Occurrence of Natural Radionuclides in Refuse Dump Sites Within the City of Ado-Ekiti, Southwestern Nigeria
Isinkaye M. Omoniyi and Faweya E. Babatope
Department of Physics, University of Ado Ekiti, Ado-Ekiti, Nigeria
Corresponding author: Isinkaye M. Omoniyi
Department of Physics
University of Ado-Ekiti
P.M.B. 5363
Ado-Ekiti, Nigeria
E-mail: niyikaye2002@yahoo.com
CEJOEM 2006, Vol.12. No.1.: 9–14
Key words:
Radionuclides, refuse dump, concentration, dose equivalent, gamma radiation
Abstract:
Natural radioactivity content of soil samples from thirty refuse dump sites in Ado-Ekiti,
southwestern Nigeria, was determined using a NaI(Tl)-based low-level gamma-counting system. Mean
concentrations of 758.51±132.93, 36.57±2.70 and 25.73±5.60 Bq·kg–1 were obtained for
40K, 226Ra(238U) and 228Ra(232Th),
respectively. The average absorbed dose rate and the annual effective dose equivalent amounted to
0.0646 μGy·h–1 and 0.40 mSv·yr–1, respectively, while the
collective effective dose equivalent of 59.8 manSv·y–1 was obtained for the whole city.
The values obtained did not constitute any radiological burden to the human population of the city.
Received: 7 April 2006
Accepted: 26 June 2006
| Back |