@misc{oai:repo.qst.go.jp:00083569,
 author = {Fumihiko, Nishikido and Eiji, Takada and Yamagishi, Masakazu and Daiki, Satake and Sodai, Takyu and Kang, Hangyu and Taiga, Yamaya and Fumihiko, Nishikido and Eiji, Takada and Daiki, Satake and Sodai, Takyu and Kang, Hangyu and Taiga, Yamaya},
 month = {Oct},
 note = {Organic semiconductors are suitable for dose monitoring in carbon therapy since they are tissue equivalent materials. Here, we have evaluated a 4-hydroxycyanobenzene (4HCB) single crystal as an organic semiconductor radiation detector for carbon therapy. The thickness of the 4HCB crystal can be increased to more than 1 mm easily in order to apply a voltage over 100 V. The 4HCB crystal (4 mm × 4 mm × 2 mm) was mounted on a 10 mm × 10 mm × 1 mm black ABS plate. Readout wires were connected to two sides of the 4HCB crystal with silver paste. The applied voltages to the 4HCB detector were from +10 V to +800 V in the experiment. The experiment was performed in the PH2 course of the Heavy Ion Medical Accelerator in Chiba (HIMAC) at NIRS. The energy and beam intensity of the 12C beam were 290 MeV/u and 1.8 × 109 particles per second (pps). The diameter of the carbon beam was ~1 cm at the detector. The 4HCB detector was irradiated by the carbon beam that was passed through an ionization chamber which was used to normalize the number of irradiated particles. 
We clearly observed collected charges in the 4HCB single crystal obtained during each 0.1 s period of the carbon beam irradiation. The beam spill structure of the 3.3 s cycle was also clearly observed. In addition, we obtained normalized induced charges for the carbon beam irradiation as a function of applied voltages to the 4HCB detector (i.e. saturation curve). The optimum voltage was determined at 500 V for the evaluated 4HCB detector., 2021 Virtual IEEE Nuclear science symposium and medical imaging conference},
 title = {Characterization of a 4-hydroxycyanobenzene radiation detector for dose monitoring in carbon therapy},
 year = {2021}
}