Oh, Min-Seok Eliades, John A Kim, Minyoung Lee, Gwan-Ho Matsazuki, Hiroyuki Francisco, Barbara Kim, Joon Kon Yu, Byung Yong Sung, Chang min Seo, Seora LIM, WEON CHEOL Song, Seongeun Kim, Bogyong Moon, Sunwoo 2025-06-19T09:00:26Z 2025-06-19T09:00:26Z 2025-06-19 2025-09 0168-583X https://pubs.kist.re.kr/handle/201004/152639 Studies for 129I analysis by accelerator mass spectrometry (AMS) are presented. Alpha Aesar KI product 10978 (99.995 % purity) was measured to have 129I/127I = 1.6x10-14, suitable for use as carrier and background material. Iodine extraction from seawater using chloroform and n-hexane with iodine carrier showed hexane to have advantages and > 80 % extraction yield. An “iodine carrier-free” extraction method, co-precipitating other halides native to the seawater as carriers, was found to have > 98 % extraction yield. Results of seawater 129I concentrations measured at 3 AMS laboratories averaged 10 % agreement, similar to the last comparison 20 years ago. Conversely, 127I concentrations measured by ICP-MS were in good agreement between only two laboratories. Seawater 127I concentrations calculated from AMS results for samples treated using both carrier and carrier-free methods were in agreement with ICP-MS measurements, suggesting an alternative for 127I concentration measurements. Data for 8 Korean coastal seawater samples are also presented. English Elsevier BV 129I analysis of seawater at KIST: Carrier and carrier-free extraction techniques, an inter-laboratory comparison of results, and an alternative to ICP-MS 127I concentration measurements Article 10.1016/j.nimb.2025.165776 1 Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, v.566 Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 566 N scie scopus 001517432200001 Instruments & Instrumentation Nuclear Science & Technology Physics, Atomic, Molecular & Chemical Physics, Nuclear Instruments & Instrumentation Nuclear Science & Technology Physics Article IODINE SPECIATION I-129/I-127 PROGRESS SAMPLES WATERS SEA 129I Radio-iodine tracer Nuclear waste Radioactive contaminant tracer Iodine chemical treatment Accelerator mass spectrometry Iodine carrier Co-precipitation Seawater 127I Iodine