Twenty three rock samples were collected from various altitudes of Nilgiri hills, Tamil Nadu, India. A survey was carried out to determine the activity concentration of selected radionuclides (238U, 232Th, 40K) by means of gamma-ray spectroscopy using NaI (Tl) detector. From the measured spectra, the mean activity of 238U, 232Th, 40K are 7.13 Bq kg–1, 30.47 Bq kg–1 and 346.06 Bq kg–1, respectively. To evaluate the radiological effects, the absorbed dose rate, effective absorbed dose rate, radium equivalent activity, external and internal hazard indices, and radioactivity level index are also calculated. The mean absorbed dose rate of gamma radiation ranged from 11.90 nGy h–1 to 108.22 nGy h–1. The activity concentration of 238U, 232Th, 40K and the various radiological effects are below the internationally recommended maximum values.
No takes yet. Share an insight, caveat, or question.
Krishnamoorthy et al. (2013) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: