Abstract
The 238U, 226Ra and 232Th contents of six samples from the Mandena black sand placer deposit were determined by gamma-ray spectrometry and varied from 2280 to 4600 Bq/kg, 1530 to 2900 Bq/kg and 11,600 to 25,400 Bq/kg, respectively. The activity concentration of 232Th is significantly higher than 238U and there is no equilibrium between 238U and 226Ra. Due to the gamma interferences at the line 1461 keV and very high 228Ac activity, the 40K was calculated through potassium analyzed using ICP-AES and varied from 1 to 19 Bq/kg. The calculated gamma absorbed dose rate ranged from 7700 to 16,700 nGy/h.
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