RELATIVE EFFECT OF WATER QUALITY ON Cs-137 ACTIVITY IN LARANGAN WATER, TEGAL

Tegal is a city in Central Java experiencing rapid industrial development. The Larangan waters of Tegal receive household, agricultural, and industrial waste that flows directly into the Bongkok River. The purpose of this study was to determine the relative effects of water quality on 137Cs activity. We found that this wastewater has caused a decline in dissolved oxygen (DO), pH and salinity and an increase in water temperature. Current velocity and water depth increased with distance from the mouth of the river and affected the correlation regression between the water quality parameters. The correlation regression becomes stronger in waters that were affected by the land waste and was very weak at stations 4 and 5, which were not strongly influenced by the waste from the land. The correlation regression between 137Cs activity in the coastal waters under the influence of land showed a strong correlation with several water quality parameters such as DO, pH, temperature, as well as current velocity and water depth.