title: Measurement of X-ray spectra using a Lu2(SiO4)O-multipixel-photon detector with changes in the pixel number.
abstract: To measure X-ray spectra with high count rates, we developed a detector consisting of a Lu2(SiO4)O [LSO] crystal with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrents flowing through the MPPC are converted into voltages and amplified by a high-speed current-voltage amplifier, and event pulses from the amplifier are sent to a multichannel analyzer to measure spectra. We used three MPPCs of 100, 400 and 1600 pixels/mm(2), and the MPPCs were driven under pre-Geiger mode at a temperature of 20 °C. At a tube voltage of 100 kV and a tube current of 5.0 μA, the maximum count rate was 12.8 kilo-counts per second. The event-pulse widths were 200 ns, and the energy resolution was 53% at 59.5 keV using a 100-pixel MPPC.
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan. Electronic address: dresato@iwate-med.ac.jp.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamaguchi
authors.affiliation: Department of Physics, Iwate Medical University, 2-1-1 Nishitokuta, Yahaba, Iwate 028-3694, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Sato
authors.affiliation: Department of Physics, Iwate Medical University, 2-1-1 Nishitokuta, Yahaba, Iwate 028-3694, Japan.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Oda
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan.
authors.forename: Ryuji
authors.initials: R
authors.lastname: Nakamura
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan.
authors.forename: Hirobumi
authors.initials: H
authors.lastname: Oikawa
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Yabuushi
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan.
authors.forename: Hisanori
authors.initials: H
authors.lastname: Ariga
authors.affiliation: Department of Radiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, Iwate 020-0023, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ehara
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008187:Lutetium / Q000528:radiation effects*; D010783:Photometry / Q000295:instrumentation*; D017785:Photons; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012822:Silicon Dioxide / Q000528:radiation effects; D014159:Transducers; D014965:X-Rays
chemical_list: D008187:Lutetium; D012822:Silicon Dioxide
keywords: 200-ns-width event pulse; Energy resolution; High-speed amplifier; LSO-MPPC detector; Pre-Geiger mode; X-ray spectra