Browsing by Author "Usikalu MR"

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    Comparison between experimental and satellite temperature datasets in Covenant University
    (2018) Akinwumi SA; Omotosho TV; Usikalu MR; Odetunmibi OA; Ometan OO; Adewusi MO; Omeje M; Joel ES
    This article contains the ground and satellite meteorological data sets of clear-sky temperature events for five years (2012–2016) in Covenant University, Ota, Ogun State, Nigeria. The satellite data were obtained from Atmospheric Infrared Sounder (AIRS) while the ground data information were acquired from Davis weather station data logger-vantage pro2. These data were acquired from propagation study that used same location (Lat: 6.67°N and Long: 3.23°E) for both satellite data and radiometer directed along the same path by providing information about the temperature. The data sets were assessed and evaluated by means of a descriptive statistics. There was perfect agreement between the two data. The peak temperature events occurs between the months of November and April for the five years of observation for both Ota and AIRS Satellite. The data from this article can be used for further studies on non-rainy attenuation effect in the study area.
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    Data on the radiometric survey over a kaolinitic terrain in Dahomey Basin, Nigeria
    (2018) Adagunodo TA; Hammed OS; Usikalu MR; Ayara WA; Ravisankar R
    This article consists the in situ data sets of activity concentrations of radionuclides (K-40, Th-232 and U-238) and gamma radiation dose rates measured about 1 m above a kaolinitic terrain in Ifonyintedo, Dahomey Basin, SW Nigeria. Nineteen (19) data points were randomly occupied at the lower axis of the kaolin field using a hand-held detector known as Super-Spec (RS 125). At each data point, the measurements were taken four times, while their averages and standard deviations were estimated in order to ensure accuracy. The radiometric survey was carried out between December, 2017 and January, 2018. The data sets were processed and analyzed via a descriptive statistics. The data can be explored further by estimating the radiological risks to the miners on the field, and to correlate the activity concentrations of the data with the activity concentrations of the tiles that are produced from the kaolin deposits in Ifonyintedo. Furthermore, the data from this article could be compared with other data acquired over a kaolinitic terrain across the globe.
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    Investigation of Radiation Levels in Soil Samples Collected from Selected Locations in Ogun State, Nigeria
    (2014) Usikalu MR; Akinyemi ML; Achuka JA
    Present study measured the terrestrial radiation and evaluated absorbed dose rates from primordial radionuclides 238U, 40K and 232Th in sixty soil samples collected from north, west, east and south of Ewekoro cement factory premises, Owowo village situated adjacent to the factory and Covenant University, Ogun State using the gamma ray spectrometry method. The gamma absorbed rate and annual effective dose equivalent were calculated so as to estimate the hazard index of the primordial radionuclides. Measured concentrations of radionuclides in Ewekoro cement factory soils were as follow: [232U 1.60±1.60 Bqkg−1 (east) - 2.56±0.08 Bqkg−1 (north), 232Th 44.78±1.83 Bqkg−1 (east) - 56.62±1.96 Bqkg−1 (north), 40K 261.54±12.67 Bqkg−1 (south) - 342.08±14.17 Bqkg−1 (east)] and Owowo village [232U 1.78±0.09 Bqkg−1 (east) - 2.62±0.08 Bqkg−1 (north), 232Th 50.07±1.93 Bqkg−1 (west) - 61.69±1.89 Bqkg−1 (north), 40K 244.11±13.38 Bqkg−1 (north) - 296.40±14.90 Bqkg−1 (south)]. These locations have higher concentration of all radionuclides than that of Covenant University soils, which are as follows: [232U 0.62±0.07 Bqkg−1 (south) - 1.07±0.06 Bqkg−1 (north), 232Th 30.23±1.87 Bqkg−1 (south) - 38.87±1.78 Bqkg−1 (east), 40K 243.35±12.57 Bqkg−1 (south) - 301.15±13.55 Bqkg−1 (north)]. The mean absorbed dose and annual equivalent effective dose is 40.88 nGyr-1 and 0.05 mSv respectively. The study found that the activity concentrations and radiological hazard index from samples from Ewekoro and the neighbourhood are consistently higher than those from Covenant University however; the values are less than the recommended safe levels.