18 research outputs found
Beads, cowries, and cultural translations of the Atlantic experience in Yorubaland, 1600-1850
African Studies Center Papers in the African Humanities No. 3
Estimation of Residents Exposure Risks to Radiological Parameters in Some Building Materials in Nigeri
Some of the brands of tiles commonly available in the markets in Nigeria, which are
used for building purposes, were analysed in order to estimate the concentration of naturally
occurring radionuclides. The analysis was done with the aid of High-Purity Germanium (HPGe)
detector. The results revealed that the average activity concentrations in the sample of tiles,
cement and sand varied from 41 ± 4 to 96 ± 8.3, 27 ± 9.5 to 76.5 ± 2.5 and 140 ± 7.9 to 940 ±
19.2 Bqkg-1 for 232Th, 226Ra and 40K, respectively. The results obtained were used to determine
the impact of these building materials on users. The radium equivalent activity (Raeq) ranged
between 125 – 280 Bqkg-1 and were observed to be lower than 370 Bqkg-1 in all the samples
tested, which is the recommended safe limit. Similarly, the absorbed dose rates were noted to
vary from 51.00 – 122.52 nGyh-1. However, one of the samples examined showed a result of
122.52 nGyh- for the indoor absorbed dose rate (DR), which is higher than the internationally
recommended safe value of 80 nGyh-1according to USEPA. The results revealed that the building
materials investigated do not pose any danger to the end users