Preparation and characterization of highly lead-loaded red plastic scintillators under low energy x-rays
Preparation and characterization of highly lead-loaded red plastic scintillators under low energy x-rays
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DOI：
10.1016/j.nima.2011.08.062
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发表时间：
2011-12-21
影响因子：
1.4
通讯作者：
Normand, Stephane
中科院分区：
文献类型：
--
作者：
Hamel, Matthieu;Turk, Gregory;Normand, Stephane
为了开发用于激光兆焦耳（LMJ）设施惯性约束聚变（ICF）实验的空间分辨x射线成像系统，设计了新的塑料闪烁体。主要特点是衰减时间快，在10-40 keV范围内具有良好的红光发射和x射线光电吸收。这些闪烁体是由不同的单体与有机金属化合物共聚合成的。在这种基质中嵌入了两种荧光化合物，使能量从紫外光谱转移到近红外光谱。研究了几个参数：荧光团浓度、二次荧光团性质和铅浓度。铅的有效原子序数为53，铅的载重量为29%。为此，制备了小圆柱体，研究了其在x射线束下的性能，并与无机掺铈钇铝石榴石参考闪烁体（Y3Al5O12:Ce3+）进行了比较。最终，这种新型闪烁体或其下一代可以取代昂贵且易碎的无机闪烁体，从而产生强大的工业潜力。(C) 2011 Elsevier B.V.版权所有
To the aim of development of a spatially resolved x-ray imaging system intended for Inertial Confinement Fusion (ICF) experiments at the Laser Mega Joule (LMJ) facility, new plastic scintillators have been designed. The main characteristics are the following: fast decay time, red emission and good x-rays photoelectric absorption in the range 10-40 keV. These scintillators are synthesized by copolymerization of different monomers with an organometallic compound. In this matrix two fluorescent compounds are embedded, allowing to shift the energy from the UV to the near IR spectrum. Several parameters were studied: fluorophores concentration, nature of the secondary fluorophore and lead concentration. An outstanding effective atomic number of 53 has been reached, for a loading of lead corresponding to 29 wt%. Thus, small cylinders were prepared and their performances under x-ray beam studied and compared with those of inorganic Cerium-doped Yttrium Aluminum Garnet reference scintillator (Y3Al5O12:Ce3+)(.) Eventually, such new scintillators or their next generation could replace expensive and brittle inorganic scintillators, inducing a strong industrial potential. (C) 2011 Elsevier B.V. All rights reserved.