Browsing by Author "Sarki, M.U."

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    Background Gamma Radiation Measurement Of Market Places In Keffi, Nasarawa State, Nigeria.
    (Department Of Library And Information Science, Faculty Of Education, Nasarawa State University, Keffi., 2021-06-05) Sarki, M.U.; Ma'aji, U.M.; Iliya, M.M.; Isah, S.H.; Wada, H.M.; Ahmed, I.
    In this study, the assessement of background gamma radiation measurement of market places in Keffi Nasarawa State, Nigeria has been conducted. An in-situ measurement of background gamma exposure rate count per minute for twenty locations from two market (ten measurement each) was done using a well calibrated portable halogen-quenched Geiger Muller (GM) detector (Inspector alert nuclear radiation monitor SN: 3544) at an elevation of 1.0 m above ground level with a Global Positioning System (GPS) for geographical locations. Using an established radiological relations, the radiological health hazards were evaluated using the measured background gamma exposure rates. The values obtained were compared with recommended limits set by ICRP and UNSCEAR to ascertain the radiological hazard status of the environment. The mean values of the background gamma exposure levels (0.0869 mRh'1), absorbed dose rates (756.03 nGyh'1) and excess lifetime cancer risk (3.245x 1 O'3) are higher than their recommended safe limits of 0.013 mRh'1, 84.0 nGyh'1, 0.29x10’3 respectively as recommended by UNSCEAR and ICRP. The mean Annual Effective Dose Equivalent (AEDE) (0.927 raSvy'1) is lower than the recommended permissible limits of 1.00 mSvy'1 for general public exposure and also the effective doses to different body f organs are all below the recommended limits of 1.0 mSvy'1. Generally, the study shows that market places • in Keffi, Nasarawa State is relatively safe radiologically with little contamination which could be attributed C to the to human activity and partly due to geological formation of the market places. However, the contamination will not pose any immediate radiological health effect on resident of the area but there is tendency for long-term health hazards in the future such as cancer due to doses accumulated.
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    Gravitomagnetic Coupling in a Weak Field Approximation
    (Department of Physics, Nasarawa State University Keffi, 2019-06-12) Sarki, M.U.; Ewa, I.I.; Mustapha, I.M.; Yusuf, M.A.; Isah, S.H.
    According to general relativity, a moving or rotating matter should produce contribution to the gravitational field which is in analogy to the magnetic field of a moving charge or magnetic dipole; we can thus express the general relativity in a Maxwellian structure with the existence of single operator for both fields. In this research work, we studied the coupling of Maxwell's dynamical theory of electromagnetism in a non-static gravitational field by applying an obtained gravitational scalar potential to the Riemann's laplacian operator. In the limit of weak gravitation, we obtained the dynamical gravitomagnetic scalar potential across the fields. While in the boundary conditions the results are generalized gravitomagnetic potential. our results will thus widen the scope into study of gravitomagnetic coupling.
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    Lineaments Analysis and Interpretation for Assessment of Groundwater Potential of Lafia and Environs, North Central Nigeria
    (Department of Geology and Minning, Nasarawa State University Keffi, 2019-02-01) Ma'aji, U.M.; Maina, M.B.; Sarki, M.U.
    This work was carried out to investigate the groundwater potentials of Lafia and environs using lineaments analysis. It studied the relationship between the characteristics and occurrence of groundwater in aquifers ranging from 50m-150m depth in the varying sedimentary rocks of the area by examining the possibility of groundwater occurrence in the different sedimentary rocks, despite the general understanding that shales are less porous and permeable. It shows the use of LANDSAT ETM+ imagery and geological map to investigate areas favourable for groundwater development. This was achieved by plotting the lineament trends, and lineament density to know the groundwater potentials. Rose (azimuth-frequency) diagram of the lineaments delineated on the imagery shows the trends in the directions N-S, NE-SW and NW-SE. The two dominant trends are N-S and NW-SE. The analyses have shown that the study area has numerous fractures whose major trends are mainly in north-south and northwest-southeast directions. Lineament density maps shows the cross-cutting lineaments are relatively high in the areas around the north-eastern south-western parts of the study area but low in the other areas. The zones of high lineament intersection density are feasible zones for groundwater prospecting.