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The mass fractions of Cl, Br and I were obtained by radiochemical neutron activation analysis (RNAA) of seventeen USGS geochemical reference materials (RMs), for which we had published halogen contents in GGR (Sekimoto and Ebihara 2017). Except for three RMs, 100 mg to > 300 mg of each powder material was used for a single analysis. After 10 min of neutron irradiation, a rapid radiochemical purification...