Activity concentration of 10 different brands of tiles made in Nigeria were analyzed using High purity
Germanium gamma detector and its hazard indices such as absorbed dose rate, radium equivalent activity,
external Hazard Index (Hex), internal Hazard Index (Hin), Annual Effective Dose (mSv/y), Gamma activity Index
(Iγ) and Alpha Index (Iα) were determined. The result showed that the average activity concentrations of
radionuclides (226Ra, 232Th and 40K) content are within the recommended limit. The average radium equivalent
is within the recommended limit of 370 Bq/kg. The result obtained further showed that the mean values for the
absorbed dose rate (D), external and internal hazard index, the annual effective dose (AEDR) equivalent, gamma
activity index and Alpha Index were: 169.22 nGyh−1, 0.95 and 1.14, 1.59 mSv/y, 1.00 Sv yr−1 and 0.34 respectively.
The result established that radiological hazards such as absorbed dose rate, internal hazard, annual
effective dose rate, gamma activity index and Alpha Index for some samples are found to be slightly close or
above international recommended values. The result for the present study was compared with tiles sample from
others countries, it was observed that the concentration of tiles made in Nigeria and other countries are closer,
however recommends proper radiation monitoring for some tiles made in Nigeria before usage due to the long
term health effec