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6906241 
Journal Article 
Reduction of the radioactivity in sodium iodide (NaI) powder by recrystallization method 
Shin, K; Gileva, O; Kim, Y; Lee, HSu; Park, H; , 
2018 
Yes 
Journal of Radioanalytical and Nuclear Chemistry
ISSN: 0236-5731
EISSN: 1588-2780 
SPRINGER 
DORDRECHT 
1329-1332 
WOS:000441981500013 
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.