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Evaluation of radiological hazards and trace element contamination around thermal power plant at Udupi on the Southwest coast of India

Achari Sandesh, Ramanand Vinutha Pudiyaneravana, Shivanandappa Kaliprasad Chikkahalkur, Yerol Narayana

Acta Geophysica

2023

Vol. 71, no. 3

1289--1303

Coastal Karnataka on the southwest coast of India is heading to become a region of major industrial activity center with the operation of oil refineries, petrochemical complexes and nuclear and thermal power stations. In view of this, studies have been initiated on radioactivity and trace elements to assess the impact of these industrial activities on the human population and environment of the region. As a result, the radiological hazards originating from radioactivity in soil and fly ash were evaluated in the vicinity of a thermal power plant at Udupi in coastal Karnataka. The gamma ray spectrometer techniques were employed to measure radioactivity in soil and fly ash sample. The mean activity concentration of 40K, 232Th and 226Ra in soils was found to be 190.64 ± 3.60 Bq kg-1,43.74 ± 2.17 Bq kg-1 and 59.36 ± 1.74 Bq kg-1 similarly for fly ash it was found to be 229.37 ± 4.22 Bq kg-1, 28.29 ± 1.73 Bq kg-1 and 39.06 ± 1.49 Bq kg-1, respectively. The possible impact of natural radiation on a human has been assessed by calculating the hazards parameters. Spatial distribution of natural radionuclides in the study area was also investigated for radioactivity disequilibrium. Major mineralogical analysis was carried out using XRD and FTIR techniques. The trace element C, O, Al, Si, Fe, Ti, Cr, K, Mg, Mn and Ni in soil were determined by FESEM/EDS. The soil in the region was found to be rich in aluminum and silica, with iron being the next most abundant element.

Natural radionuclides in rocks and their association with the mineralogy of rocks in Dakshina Kannada region of southern India

Lokesh Narsha, Vinutha Pudiyaneravana Ramanand, Malleshi Kavasara, Narayana Yerol

Acta Geophysica

2022

Vol. 70, no 5

2149--2160

The radioactivity levels of natural radionuclides 226Ra, 232Th, and 40K in the rocks of Dakshina Kannada region of southern India were measured by NaI (Tl) gamma-ray spectrometer. The specific activities of 226Ra, 232Th, and 40K ranged from 4.2±0.4 to 74.5±1.7 Bq kg−1, 14.5±0.7 to 83.5±1.6 Bq kg−1, and 172±3 to 964±7 Bq kg−1 with the mean of 25.1±1.0 Bq kg−1, 36.1±1.0 Bq kg−1, and 502±5.0 Bq kg−1, respectively. The normality of the frequency distribution curves of 226Ra, 232Th, and 40K was tested using the Kolmogorov–Smirnov test. The radiological hazard indices were computed from the measured activity concentration of natural radionuclides in rocks and these were found to be within acceptable levels. To investigate the sources of radioactivity, the minerals involved in the rocks were detected using XRD and FTIR. The mineralogical studies reveal that the principal sources of gamma radiation in the study area are 232Th-rich phosphates and 40K-bearing feldspars.