Abstract
Due to thermocline and surface water from the western equatorial Pacific Ocean, which are transported to the Indian Ocean, Indonesian marine waters play an important role in the global ocean circulation. The objective of this study was to assess the spatial distribution of 137Cs in the Lombok Strait as part of a national monitoring program concerning the possible impacts of radionuclides released as a result of the Fukushima accident. Sampling was conducted in the Flores sea and Lombok Strait on 15 to 24 November 2013. Measurements for the Lombok strait showed that 137Cs concentrations at surface layer, thermocline layer and 1000m depth were 0.27Bqm−3; 0.42Bqm−3 and <MDA (0.01Bqm−3), respectively. The water concentration of 134Cs at all monitoring stations were under MDA (0.01Bqm−3). The results the study indicate that the radiocesium input was from global fallout.
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