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Characterization of water-based liquid scintillator response to gammas and neutrons at varying scintillator-surfactant concentrations

机译:在不同的闪烁体 - 表面活性剂浓度下表征水基液体闪烁体对伽玛和中子的响应

摘要

Large scale solar neutron and neutrino flux experiments require many tons of bulk liquid organic scintillator to take spectroscopic data of these energetic particles. However, material and chemical concerns make such experiments both challenging and costly. In their work, Winn and Raftery prepose a method of water-based scintillator as a viable alternative to liquid organic scintillator. Investigation into the light yield and light attenuation of this material is conducted, providing promising results. The scintillator pair PPO and POPOP serve as the primary and secondary fluor for the bulk scintillator, dissolved in Triton-X surfactant to fix the issue polar/non-polar solubility. A scintillator mixture comprised of 3.000 grams PPO, 0.075 grams POPOP, 240.0 grams of Triton-X diluted in deionized water is identified to produce optimal light yield. The relationship of response of the water-based liquid scintillator to Sodium-22 (²²Na) 511 keV gamma source and Americium-24 Beryllium (AmBe) 2-10 MeV neutron source is explored by taking pulse area spectra data at scintillator-surfactant concentrations of 0.5%, 1.0% and 2.0%. An analysis of light yield reveals an increasing linear correlation between observed count rates and increasing scintillator-surfactant concentration. Systematic error inherent in the experiment is discussed and suggestions for future work are proposed.
机译:大规模太阳中子和中微子通量实验需要大量的液态有机闪烁体来获取这些高能粒子的光谱数据。然而,材料和化学方面的考虑使此类实验既具有挑战性又成本高昂。在他们的工作中,Winn和Raftery提出了一种水基闪烁体的方法来替代液体有机闪烁体。对该材料的光产率和光衰减进行了研究,提供了可喜的结果。闪烁体对PPO和POPOP用作本体闪烁体的主要和次要氟,溶解在Triton-X表面活性剂中以解决极性/非极性溶解度问题。确定了由3.000克PPO,0.075克POPOP,240.0克在去离子水中稀释的Triton-X组成的闪烁体混合物,以产生最佳的光产量。通过在闪烁体-表面活性剂浓度为60%的情况下获取脉冲面积光谱数据,探索了水性液体闪烁体对钠22(²Na)511 keVγ源和A 24铍(AmBe)2-10 MeV中子源的响应关系。 0.5%,1.0%和2.0%。对光产量的分析表明,观察到的计数率与闪烁剂-表面活性剂浓度的增加之间线性相关性增加。讨论了实验中固有的系统误差,并提出了今后工作的建议。

著录项

  • 作者

    Chilton Lauren (Lauren M.);

  • 作者单位
  • 年度 2012
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

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