Well water is an environmental component that is always used by people but is vulnerable to contaminated. The impact of the contamination of water bodies could cause danger to human health. Water pollution could be caused by radioactivity that exceeds recommended limits. Source of radionuclide pollutants in water bodies could be caused by the operation of nuclear facilities. Analysis of radioactivity has been carried out on several samples of well water near the TRIGA 2000 reactor facility, followed by calculating the internal and external hazard index of radiation dose. The results of the analysis using a gamma spectrometer show that the radionuclides contained in well water samples are not fission products, but they are Ra-226, Bi-214, Pb-214 and K-40 in the form of natural radionuclides. The highest radioactivity in the sample was 5.808 Bq/L from K-40 and the lowest was 0.103 Bq/L from Bi-214. The internal and external hazard index has been determined where the internal hazard index was 0.013-0.023 while the external hazard index was 0.006-0.012 which is below the maximum hazard index value based on UNSCEAR which is ⩽ 1. So, based on the results of this study on the radioactivity parameters show that well water is still safe to be used.
The midstream of Blanakan is located between upstream and downstream. Due to its location, the water of the midstream receives pollutants from nearby upstream. Hence, the purpose of this research is to investigate the concentration of Zn and coliform in the midstream. Coliform is one of the standards used for assessing water quality. The samples were collected from three stations in midstream. The Zn in water samples was analyzed by using AAS. Meanwhile, the coliform was examined by MPN and plate count methods. The results of obtained coliform then compared with the river water quality standards issued by Government Regulation No. 82 of 2001. In the midstream of Blanakan, the ranges of coliform were 7.5 x 10−1 MPN/ml, 9.3 x 101 MPN/ml, and 4.3 x 10−1 MPN/ml. Meanwhile, the ranges of Zn contents were 0.45 mg/l, 1.53 mg/l and 0.5 mg/l. According to Government Regulation No. 82 of 2001, the limit of Zn is 0.05 mg/l, and the limit for coliform is 10 MPN/ml. To conclude, the Zn contents in water indicated that pollutants had influenced the midstream of Blanakan from domestic waste disposal from nearby upstream.
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