Determination of trace level thorium and uranium in high purity gadolinium sulfate using ICP-MS with solid-phase chromatographic extraction resins

Ito, S.; Takaku, Y.; Ikeda, M.; Kishimoto, Y.

doi:10.1063/1.5018990

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Research Article| January 03 2018

Determination of trace level thorium and uranium in high purity gadolinium sulfate using ICP-MS with solid-phase chromatographic extraction resins

S. Ito;

S. Ito ^a)

1

Okayama University, Faculty of Science

, Okayama 700-8530,

Japan

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Y. Takaku;

Y. Takaku

2

Institute for Environmental Sciences, Department of Radioecology

, Aomori, 039-3212,

Japan

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M. Ikeda;

M. Ikeda

3

Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo

, Kamioka, Gifu 506-1205,

Japan

4

Kavli Institute for the Physics and Mathematics of the Universe (WPI), the University of Tokyo

, Kashiwa, Chiba, 277-8582,

Japan

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Y. Kishimoto

3

Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo

, Kamioka, Gifu 506-1205,

Japan

4

Kavli Institute for the Physics and Mathematics of the Universe (WPI), the University of Tokyo

, Kashiwa, Chiba, 277-8582,

Japan

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Author & Article Information

^a)

Corresponding author: [email protected]

AIP Conf. Proc. 1921, 030003 (2018)

https://doi.org/10.1063/1.5018990

The Super Kamiokand-Gadolinium (SK-Gd) project is the upgrade of the Super-Kamiokande (SK) detector in order to discover Supernova Relic Neutrinos (SRNs) by loading 0.2% of Gd₂(SO₄)₃ into a 50 kton of the SK water tank. In order to continue solar neutrino measurement with low energy threshold at ∼3.5 MeV, main radioactive contamination, U and Th in Gd₂(SO₄)₃, should be purified before loading. We developed solid-phase extraction technique to measure low concentration of U and Th in Gd₂(SO₄)₃ by ICP-MS. The extraction technique and current status will be presented.