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Start Over Author "Kawaguchi, Noriaki" Journal radiation measurements
121 results on '"Kawaguchi, Noriaki"'

45. Scintillation characteristics of Tm3+ in Ca3(BO3)2 crystals

Author

Fujimoto, Yutaka, primary, Yanagida, Takayuki, additional, Yokota, Yuui, additional, Kawaguchi, Noriaki, additional, Fukuda, Kentaro, additional, Totsuka, Daisuke, additional, Watanabe, Kenichi, additional, Yamazaki, Atsushi, additional, and Yoshikawa, Akira, additional

Published
2011
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46. Study of VUV emission and γ-ray responses of Nd:BaF2 scintillaotor

Author

Yanagida, Takayuki, primary, Kawaguchi, Noriaki, additional, Yokota, Yuui, additional, Ishidu, Sumito, additional, Fukuda, Kentaro, additional, Yoshikawa, Akira, additional, Pejchal, Jan, additional, Nikl, Martin, additional, Babin, Vladimir, additional, Sekiya, Hiroyuki, additional, and Kamada, Kei, additional

Published
2010
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47. Doubly doped BaY2F8:Er,Nd VUV scintillator

Author

Pejchal, Jan, primary, Nikl, Martin, additional, Fukuda, Kentaro, additional, Kawaguchi, Noriaki, additional, Yanagida, Takayuki, additional, Yokota, Yuui, additional, Yoshikawa, Akira, additional, and Babin, Vladimir, additional

Published
2010
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48. Neutron detection with LiCaAlF6 scintillator doped with 3d-transition metal ions.

Author

Kawaguchi, Noriaki, Yanagida, Takayuki, Fujimoto, Yutaka, Furuya, Yuki, Futami, Yoshisuke, Yamaji, Akihiro, Watanabe, Kenichi, Yamazaki, Atsushi, Uritani, Akira, Kajimoto, Shinji, Fukumura, Hiroshi, Kurosawa, Shunsuke, Yokota, Yuui, Pejchal, Jan, and Yoshikawa, Akira

Subjects
*NEUTRON counters, *LITHIUM compounds, *SCINTILLATORS, *DOPED semiconductors, *TRANSITION metal ions, *RADIATION measurements, *RADIOLUMINESCENCE
Abstract

Abstract: Capability of thermal neutron detection was examined for LiCaAlF6 (LiCAF) scintillators doped with 3d-transition metal ions. Their radioluminescence spectra were measured with an 241-Am source to simulate 6Li(n, α)3H reaction. The sufficiently intense radioluminescence was observed for the Mn, Co and Cu dopants, while only a weak one was observed for Ti, V, Fe and Ni. A Mn doped LiCAF crystal, which showed the highest radioluminescence intensity, was coupled with a Si avalanche photodiode for the examination of its neutron response. It was confirmed that the average current of the photodiode clearly increased under excitation with 13.5 meV neutron flux. [Copyright &y& Elsevier]

Published
2013
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49. Ce and Eu-doped LiSrAlF6 scintillators for neutron detectors

Author

Yanagida, Takayuki, Kawaguchi, Noriaki, Fujimoto, Yutaka, Yokota, Yuui, Yamazaki, Atsushi, Watanabe, Kenichi, Kamada, Kei, Yoshikawa, Akira, and Chani, Valery

Subjects
*LITHIUM compounds, *SCINTILLATORS, *NEUTRON counters, *THERMAL neutrons, *FRACTURE mechanics, *ALPHA rays
Abstract

Abstract: Ce 1%, Eu 1%, and Eu 2%-doped LiSrAlF6 (LiSAF) single crystals were grown by the micro-pulling-down method for thermal neutron applications. The crystals were transparent, 2.0 mm in diameter and 20–40 mm in length. Neither visible inclusions nor cracks were observed. Their transmittance spectra were measured. The strong absorption lines were observed at 200, 240, and 300 nm for Ce:LiSAF due to Ce3+ 4f–5d transition. In Eu:LiSAF, 200 (4f–5d) and 300 (4f–4f) nm absorption lines were detected. The samples demonstrated strong emission peaks at 300 nm (Ce:LiSAF) and 370 nm (Eu:LiSAFs) when they were irradiated with 241Am α-rays simulating the α-particles from the 6Li(n, α) reaction. Thermal neutron responses were examined under 252Cf irradiation. The absolute light yield of Ce, Eu 1%, and Eu 2% crystals were 3400, 18000, and 30000 ph/n, respectively. Main components of the scintillation decay time of Ce, Eu 1%, and Eu 2%-doped LiSAFs were 63, 1293, and 1205 ns. [Copyright &y& Elsevier]

Published
2011
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50. Eu and Rb co-doped LiCaAlF6 scintillators for neutron detection.

Author

Yamaji, Akihiro, Yanagida, Takayuki, Kawaguchi, Noriaki, Yokota, Yuui, Fujimoto, Yutaka, Kurosawa, Shunsuke, Pejchal, Jan, Watanabe, Kenichi, Yamazaki, Atsushi, and Yoshikawa, Akira

Subjects
*EUROPIUM, *RUBIDIUM, *DOPED semiconductors, *LITHIUM compounds, *SCINTILLATORS, *NEUTRON counters, *CRYSTAL growth
Abstract

Abstract: Eu and Rb co-doped LiCaAlF6 (LiCAF) single crystals with different dopant concentrations were grown by the micro-pulling-down method for neutron detection. Their transmittance spectra showed strong absorption bands at 200–220 and 290–350 nm, and under 241Am alpha-ray excitation, their radioluminescence spectra exhibited an intense emission peak at 373 nm that was attributed to the Eu2+ 5d–4f transition. These results were consistent with those for the Rb-free Eu:LiCAF. The highest light yield among the grown crystals was 36,000 ph/n, which was 20% greater than that of the Rb-free crystal. In addition, the neutron-excited scintillation decay times were 650–750 ns slower than that of the Rb-free Eu:LiCAF. [Copyright &y& Elsevier]

Published
2013
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