This paper presents an assessment of background radiation levels within the Niger Delta University campus, Bayelsa State Nigeria. A portable Geiger-Muller tube (Radiation Alert) was used to detect the background ionizing radiation within a temperature range of -100 â„ƒ to 500 â„ƒ. Results of absorbed dose rate in air in the main campus, open field and new campus varies from 104.4 nGy/h to 278.4 nGy/h with an average of 156.6 nGy/h, 34.8 nGy/h to 174.0 nGy/h with an average of 95.7 nGy/h and 69.6 nGy/h to 174.0 nGy/h with an average of 113.1 nGy/h respectively. The annual effective dose estimates ranged from 0.160 mSv/y to 0.427 mSv/y with an average of 0.024 mSv/y, 0.053 to 0.267 mSv/y with an average of 0.147 mSv/y and 0.107 to 0.267 mSv/y with mean 0.173 mSv/y in the main campus, open field and new campus respectively. The excess lifetime cancer risks ranged from 0.442 to 01.174 x 10-3 with a mean of 0.663 x 10-3, 0.146 to 0.736 x 10-3 with an average of 0.405 x 10-3 and 0.295 to 0.736 x 10-3 with average 0.479 x 10-3 in main campus, open field and new campus respectively. The estimated averages of absorbed dose rates in the air within Niger Delta University were above the world average of 57 nGy/h. Annual Effective Dose Equivalent (AEDE) are below the safe limit of 1 mSv/y for humans. The results of this study provide baseline information on the background ionizing radiation and can be referenced for future works in the area.
Magnetic measurements, mineralogical and geochemical studies were carried out on surface soil samples in order to delineate susceptibility distribution and to find possible relationships based on paleomagnetic implications in some part of Kalambaina Area of Sokoto Northwestern Nigeria. Geomorphologically, this area is generally gentle, with occasionally tabular, capped
by resistance laterites. Elevation generally decreases towards the northwest around the Nigeria
- Niger Republic boarder with an average elevation of about 215 above mean sea level. A total of 90 sample were measured at random with DSM-10 susceptibility Kappa metre as well
20 core drilling samples were collected for further XRF geochemical analysis. Mass specific susceptibility value ranges between 11.2 Ã— 10^-6 SI and 1.4 âˆ’ 8.2 Ã— 10^-6 SI and magnetic remanence at 1 T values range between 10 Ã— 10^-6 SI and 0.5 âˆ’ 9.0 Ã— 10^-6 SI as well as 0.5 âˆ’ 7.4 Ã— 10^-6 SI. Chemical analysis by Xray Fluorescence analysis revealed the presence concentration of various elements with their percentage composition (%) and the percentage composition of calcium carbonate (CaCO3) content between > 40% and < 70%, > 70% and < 80%, core drilling depth and overburden thickness of a limestone Layer and Overburden. Has also revealed low- and high-grade calcium carbonate CaCO3content.
High-resolution aeromagnetic data over a part of Ageva fault zone in Nigeria have been
analyzed with a view to estimate sedimentary thicknesses within the studied area. The data set
of this study area, was subjected to various corrections and interpretation techniques. Regionalresidual correction was done and the noise level of the data was reduced via upward
continuation to a height of 250 m thereby enhancing the reliability of the results obtained. Qualitative interpretation techniques which include: Second Vertical Derivative, Analytic Signal, Tilt derivative were used to delineate the trending pattern of the anomalies in the study
area which are in the E-W, NE-SW, NW-SE, and N-S directions. The result suggests that fault zone within Ageva and Owo may be mineralized and also that the faults within Ageva and Ibilo
extend by a quarter of their exposed length. The Werner solutions revealed that inferred faults within Owo and Ibilo may have relatively low susceptibilities as compared with others in the
study area and the range of the depth extent of linear features is 401.5 m â€“ 982.5 m.