Reduction of the radioactivity in sodium iodide (NaI) powder by recrystallization method
Reduction of the radioactivity in sodium iodide (NaI) powder by recrystallization method
复制标题
重结晶法降低碘化钠（NaI）粉末的放射性
DOI：
10.1007/s10967-018-6006-y
复制
发表时间：
2018
影响因子：
1.6
通讯作者：
HyangKyu Park
中科院分区：
文献类型：
--
作者：
K. Shin;O. Gileva;Yeongduk Kim;Hyun Su Lee;HyangKyu Park
COSINE实验正在使用超低背景NaI闪烁晶体寻找暗物质。为了减少初始NaI粉末的内部污染以生长NaI晶体，使用去离子水通过分级重结晶纯化不同纯度的NaI粉末样品。主要放射性元素K、Pb、Th和U的浓度被降低到实验所需的水平，这些元素是暗物质搜索的主要背景。此外，其它杂质的浓度，例如，Ba、Ca、Cr和Fe也被还原，这对于实现高质量NaI晶体是重要的。
The COSINE experiment is searching for dark matter using ultra-low background NaI scintillating crystals. In order to reduce the internal contamination of the initial NaI powder to grow NaI crystals, NaI powder samples with different purities were purified by fractional recrystallization using de-ionized water. The concentrations of the main radioactive elements, K, Pb, Th, and U, which are major backgrounds for the dark matter search, were reduced to the level required for the experiment. Further, the concentrations of other impurities, e.g., Ba, Ca, Cr, and Fe, were also reduced, which is important to realize good quality NaI crystals.