Title :
Radiation response of transition metals-doped lithium aluminate crystals
Author :
Fujimoto, Yasutaka ; Yanagida, T. ; Kamada, K. ; Pejchal, Jan
Author_Institution :
Kyushu Inst. of Technol., Kitakyushu, Japan
fDate :
Oct. 27 2013-Nov. 2 2013
Abstract :
Basic radiation response properties of lithium aluminate LiAlO2 crystals activated with transition metals like Ti, Mn and Cu were examined. When X-ray excited the crystals, intense emission peaks were observed at visible wavelength regions, they are ascribed to the Ti4+ charge transfer (Ti-doped), Mn2+ 3d5-3d5 (Mn-doped) and Cu+ 3d94s-3d10 (Cu-doped) transitions. The scintillation decay times were estimated to be about 1.8 μs (93 %) and 9.9 μs (7 %) for the Ti-doped crystal, 310 μs (96 %) and 2220 μs (4 %) for Mn-doped one, and 3.6 μs (52 %) and 19.6 μs (48 %) for Cu-doped one, respectively. In the 252Cf neutron irradiated pulse height spectra, Ti- and Cu- doped crystals showed higher light yield in comparison to that of GS20 commercial scintillator.
Keywords :
charge transfer states; copper; lithium compounds; manganese; photoluminescence; scintillation; solid scintillation detectors; titanium; 252Cf neutron irradiated pulse height spectra; GS20 commercial scintillator; LiAlO2:Cu; LiAlO2:Mn; LiAlO2:Ti; X-ray excitation; charge transfer; intense emission peaks; light yield; radiation response properties; scintillation decay times; transition metal-doped lithium aluminate crystals; visible wavelength regions; Crystals; Light emitting diodes; Lithium; Neutrons; Optical pulses; Photonics; Radiation effects;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
DOI :
10.1109/NSSMIC.2013.6829660
