Abstract
Naturally occurring radioactive materials (NORMS) and fallout 137 Cs were estimated in surface soils from the highly mineralized Singhbhum region of Eastern India. The activity concentrations varied from 50.67-109.14 Bq/kg (238 U), 48.12-142.55 Bq/kg (226 Ra), 28.73-89.78 Bq/kg (232 Th), 494.84-1121.36 Bq/kg (40 K) and 1.8-7.48 Bq/kg (137 Cs). Correlation between radionuclides was studied. 232 Th/238 U concentration (Clark value) was also calculated. Radiation hazard for the samples was assessed by radium equivalent activity (Raeq ), external hazard index (Hex ), internal hazard index (Hin ) and absorbed gamma dose rate (D). Raeq values ranged from 216-263 Bq/kg, Hex values from 0.58-0.71 Bq/kg, Hin values from 0.73-1 Bq/kg and D values from 100-121 nGy/h. Calculated and observed dose rates in air were compared with the help of parametric and non-parametric tests. The tests showed significant difference between the calculated and observed dose rates.
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