title: Responses of a diamond detector to high-LET charged particles.
abstract: The responses of a commercial diamond detector (type 60003, PTW-Freiburg) to several heavy ions were examined. The responses to heavy-ion beams reached stable levels with relatively small pre-irradiation doses compared to photon-beam irradiations. The responses also reached stable levels with a smaller pre-irradiation dose when the dose rate of the He beams was increased. A total accumulated dose of about 5 Gy was required for the pre-irradiation dose of heavy-ion beams. No angular dependence of the detector responses was observed within a deviation of 5%. The dose-rate dependence of the detector responses to heavy-ion beams was far smaller than that to gamma rays. The decrease in the response was within 0.9%, with a variation from 0.88 to 18.2 Gy min(-1) in the carbon beam. We examined the LET dependence of the diamond detector responses using various kinds of heavy-ion beams. The responses had particle dependence in addition to LET dependence. The responses decreased more with higher LET particles and decreased less with large-Z particles. We proposed a gradual-saturation model based on the track structure under several simple assumptions to explain the LET and particle dependences of the response.
authors.affiliation: Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan. m_sakama@nirs.go.jp
authors.forename: Makoto
authors.initials: M
authors.lastname: Sakama
authors.forename: Tatsuaki
authors.initials: T
authors.lastname: Kanai
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kase
authors.forename: Masataka
authors.initials: M
authors.lastname: Komori
authors.forename: Akifumi
authors.initials: A
authors.lastname: Fukumura
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kohno
mesh_terms: D018130:Diamond / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005720:Gamma Rays; D020450:Heavy Ions; D018499:Linear Energy Transfer; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
chemical_list: D018130:Diamond