Tl2LaCl5（Ce3 +）：用于X和γ射线探测的新型快速高效闪烁体
Tl2LaCl5 (Ce3+): New Fast and Efficient Scintillator for X- and γ-ray detection
摘要：
本文报道了新的Tl_2LaCl_5：xCe ~（3+）（x = 0，0.5，1，10mol%）单晶的闪烁性能。采用两区垂直布里奇曼技术生长了这种闪烁材料。这种材料的高Z值（79）为X射线和γ射线提供了出色的探测效率。生长的样品在X射线和γ射线激发下进行表征，以确定发射波长、能量分辨率、光产额和衰减时间。发射光谱在350 - 550 nm之间显示Ce 3+发射带，峰值在389 nm处。获得的能量分辨率和光产额增加与高Ce浓度。在室温下，掺10%Ce样品的能量分辨率和光产额分别为6.9%（FWHM）和51，000 ± 5000 ph/MeV。对于生长的样品，发现两个指数衰减时间常数。测量的衰减时间常数显示其值相对于在主晶体中的Ce-浓度的变化。10%Ce样品的快衰减时间常数为31 ns，光发射率为87%。闪烁实验结果表明，TLC将是正电子发射断层成像（PET）等医学成像技术中有前途的下一代闪烁体之一。
英文摘要：
Scintillation properties of the new Tl2LaCl5: xCe3+ where x = 0, 0.5, 1 and 10 mole % (TLC: Ce3+) single crystals are presented. Two zones vertical Bridgman technique is used for the growth of this scintillation material. High Z-number (79) of this material offer excellent detection efficiency for X- and γ-rays. Grown samples are characterized under X- and γ-rays excitation in order to find the emission wavelength, energy resolution, light yield, and decay time. Emission spectra exhibit Ce3+ emission bands between 350 - 550 nm and peaking at 389 nm. The obtained energy resolution and light yield increases with high Ce-concentration. Energy resolution and light yield of 10%Ce-doped sample are found to be 6.9% (FWHM) and 51,000+-5000 ph/MeV, respectively at room temperature. For the grown samples, two exponential decay time constants are found. The measured decay time constants showed variation in their values with respect to Ce-concentrations in the host crystal. Fast decay time constant of 31 ns with 87% light emission is found for 10%Ce sample. Scintillation results suggested that TLC will be one of the promising next generation scintillator for the medical imaging techniques such as Positron Emission Tomography (PET).
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