The radiological hazards associated with naturally occurring radioactive materials in soil samples from different geological locations have been studied using gamma spectrometry. The average activity concentration of 226Ra, 232Th, and40K were (16.4-74.6 Bq/kg), (12.0-44.7 Bq/kg), and (215.4-498.6 Bq/kg). The highest values of 226Ra and 232Th occurred in Dodowa and Oyibi respectively. The 40 K recorded the highest activity concentration of 498.6 Bq/kg, measured in soil from McCarthy Hills. The radium equivalent activity (Raeq; 46.9-135.7 Bq/kg), the internal hazards index (Hin; 0.29-0.52) the external hazard index (Hex; 0.22-0.37), the absorbed dose rate in air (23.3-75.8 nGy/h), and the annual effective dose (EΤ) (44.4-79.4 uSv/y) were evaluated to assess the radiation hazard to the populace living in dwellings made of these soil as a building material. The results obtained were found to be within the acceptable limits for public exposure control recommended by the European Commission, International Commission on Radiological Protection, and Organization for Economic Cooperation and Development-Nuclear Energy Agency. (author)
Source/Report: Radiation Protection and Environment; v. 35(1); CODEN RPREFM; Jan-Feb 2012; p. 22-28; 33 refs., 2 figs., 3 tabs.
Publ. Year: 2012