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Reduction of the radioactivity in sodium iodide (NaI) powder by recrystallization method

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Abstract

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.

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Acknowledgements

We thank J.S. Choi for ICP-MS measurements. This research was funded by the Institute for Basic Science (Korea) Under Project Code IBS-R016- A1. HyangKyu Park was supported by a Korea University Grant.

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Authors and Affiliations

  1. Center for Underground Physics, Institute for Basic Science, Daejeon, 34126, Korea

    KeonAh Shin, Olga Gileva, Yeongduk Kim & Hyun Su Lee

  2. Department of Accelerator Science, Graduate School, Korea University, Sejong, 30019, Korea

    HyangKyu Park

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  1. KeonAh Shin
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  2. Olga Gileva
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  3. Yeongduk Kim
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  4. Hyun Su Lee
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  5. HyangKyu Park
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Correspondence to HyangKyu Park.

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Shin, K., Gileva, O., Kim, Y. et al. Reduction of the radioactivity in sodium iodide (NaI) powder by recrystallization method. J Radioanal Nucl Chem 317, 1329–1332 (2018). https://doi.org/10.1007/s10967-018-6006-y

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  • DOI: https://doi.org/10.1007/s10967-018-6006-y

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