Title :
Scintillation properties of Ce3+-doped, Pr3+-doped calcium orthoborate
Author :
Fujimoto, Y. ; Yanagida, T. ; Yokota, Y. ; Kawaguchi, N. ; Fukuda, K. ; Totsuka, D. ; Watanabe, K. ; Yamazaki, A. ; Yoshikawa, A.
Author_Institution :
IMRAM, Tohoku Univ., Sendai, Japan
fDate :
Oct. 30 2010-Nov. 6 2010
Abstract :
To develop new scintillators for thermal neutron detection, we investigated optical and scintillation properties of Ce3+-doped, Pr3+-doped Ca3(BO3)2 single crystals grown by the micro-pulling down (μ-PD) method. In optical transmission spectra, the absorption was observed around 275 and 345 nm correspond to the transition from the 4f ground state levels 2F5/2, 2F7/2 to 5d excited state of Ce3+ and Pr3+ transition from the ground state 3H to 5d state around 210-245 nm, respectively. The radioluminescence spectra showed intense peak around 400 nm (Ce3+:CBO) and 260-310 nm (Pr3+: CBO) under 241Am 5.5 MeV α-ray excitation due to the 5d-4f transition. The relative scintillation light yield of 0.5 % Ce3+: CBO crystal showed about 30 %, while that of 0.5 % Pr3+: CBO crystal showed about 10 % compared with that of reference Li-glass (GS20) scintillator under 252Cf neutron irradiation.
Keywords :
excited states; ground states; neutron detection; photoluminescence; solid scintillation detectors; ultraviolet spectra; visible spectra; 252Cf neutron irradiation; Ca3(BO3)2:Ce; Ca3(BO3)2:Pr; Ce3+ scintillation properties; Li-glass scintillator detector; absorption spectra; alpha-ray excitation; excited state; ground state level; micropulling down method; optical properties; optical transmission spectra; radioluminescence spectra; scintillation light yield; thermal neutron detection; Absorption; Crystals; Neutrons; Optical pulses; Optical sensors; Stationary state;
Conference_Titel :
Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE
Conference_Location :
Knoxville, TN
Print_ISBN :
978-1-4244-9106-3
DOI :
10.1109/NSSMIC.2010.5873744
