 Detection systems

[12a-M103-2] Development of Silicon-carbide based radiation detector for the dosimetry at carbon therapy facility

〇Wataru Kada¹, Yuya Ohki^1,2, Kohei Osaki³, Yuichi Yamazaki², Takahiro Makino², Takeshi Ohshima², Akihiko Matsumura³, Makoto Sakai³, Osamu Hanaizumi¹ (1.Gunma Univ., 2.QST, 3.GHMC)

Keywords:carbon beam, SiC, dosimetry

It is an urgent matter to develop highly precise quality control and quality assurance methods that can covers various line energy transfer (LET) distributions, as radiotherapy such as quantum scalpel or multi-ion irradiation techniques progresses. For such purpose, silicon is reliable semiconductor in many aspects, however, its radiation tolerance and nonlinear response for tissue equivalence is often under discussion. Corresponding to this subject, we have selected 4H SiC Schottky Barrier Diode detector as a futuristic candidate of such dosimetr of clinical carbon beam. The spectra of carbon and its fragments was measured utilizing 4H SiC detector at each point of the Bragg curve, which was preliminary evaluated by the conventional ionization chamber. From the experimental results it was confirmed that LET distribution was shifted toward the high LET side from the plateau region to the Bragg peak region. From this result, it was confirmed that SiC charged particle beam detector can be applied to heavy particle beam measurement.