Purification of lanthanides for large neutrino detectors: Thorium removal from gadolinium chloride
Purification of lanthanides for large neutrino detectors: Thorium removal from gadolinium chloride
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用于大型中微子探测器的镧系元素的纯化：从氯化钆中去除钍
DOI：
10.1016/j.nima.2010.02.124
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发表时间：
2010
影响因子：
1.4
通讯作者：
R. Hahn
中科院分区：
文献类型：
--
作者：
M. Yeh;J. Cumming;S. Hans;R. Hahn
金属负载液体微中子发生器是各种中微子实验的首选探测器。已经开发了通过溶剂萃取或金属化合物的直接溶解将金属转移到有机液体中的方法。与金属一起引入闪烁体的痕量天然放射性可能产生不希望的背景。使用a229 Th示踪剂的测量表明，在制备钆负载化合物之前，包括pH控制的部分水解和过滤可以将钍减少100倍。这种“自清除”方法的优点是它只使用生产过程中遇到的试剂。可以避免添加非元素清除剂如铁，或使用溶剂萃取或离子交换程序。它还通过去除微量的铁来提高蓝色区域的光透射率。这种提纯方法具有潜在的应用，以大规模生产的其他金属负载的液体澄清剂和用于去除痕量的钍在镧系元素的工业生产。
Metal-loaded liquid scintillators are the detectors of choice for various neutrino experiments. Procedures have been developed to transfer metals into organic liquids by solvent extraction or direct dissolution of a metallic compound. Traces of natural radioactivity introduced into the scintillator with the metal may produce undesirable backgrounds. Measurements using a229Th tracer indicate that the inclusion of a pH-controlled partial hydrolysis and filtration prior to the preparation of a gadolinium-loading compound can reduce thorium by a factor of ∼100. This “self-scavenging” procedure has the advantage that it uses only reagents encountered in the production process. Addition of non-elemental scavengers such as iron, or the use of solvent extraction or ion exchange procedures can be avoided. It also improves the optical transmission in the blue region by removing traces of iron. This purification method has potential applications to the large-scale production of other metal-loaded liquid scintillators and for the removal of traces of thorium in the industrial production of lanthanides.