Assessment of radiological parameters of soil in Kogi State, Nigeria
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Taylor & Francis
Abstract
Description
The natural radioactivity levels of soil samples collected from four local government areas in Kogi
State, Nigeria were measured using a hyper-pure germanium detector, and the radiological hazard
parameters associated with them were estimated. The measured concentration ranged from 7.82 §
0.63 to 82.22 § 1.99 Bq kg¡1 for 238U, 11.05 § 1.10 to 114.86 § 4.72 Bq kg¡1 for 232Th, and 3.38 §
0.50 to 1272.20 § 23.36 Bq kg¡1 for 40K. Omala local government was found to have the highest
concentrations of 238U (44.31 Bq kg¡1) and 232Th (52.13 Bq kg¡1), while Ajaokuta has the highest
concentration of 40K (711.72 Bq kg¡1). The lowest activity concentrations of 238U and 232Th were
measured from soil samples collected from Ankpa local government area and 40K from Dekina local
government area. It was noted that the activity concentrations of 40K were generally low for all the
areas investigated except for Ajaokuta areas. The radium equivalents calculated for all the locations
were observed to be lower than the radiation protection regulatory body reference value of 370 Bq
kg¡1. The radiological parameters estimated for most of the locations compared well with world
average values, except for Odogba-okaba, Salem University, Forest, Nepa, Gerugu, Niger Bridge,
Igaliwu, Ijeke-ogane, Bagana, and Abegikolo villages, whose values exceeded the recommended
limit. This may suggest that those living or working in these areas may be exposed to higher
radiation burden from the natural radionuclides.
Keywords
Q Science (General), QC Physics