Naoaki Shimura
Hitachi
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Publication
Featured researches published by Naoaki Shimura.
ieee nuclear science symposium | 2006
M. Moszynski; A. Nassalski; W. Czarnacki; A. Syntfeld-Kazuch; D. Wolski; T. Batsch; Tatsuya Usui; Shigenori Shimizu; Naoaki Shimura; Kazuhisa Kurashige; K. Kurata; Hiroyuki Ishibashi
Several LGSO samples with different Ce doping were studied in comparison to GSO crystal. The light output, non-proportionality of the light response, energy resolution and intrinsic resolution were measured and compared to the intensity of the afterglow recorded in the second range of time. A high light output of 17000plusmn1700 ph/MeV and a good energy resolution of 6.5plusmn0.2% for 662 keV gamma rays from a Cs source were obtained for the best sample, doped with 1 mol% of Ce. The energy resolution and, in particularly the intrinsic resolution varied with the concentration of Ce in the tested crystals and were not correlated with their common non-proportionality characteristics. In contrast, the observed correlation of the intrinsic energy resolution of the LGSO crystals and the intensity of their afterglow indicates that the energy resolution of scintillation detectors may be affected by a strong afterglow of the crystals. Thus, it suggests to the manufacturers to make more efforts to reduce afterglow in the crystals.
IEEE Transactions on Nuclear Science | 2006
Shigenori Shimizu; Kazuhisa Kurashige; Tatsuya Usui; Naoaki Shimura; K. Sumiya; N. Senguttuvan; A. Gunji; M. Kamada; Hiroyuki Ishibashi
We have developed Lu
ieee nuclear science symposium | 2007
Claude Pépin; St-Pierre C; J.-C. Forgues; Yasushi Kurata; Naoaki Shimura; Tatsuya Usui; T. Takeyama; Hiroyuki Ishibashi; Roger Lecomte
_0.4
IEEE Transactions on Nuclear Science | 2006
Naoaki Shimura; M. Kamada; A. Gunji; S. Yamana; Tatsuya Usui; Kazuhisa Kurashige; Hiroyuki Ishibashi; N. Senguttuvan; Shigenori Shimizu; K. Sumiya; Hideo Murayama
Gd
ieee nuclear science symposium | 2003
Kazuhisa Kurashige; A. Gunji; M. Kamada; Naoaki Shimura; Hiroyuki Ishibashi; K. Yoshida; N. Senguttuvan; K. Sumiya; Shigenori Shimizu; Hideo Murayama
_1.6
ieee nuclear science symposium | 2005
Tatsuya Usui; Shigenori Shimizu; Naoaki Shimura; Kazuhisa Kurashige; Y. Kurata; K. Sumiya; N. Senguttuvan; A. Gunji; M. Kamada; Hiroyuki Ishibashi
SiO
Filtration & Separation | 2004
Naoaki Shimura; M. Kamada; A. Gunji; S. Yamana; T. Usui; K. Kurashige; H. Ishibashi; N. Senguttuvan; S. Shimizu; K. Sumiya; Hideo Murayama
_5
IEEE Transactions on Nuclear Science | 2006
Shigenori Shimizu; H. Murakami; T. Koizumi; Tatsuya Usui; Naoaki Shimura; Kazuhisa Kurashige; Y. Kurata; N. Senguttuvan; K. Sumiya; Hiroyuki Ishibashi
:Ce (LGSO) crystals as a new scintillator for medical applications. Scintillation properties of LGSO crystal of various Ce concentrations and their dependence on annealing effect were studied. Its absorption coefficient at 511 KeV gamma rays is 0.70 cm
IEEE Transactions on Nuclear Science | 2006
Seiichi Yamamoto; Naoaki Shimura; Hiroyuki Ishibashi
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ieee nuclear science symposium | 2007
Tatsuya Usui; H.Yamamoto; Y.Yokoyama; Shigenori Shimizu; Naoaki Shimura; Y. Kurata; Hiroyuki Ishibashi
. We observed that the light output and decay time are dependent on the Ce concentration in the crystal. Decay constant decreases with increasing Ce. Annealing of the colored crystal having 2.0 mol% Ce makes it colorless with better scintillation properties: large light output (40% of NaI:Tl), good energy resolution (8.3% for 4
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