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79 Thus, geochronology of sediment using 137Cs is based on the fact that the depth of the peak concentration in the sediment column corresponds to the year 1963; 137Cs is also used to estimate rates of soil loss from agricultural land (He and Walling, 2003). Note that 134Cs is produced mainly by the neutron activation reaction of 133Cs in nuclear reactors and is not produced during nuclear explosions. Therefore, 134Cs in the environment results from its release from a nuclear power plant during an accident. Furthermore, the half-life of 134Cs is 2 y, too short to allow detection of the isotope’s activity after several decades; thus, its presence clearly represents a recent accident. We are currently engaged in ongoing research on the sedimentary environment in the Mekong River delta to assess the deltaic environment and its conservation status (Saito et al., 2012). During a survey of the deltaic sediment in October 2011, we conducted a geomorphological study and also took core samples. We were surprised to detect Cs isotopes released from the FDNPP in the core, and surveyed the same station the next year. The present study focuses on the Cs isotopes in the core in order to study the seasonal variations of this deltaic environment. Sediment erosion revealed by study of Cs isotopes derived from the Fukushima Dai-ichi nuclear power plant accident