High Efficiency Medical Scintillator Lu<SUB>2</SUB>SiO<SUB>5</SUB>:Ce Studied by VUV Spectra

QI Ze-Ming; ZHANG Guo-Bin; SHI Chao-Shu; LIU Bo; REN Guo-Hao; TAO Ye; XU Jian-Hua

Chinese Physics C> 2003, Vol. 27> Issue(S1) : 32-34

High Efficiency Medical Scintillator Lu₂SiO₅:Ce Studied by VUV Spectra

National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China2 Shanghai Institute of Ceramics,CAS,Shanghai 200050,China3 Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
High efficiency medical scintillator Lu₂SiO₅:Ce was studied by Synchrotron Radiation VUV spetra.The results show that two excitation bands in the range 250—320nm of powder sample become very weak in comparison with those of single crystal sample.The difference of the excitation band assigned to band to band transition between the two samples indicates that there are different defects in these two samples.Under VUV excitation (185nm),the emission spectrum of the two samples are similar.The emission band in the rage of 350—500nm corresponding to 5d→4f transitions of Ce³⁺.It can be decomposed to three sub-band which come from two types of Ce³⁺ luminescence centers.A new weak emission band was observed under VUV excitation.It possibly originates from the second type of Ce³⁺ luminescence centers of defect.

References

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LIU Bo, SHI Chao-Shu. Chinese Science Bullelin, 2002, 47: 1 ( in Chinese)(刘波，施朝淑.中国科学，2002, 47:1)2 Hofstadter R. Phys. Rev. ,1948,74:1003 Weher M T, Monchamp R R. J. Appl. Phys. , 1973, 44 :54954 Melcher C L el al. SCINT95, Delft University Press, Nelherlands,1996, 3095 LU Y S el al. SCINT97, Shanghai, 1997, 186 Takagi K el al. Appl. Phys. Lett. , 1983,42: 437 Ishibashi H et al. IEEE Trans. Nucl. Sci. , 1998,45:5188 Surli S et al. IEEE Trans. Nucl. Sci. , 2000,47:10309 Melcher C L et al. Nucl. Tnstr. Meth. , 1992, A314 :21210 Suzuki H, Tombrello T A, Melcher C L et al. IEEE Trans. Nucl.Sci. ,1993,40:38011 Chaushu Shi, HAN Zhen-Fu, HUANG Shi-Hua et al. J. Elect.Spectra. Related. Phenom. ,1999, 101-103 :633-63512 Suzuki H, Tomhrello T A, Melcher C L et al. J. Lumin. , 1994,6061:963

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QI Ze-Ming, ZHANG Guo-Bin, SHI Chao-Shu, LIU Bo, REN Guo-Hao, TAO Ye and XU Jian-Hua. High Efficiency Medical Scintillator Lu₂SiO₅:Ce Studied by VUV Spectra[J]. Chinese Physics C, 2003, 27(S1): 32-34.

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Received: 2003-11-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

High Efficiency Medical Scintillator Lu₂SiO₅:Ce Studied by VUV Spectra

Corresponding author: QI Ze-Ming,

National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China2 Shanghai Institute of Ceramics,CAS,Shanghai 200050,China3 Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2003-11-21
Accepted Date: 1900-01-01
Available Online: 2003-01-02

Abstract: High efficiency medical scintillator Lu₂SiO₅:Ce was studied by Synchrotron Radiation VUV spetra.The results show that two excitation bands in the range 250—320nm of powder sample become very weak in comparison with those of single crystal sample.The difference of the excitation band assigned to band to band transition between the two samples indicates that there are different defects in these two samples.Under VUV excitation (185nm),the emission spectrum of the two samples are similar.The emission band in the rage of 350—500nm corresponding to 5d→4f transitions of Ce³⁺.It can be decomposed to three sub-band which come from two types of Ce³⁺ luminescence centers.A new weak emission band was observed under VUV excitation.It possibly originates from the second type of Ce³⁺ luminescence centers of defect.