用于快中子光谱和成像应用的低余辉、高Refractive-Index液体闪烁体
Low-Afterglow, High-Refractive-Index Liquid Scintillators for Fast-Neutron Spectrometry and Imaging Applications
摘要：
对于高强度脉冲激光装置的离子和中子光谱测定以及成像应用，需要具有非常低的余辉的快速液体澄清器。此外，利用光纤（或液芯）毛细管阵列的中子成像需要具有高折射率的闪烁材料。为此，我们已经研究了各种组合的建立混合物的氟和溶剂，这是丰富的交替与氮或氧。已知溶解的分子氧是高效的猝灭剂，其有效地抑制荧光体中的三重态的布居，三重态是余辉的主要原因。为了测量发光体的发光曲线，我们采用了时间相关单光子计数（TCSPC）技术，其特点是光强度的几个数量级的高动态范围。本文概述了快速闪烁体的应用，简要介绍了液体闪烁的机理，描述了我们的TCSPC方法，并讨论了结果。
英文摘要：
For ion and neutron spectrometry and imaging applications at a high intensity pulsed laser facility, fast liquid scintillators with very low afterglow are required. Furthermore, neutron imaging with fiber (or liquid-core) capillary arrays calls for scintillation materials with high refractive index. To this end, we have examined various combinations of established mixtures of fluors and solvents, that were enriched alternatively with nitrogen or oxygen. Dissolved molecular oxygen is known to be a highly effective quenching agent, that efficiently suppresses the population of the triplet states in the fluor, which are primarily responsible for the afterglow. For measuring the glow curves of scintillators, we have employed the time-correlated single photon counting (TCSPC) technique, characterized by high dynamic range of several orders of magnitude in light intensity. In this paper we outline the application for the fast scintillators, briefly present the scintillation mechanism in liquids, describe our specific TCSPC method and discuss the results.
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