ARI MA: "Green" Aqueous Liquid Scintillator for Nuclear Materials Interdiction

1039102马托夫这项提议是为了开展跨学科的实验研究工作，以开发一种稀水“绿色”液体闪烁体。所提出的闪烁体是基于一种全新的机制，利用了水中通过辐射相互作用产生的大量OH-自由基的高化学能量含量。研究方法是确定哪些化合物能与OH自由基反应形成已知荧光产物的激发态，或易用作染料增感体系的增感剂。初步结果已经显示了一个模型体系对OH自由基反应的微弱光输出。这种稀水闪烁体将显著减少用于示踪工作的液体闪烁计数在生物医学应用中的混合废物(放射性危险化学混合物)的产生；还将显著节省大型闪烁探测器的成本，例如用于门户监测或在地下进行的低本底实验中用作否决权/缓冲剂的探测器。闪烁体是“绿色”的，因为它是一种稀水溶液，不同于传统液体闪烁体有毒、易燃的苯系物。这项拟议的研究将增强国家的威胁检测姿态。水相闪烁体在生物医学应用中也将非常有用，包括“液体闪烁计数”，它们将缓解或消除在这项技术中遇到的混合废物问题。坦普尔大学的研究生和本科生将积极参与这项研究。坦普尔大学是一所城市研究型大学，招收大量少数民族学生。

1039102MartoffThis proposal is for an interdisciplinary research effort of experimental work to develop a dilute aqueous "green" liquid scintillator. The proposed scintillator is based on an entirely new mechanism taking advantage of the high chemical-energy content of OH-radicals which are copiously produced in water by radiation interactions. The research approach is to identify compounds which are reactive with OH radicals to form excited states of known fluorescent products, or are susceptible to use as sensitizers in dye-sensitizer systems. Preliminary results have already shown weak light output from one model system in response to OH radical reactions. Such a dilute aqueous scintillator would result in significant reduction in mixed waste (radioactive hazardous chemical mixtures) production in biomedical applications of liquid scintillation counting for tracer work; and also dramatic cost savings in large scintillation detectors such as those used for portal monitoring or as vetoes/buffers in low background experiments conducted underground."Green" liquid scintillator suitable for widespread deployment in large volume gamma ray and neutron screening detectors. The scintillator is "green" because it is a dilute water solution, unlike the toxic, flammable benzenoid systems of conventional liquid scintillators. The proposed research would enhance the nation's threat detection posture. Aqueous scintillators would also be highly useful in biomedical applications involving "liquid scintillation counting", where they would ease or eliminate the mixed waste problem encountered in this technique. Graduate and undergraduate students at Temple University, an urban research university with substantial minority enrollment, would be activelyinvolved in the research.