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A novel inorganic scintillator: Lu{sub}2Si{sub}2O{sub}7:Ce{sup}(3+) (LPS)

机译:一种新型无机闪烁体:Lu {sub} 2si {sub} 2o {sub} 7:ce {sup}(3+)(lps)

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摘要

We have characterized the gamma and X-ray scintillation properties of Ce{sup}3+ doped Lu{sub}2Si{sub}20O{sub}7, a lutetium pyro-silicate (LPS) material. The rare earth ions are located in an octahedral site with C{sub}2 symmetry. The compound exhibits chemical stability, transparency in a wide optical range and congruent melting, which allows growing of single crystals of good optical quality. The melting temperature is about 2000°C, slightly lower than that of Lu{sub}2SiO{sub}5 (LSO). Two maxima at 305 nm and 355 nm are observed in the optical absorption spectrum The emission spectrum of Ce{sup}3+ in LPS shows a broad band peaking at 380 nm. For nominal Ce{sup}3+ atomic concentrations in the range 0.005-0.01, the light yield varies in the range 13,000-23,000 photons/MeV under gamma-ray excitation. The actual cerium concentration inside the crystal still needs to be determined. The scintillation decay time is around 30 ns and, in the first studies, neither a long component nor afterglow was observed.
机译:我们表征了Ce {sup} 3+掺杂Lu {sub} 2si {sub} 20o {sub} 7的γ和X射线闪烁特性,乳酸乳酸乳酸乳酸乳酸盐液。稀土离子位于具有C {Sub} 2对称的八面体位点。该化合物具有化学稳定性,在宽光学范围内的透明度和一致熔化,这允许种植良好的光学质量的单晶。熔融温度约为2000℃,略低于Lu {sub} 2sio {sub} 5(LSO)。在光学吸收光谱中观察到305nm和355nm的两个最大值,LPS中的CE {sup} 3+的发射光谱显示在380nm处的宽带峰值。对于标称CE {SUP} 3+原子浓度在0.005-0.01的范围内,光率在γ射线激发下的13,000-23,000光子/ MEV范围内变化。晶体内的实际铈浓度仍然需要确定。闪烁衰减时间是大约30 ns,并且在第一研究中,既没有观察到长部件也不观察到余辉。

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