A survey of top soil environmental radioactivity in Akwa Ibom State of Nigeria has bean investigated. The results vary considerably from one environment to another ranging between a minimum of 161 mBq·g–1 and a maximum value of 648 mBq·g–1
-activity. The work reveals that hospitals and health centres lead in top soil radioactivity with the highest mean values of
(378 mBq·g–1) and (294 mBq·g–1) followed closely by industrial areas with mean values of
(372 mBq·g–1) and (283 mBq· g–1) trailing beaches and recreation centres having average values of
(364 mBq·g–1) and (273 mBq·g–1). Lower levels of top soil radioactivity were observed mostly in environments with high level human interaction activity such as schools, offices, environments and recreation centres. An overall top soil mean of 342 mBq·g–1
-activity, 271 mBq·g–1
-activity and 71 mBq·g–1
-activity were observed in the State.
A survey of the environmental radioactivity in Uyo /5° N, 7° 50 E/, Nigeria has been done for the period 1981 to 1986. An overall average of 8.5±0.5 pCi is the environmental radioactivity for the surrounding air and 8.2±0.4 pCi for the top soil. Airborne -particles were also measured using CR-39 plastic detectors. The University Campus in Uyo had an overall average -activity of 75.3±0.8 fmCi while other sectors of the town had an average of 95.2±1.1 fmCi. Our results show a non-uniform distribution of - and other radioactivity in Uyo.
A survey of the environmental radioactivity in the Eastern States of Nigeria, consisting of Akwa Ibom and Corss River States has been done and that of Uyo (5°N, 7°50E), Nigeria, has been updated for the period of 1981 to 1991. An overall average of 329.7±13.3 mBq is the environmental radioactivity for the surrounding air in Akwa Ibom State, while 348.5±13.7 mBq is the activity for the air in Cross River State. There has been a marked increase of average environmental radioactivity in Uyo from 293.0±12.6 mBq to 373.7±14.8 mBq in recent years with a yearly mean of 324.1±13.7 mBq.