Environmental Science, Physics and Astronomy, Geophysics, Atmospheric Science
11
Scopus Publications
351
Scholar Citations
10
Scholar h-index
10
Scholar i10-index
Scopus Publications
Interpretation of airborne radiometric data of flamingo field, Southwestern Nigeria T. O Lawal, O. Fawale, J. A. Sunday, G. B. Egbeyale Journal of the Nigerian Society of Physical Sciences, 2025 The airborne radiometric data of the Flamingo Field, Southwest Nigeria has been analyzed and interpreted with the aim of evaluating the surface geology and structural features that are critical for mineral resource exploration. The objectives of the study are to delineate the alteration zones by correlating interpreted data with the lithological units, and to describe the relationship between the airborne radiometric anomalies and the subsurface structural trends. To achieve this, the data was subjected to rigorous qualitative and quantitative interpretation. Maximum and minimum concentration values for Total count (TC (Unit of radiation (Ur)) rate, Potassium (K %), equivalent of Thorium (eTh) and that of Uranium (eU) were estimated. The results of the study show that the value of Ur, K, eTh%, and eU in Flamingo Field range from 2.408 to 41.017, 0.162 to 3.238 (%), 0.846 to 33.104 (ppm) and 0.169 to 7.232 (ppm), respectively. Locations of the associated anomalies which serve as alteration zones were obtained and values obtained from this expression clearly reveals that majority of the rock units for most of the radio elements in the area are below one hundred percent, while few others such as carbonaceous/slate phyllite, meta siltstone, undifferentiated schist and granite gneiss have values above 100%, especially for potassium and thorium elements. Also, the produced composite radioelements and image maps reveals bright some zones within the field which is a revelation of anomalous alteration zones. More so, the most prominent trend in the field correspond to the Northeast -- Southwest and Northwest -- Southeast directions which plays an important role in the structural framework of the study area.
Level and Potential Radon (222Rn) Radiation Risk in Groundwater Samples at Jimba-Oja, Northcentral Nigeria Jordan Journal of Physics, 2024 Radon (222Rn) concentration in groundwater was investigated using the Rad7 detector. This investigation was necessary due to the impact of a new mining company in Jimba-Oja, which may affect the surface water supply, potentially percolating into subsurface water sources. Nine (9) samples were collected from hand-pump wells and analyzed in the laboratory. The estimated radon concentration ranged from 3.08 Bq. L-1 to 9.18 Bq. L-1 with an average value of 5.00 BqL-1. The average AED for groundwater ingestion by adults, children, and infants was calculated at 36.50, 54.75, and 63.88 μSv.y^(-1), respectively. The average AEDtotal values were 162.50 μSv.y^(-1) for adults, 180.75 μSv.y^(-1) for children, and 189.88 μSv.y^(-1) for infants. The results indicate that the AED for infants exceeds the permissible limit of 100 μSv.y^(-1), while the values for children and adults remain within the recommended limit of 200 μSv.y^(-1). Thus, the health risk from radiological exposure is within allowable limits for children and adults but poses a potential risk for infants. Although 222Rn concentrations in groundwater samples are low, are currently low, there may still be probabilistic effects on local inhabitants over time. To monitor 222Rn levels, we recommend repeating these measurements in the same wells and season within the next two years to ensure consistency and detect any changes in radon levels. Keywords: Radon (222Rn) concentration, Groundwater, Jimba-Oja, Dose rate.
Mapping and Delineation of Hard Rock Aquifers in Parts of the South-western Nigeria Basement Complex Using Integrated Geophysical Techniques A. A. Fatoyinbo, T. O. Lawal, A. Yussuf, O. Fawale Jordan Journal of Physics, 2022 An integrated geophysical survey involving three different techniques; namely, VLF-EM, Seismic Refraction and Vertical Electrical Sounding (VES) has been carried out in parts of Eruwa, Ibarapa East LGA, Oyo State with a view of determining the structural characteristics of the subsurface geology and identifying suitable sites where viable borehole could be sited to reduce the problem associated with acute shortage of groundwater in the area. The area lies within the crystalline basement rock terrain of South-Western Nigeria and bounded by Latitude 7° 32' 59"N and Longitude 3° 25' 59"E. The VES results reveal that the area is made up of four major lithologic layers with the topmost layer being majorly laterites, the second layer being sandy clay, the third is weathered basement, while the fourth layer is fractured basement. The aquifer in the study area is mostly confined with curve responses of HA- and HKH-types. The 2-D pseudosection also showed that the fresh basement is very extensive laterally with undulating topography. The result of VLF-EM revealed high-amplitude anomalies. These anomalies are indicative of high conductive zones within the basement bedrock of the study area. The results of the seismic inversion reveals three lithologic layers; namely, the topmost layer / topsoil which is sandy (moderately loose) with an average velocity of 500 m/s, the middle layer can be sandy clay/laterite/caked clay with an average velocity of 1,149.33 m/s and the third layer can be said to be the beginning of the weathered/fresh basement with a velocity of 2,719 m/s. In conclusion, the three geophysical techniques have shown that the area is a hard-rock terrain with complicated geology with aquifers confined and the water bearing formation with low total longitudinal conductance. Keywords: Basement terrain, Granitic masses, Aquifer, Topography, Curve types.
Detection of Concealed Mineral Deposits using Magnetic Data in part of Osun State and its Environs, South-western Nigeria T.O. Lawal, D.M. Omar, M.K. Salami, T. Adewumi, J.A. Sunday, et al. Iop Conference Series Earth and Environmental Science, 2021 Magnetic data of part of Osun State and its Environs, Southwestern Nigeria has been studied with the aim of identifying structures concealing mineral deposits through some enhancement techniques. These techniques are Analytic signal, Euler deconvolution, Center for exploration targeting and porphyry analysis. In this work we were have applied Analytic signal to identify edges and distribution of magnetic sources that are equivalent to concealed mineral deposits, Euler deconvolution was used to identify and estimate depth to various magnetic source geometries using prescribed structural indices of 0.0, 1.0 and 2.0 respectively and lastly, the center for exploration targeting and porphyry analysis was used to obtain magnetic lineaments and porphrytic intrusives that may serve as structures concealing mineral deposits. From this study, we were able to identify several volcanic intrusions which appeared beyond surface exposure and at the same time of Cenozoic era. These intrusions resulted from the high magnetic content which serves as a contributing factor for the presence of positive magnetic anomalies in the area. In conclusion, we have been able use magnetic data of Osun State and its environs to delineate structures concealing mineral deposits.
Depth Estimate and Mapping of source geometries from High Resolution Aeromagnetic (HRAM) data of Benisheikh, Nigeria T.O. Lawal, J. A. Sunday, L.I. Nwankwo, M.M. Orosun, K. A. Yusuf, et al. Iop Conference Series Earth and Environmental Science, 2018 Depth to magnetic basement and mapping of source geometries were estimated from High Resolution Aeromagnetic (HRAM) data of Benisheikh using wavelet transformation technique. This technique was chosen because it has been proven to be a powerful and efficient tool in interpreting potential field data. In this work, a non-orthogonal wavelet function with a good symmetry and higher vanishing moment, Morlet was chosen as the analyzing wavelet. Wavelet power spectrums of the aeromagnetic anomalies were obtained using the scaled normalized analyzing wavelet in order to estimate the depth to the magnetic basement. Also, the square of the absolute value of the wavelet coefficient were plotted against the period in other to identify and map variations of pronounced and least energy values which can be regarded as magnetic source geometric features found from the HRAM data profiles. The results obtained from the analysis have shown the ability of wavelet transform as a tool in depth estimation and mapping of geological features of HRAM data of this part of Nigeria.
Radiological Safety of Water from Hadejia River M. M. Orosun, A. B. Alabi, A. O Olawepo, R. O. Orosun, T. O. Lawal, et al. Iop Conference Series Earth and Environmental Science, 2018 Water samples from Hadejia River in the north eastern part of Nigeria were studied in order to ascertain the suitability and radiological safety of water from the river for human consumption. Radioactive measurements, using a lead shielded sodium iodide detector coupled to a multichannel analyzer were used to estimate eight radiological parameters of water samples from Hadejia River. The results show that the values of all the parameters fall within the minimum universal standard, indicating that consuming the water pose no serious radiological hazard, especially for adults. The values of the Absorbed Dose Rate (50.10511 nGyh-1) and AEDE (12.458 mSvy-1) for the infant however portend that infant consumer could be susceptible to radiation hazard on consuming water from the River. It is however recommended that activities that are capable of enhancing the radiological content of the River be avoided within the area.
Analysis of rainfall data of Ikeja, southwestern Nigeria, using wavelet transform African Review of Physics, 2017
Wavelet analysis of aeromagnetic data of Chad basin, Nigeria African Review of Physics, 2015
RECENT SCHOLAR PUBLICATIONS
APPLICATION OF B3Y-FETAL EFFECTIVE INTERACTION ON CLUSTER RADIOACTIVITY. WA Yahya, JT Majekodunmi, KJ Oyewumi, SA Bello, TO Lawal Acta Physica Polonica B 57 (1), 1 , 2026 2026
Radiogenic heat potential evaluation of Apomu, Southwest Nigeria: implications for renewable energy improvement and exploration TO Lawal, O Fawale, JA Sunday, GB Egbeyale, SO Issa JOURNAL OF BASICS AND APPLIED SCIENCES RESEARCH 1 (1), 51-56 , 2025 2025
Interpretation of airborne radiometric data of flamingo field, Southwestern Nigeria. TO Lawal, O Fawale, JA Sunday, GB Egbeyale Journal of Nigerian Society of Physical Sciences 7 (1) , 2025 2025 Citations: 2
Delineation of structural features and hydrothermal alteration zones using integrated geophysical data of part of North-central Nigeria T Lawal, O Dahir, F Oluwakorede, AJ Sunday Proceedings of the Nigerian Society of Physical Sciences, 83-83 , 2024 2024 Citations: 1
A Geo-Electrical Survey for Groundwater Exploration in a Part of the Basement Complex Terrain, Ilorin Metropolis Northcentral Nigeria O Fawale, TO Lawal, JS Abayomi Nigerian Journal of Physics 32 (2), 55-65 , 2023 2023 Citations: 1
Assessment of activity concentrations of radioactive elements in selected groundwater samples of Kwara State Polytechnic and its environs, North Central Nigeria TO Lawal, SJ Abayomi, O Fawale Recent Advances in Natural Sciences, 6-6 , 2023 2023 Citations: 1
Groundwater potential mapping in hard rock terrain using remote sensing, geospatial and aeromagnetic data KS Ishola, AA Fatoyinbo, AI Hamid-Mosaku, CJ Okolie, OE Daramola, ... Geosystems and Geoenvironment 2 (1), 100107 , 2023 2023 Citations: 57
Mapping and Delineation of Hard Rock Aquifers in Parts of the South-western Nigeria Basement Complex Using Integrated Geophysical Techniques AA Fatoyinbo, TO Lawal, AH Yussuf, O Fawale Jordan Journal of Physics 15 (3), 247-258 , 2022 2022 Citations: 2
Geosystems and Geoenvironment KS Ishola, AA Fatoyinbo, AI Hamid-Mosaku, CJ Okolie, OE Daramola, ... 2022
Delineation of Horizontal Locations and Estimation of Depth to Magnetic Source Geometries of Dubumbali, North-East Nigeria TO Lawal, JA Sunday, SO Issa, O Fawale, LI Nwankwo Physics Memoir-Journal of Theoretical & Applied Physics 3 (1), 25-37 , 2021 2021
Detection of concealed mineral deposits using magnetic data in part of Osun state and its environs, south-western Nigeria TO Lawal, DM Omar, MK Salami, T Adewumi, JA Sunday, O Fawale IOP Conference Series: Earth and Environmental Science 655 (1), 012074 , 2021 2021 Citations: 5
Use of Magnetic anomaly data to delineate subsurface structures and depth characterization of Lafiagi and its environs, Northcentral Nigeria TO Lawal, J Sunday, korede Fawale, M Salami, T Adewumi NRIAG Journal of Astronomy and Geophysics 10 (1), 155-167 , 2021 2021 Citations: 8
Bacteriological Analysis of Water, From Multiple Sources in Omupo, Kwara State M Otuyo, A Ahmed, MO Osinubi, TO Lawal, AK Ahmed Ilorin Journal of Science 7 (2), 227-235 , 2020 2020
Integrated aeromagnetic and aeroradiometric data for delineating lithologies, structures, and hydrothermal alteration zones in part of southwestern Nigeria TO Lawal Arabian Journal of Geosciences 13 (16), 775 , 2020 2020 Citations: 42
Geo-electrical evaluation of aquifer characteristics and groundwater potential in Sango-Kulende Area, Ilorin, Nigeria O Fawale, LI Nwankwo, OI Oladipo, TO Lawal Journal of Applied Sciences 1 (1) , 2020 2020 Citations: 5
Geothermal Energy Potential of the Chad Basin, North-Eastern Nigeria. TO Lawal, LI Nwankwo, AA Iwa, JA Sunday, MM Orosun Journal of Applied Sciences & Environmental Management 22 (11) , 2018 2018 Citations: 9
Depth Estimate and Mapping of source geometries from High Resolution Aeromagnetic (HRAM) data of Benisheikh, Nigeria TO Lawal, JA Sunday, LI Nwankwo, MM Orosun, KA Yusuf, SO Ige IOP Conference Series: Earth and Environmental Science 173 (1), 012034 , 2018 2018 Citations: 1
Radiological safety of water from Hadejia River MM Orosun, AB Alabi, AO Olawepo, RO Orosun, TO Lawal, SO Ige IOP Conference Series: Earth and Environmental Science 173 (1), 012036 , 2018 2018 Citations: 21
Depth Estimate and Mapping of source geometrics from High Resolution Aeromagnetic (HRAM) data of Beisheikh, Nigeria SO Lawal, T. O., Sunday, J. A, Nwankwo, L. I, Orosun, M. M. Yusuf, K. A & Ige An Appraisal Proceedings of International Conference on Science and … , 2018 2018
Characteristics of ionospheric minimum frequency obtained by DPS-4 digisonde and comparison with IRI-D-region electron density over Jicamarca station KA Bello S. A., Lawal T.O., Orosun M. M., Ige S. O., Adebanjo G. D. & Yusuf Ilorin Journal of Science. 2 (1), 1 - 12 , 2017 2017 Citations: 4
MOST CITED SCHOLAR PUBLICATIONS
Groundwater potential mapping in hard rock terrain using remote sensing, geospatial and aeromagnetic data KS Ishola, AA Fatoyinbo, AI Hamid-Mosaku, CJ Okolie, OE Daramola, ... Geosystems and Geoenvironment 2 (1), 100107 , 2023 2023 Citations: 57
Assessment of heavy metal pollution in drinking water due to mining and smelting activities in Ajaokuta, Nigeria MM Orosun, P Tchokossa, LI Nwankwo, TO Lawal, SA Bello, SO Ige Nigerian Journal of Technological Development 13 (1), 31-39 , 2016 2016 Citations: 45
Integrated aeromagnetic and aeroradiometric data for delineating lithologies, structures, and hydrothermal alteration zones in part of southwestern Nigeria TO Lawal Arabian Journal of Geosciences 13 (16), 775 , 2020 2020 Citations: 42
Natural radionuclide concentrations and radiological impact assessment of soil and water in Tanke-Ilorin, Nigeria MM Orosun, TO Lawal, FC Akinyose Zimbabwe Journal of Science & Technology 11, 158-172 , 2016 2016 Citations: 38
Evaluation of the Depth to the bottom of magnetic sources and Heat flow from High Resolution Aeromagnetic (HRAM) Data of part of Nigeria sector of Chad basin. LI Lawal, T. O & Nwankwo Arabian Journal of Geosciences 10 (378), 1 -12 , 2017 2017 Citations: 28
Radiological safety of water from Hadejia River MM Orosun, AB Alabi, AO Olawepo, RO Orosun, TO Lawal, SO Ige IOP Conference Series: Earth and Environmental Science 173 (1), 012036 , 2018 2018 Citations: 21
Wavelet analysis of aeromagnetic data of part of Chad basin, Nigeria. CO Lawal, T. O., Nwankwo, L. I. & Akoshile The African Review of Physics. 10 (16), 111 - 120 , 2015 2015 Citations: 20
Natural Radionuclide Concentration and Radiological Impact Assessment of Soil and Water from Dadinkowa Dam, Northeast Nigeria G Orosun, M. M., Lawal, T. O., Ezike, S. C., Salawu, N. B., Atolagbe, B. M ... Journal of the Nigerian Association of Mathematical Physics 42 (1), 307 - 316 , 2017 2017 Citations: 16
Evaluation of Groundwater Potential and Subsurface Lithologies in Unilorin Quarters using Resistivity Method TO Olawepo, A.O., Fatoyinbo, A.A., Ali, I. & Lawal The African Review of Physics. 8 (45), 317 - 323 , 2013 2013 Citations: 16
Impact of VES in delineation of groundwater distribution and exploration in hard rock terrain TO Lawal, JA Sunday, O Fawole Int. J. Adv. Phys 4 (1), 30-35 , 2012 2012 Citations: 10
Geothermal Energy Potential of the Chad Basin, North-Eastern Nigeria. TO Lawal, LI Nwankwo, AA Iwa, JA Sunday, MM Orosun Journal of Applied Sciences & Environmental Management 22 (11) , 2018 2018 Citations: 9
Use of Magnetic anomaly data to delineate subsurface structures and depth characterization of Lafiagi and its environs, Northcentral Nigeria TO Lawal, J Sunday, korede Fawale, M Salami, T Adewumi NRIAG Journal of Astronomy and Geophysics 10 (1), 155-167 , 2021 2021 Citations: 8
Application of 3-D Euler Deconvolution Technique to Aeromagnetic Data of Ilorin and Osi, North central Nigeria I Lawal, T. O., Salawu, N. B., Orosun, M. M., Ekpumoh, J. I. and Nwankwo, L Zimbabwe Journal of Science & Technology 11, 66 - 75 , 2016 2016 Citations: 7
Detection of concealed mineral deposits using magnetic data in part of Osun state and its environs, south-western Nigeria TO Lawal, DM Omar, MK Salami, T Adewumi, JA Sunday, O Fawale IOP Conference Series: Earth and Environmental Science 655 (1), 012074 , 2021 2021 Citations: 5
Geo-electrical evaluation of aquifer characteristics and groundwater potential in Sango-Kulende Area, Ilorin, Nigeria O Fawale, LI Nwankwo, OI Oladipo, TO Lawal Journal of Applied Sciences 1 (1) , 2020 2020 Citations: 5
Geophysical Investigation of Groundwater Contamination in a Solid Waste Disposal Site LA Lawal, T. O, Orosun, M. M, Ige, S. O, Sunday, J. A, Shehu, S, A, Bello, S ... Al-Hikmah Journal of Pure & Applied Sciences 5 (1), 8 - 16 , 2017 2017 Citations: 5
Characteristics of ionospheric minimum frequency obtained by DPS-4 digisonde and comparison with IRI-D-region electron density over Jicamarca station KA Bello S. A., Lawal T.O., Orosun M. M., Ige S. O., Adebanjo G. D. & Yusuf Ilorin Journal of Science. 2 (1), 1 - 12 , 2017 2017 Citations: 4
Interpretation of airborne radiometric data of flamingo field, Southwestern Nigeria. TO Lawal, O Fawale, JA Sunday, GB Egbeyale Journal of Nigerian Society of Physical Sciences 7 (1) , 2025 2025 Citations: 2
Mapping and Delineation of Hard Rock Aquifers in Parts of the South-western Nigeria Basement Complex Using Integrated Geophysical Techniques AA Fatoyinbo, TO Lawal, AH Yussuf, O Fawale Jordan Journal of Physics 15 (3), 247-258 , 2022 2022 Citations: 2
Assessment of Heavy Metal Pollution in drinking Water Due to Mining and Smelting Activities in Ajaokuta, Nieria MMOP Tchokossa, LI Nwankwo, TO Lawal, SA Bello, SO Ige Nigerian Journal of Technological Development 13 (1), 31-39 , 2016 2016 Citations: 2
