Evaluation of Radioactivity in Surabaya Coastal Estuary Ecosystem with Spectrometry α, β, γ

Abstract

Radioactivity levels have been measured in sediment samples, Echornia crassipes and Anadara granosa at the Surabaya river estuary. Measurement data were obtained by spectrophotometric method, which is a way of measuring and identifying radionuclides through observations of the spectrum emitted with detector material. The results of measurements and calculations that have been done show that the mean concentration of activity a, b, g (gross) in water in the Morokrembangan estuary and Kenjeran river estuary is still below the threshold value of group C waters quality. Radionuclide identification results indicate the presence of natural radionuclides K 40 , Tl 208 and Pb 212 , whereas artificial radionuclides Pu 239 and Cs 137 were not detected in all samples.

Water quality and fish health in the upper asahan river in supporting the sustainability of fish resources

“…The Asahan River is a lotic ecosystem where as an open ecosystem, the lotic ecosystem receives shipments of organic material carried by water flows from upstream or mainland areas, for example, in the form of carcasses, garbage, or fallen leaves into the river [4,5,6]. Based on the condition of the aquatic environment with vegetation in the form of shrubs, the flow of water is quite heavy, and the level of clarity is high, it is possible for the waters of the upstream of Asahan River to have a moderate to high diversity of fish species [7].…”