ABSTRACT The Entrance Skin Dose (ESD) for common radiographic examinations of forty (40) patients was measured prospectively at the Benue State University Teaching Hospital, Makurdi using LiF thermo-luminescent dosimeter (TLD) chips. The examination comprised ten (10) patient’s each of chest, abdomen, pelvic and lumbar sacral regions.The mean ESDs obtained by LiF TLD for Chest X-ray (PA), Plain Abdomen, Lumbar Spine (AP) and Pelvic (AP) were 0.50 mGy, 0.20 mGy, 0.80 mGy, 0.70 mGy respective...
ABSTRACT Solar radiation data at horizontal level, tilted surfaces and in the atmosphere is an important feature in solar energy applications such as photovoltaic systems for electricity generation, solar collectors for heating and passive solar devices. This study presents an investigation of the dependence of global solar radiation incident on a tilted surface on some meteorological parameters for different tilt angles based on measured meteorological data of sunshine, relative humidity and...
ABSTRACT Solar radiation data at horizontal level, tilted surfaces and in the atmosphere is an important feature in solar energy applications such as photovoltaic systems for electricity generation, solar collectors for heating and passive solar devices. This study presents an investigation of the dependence of global solar radiation incident on a tilted surface on some meteorological parameters for different tilt angles based on measured meteorological data of sunshine, relative humidity and...
ABSTRACT Biomass is the major energy source in Nigeria contributing about 78% of Nigeria primary energy supply. In this work a comparative analysis of the heating values of saw dust, rice husks, and coconut shell in the thermal generation of electricity was carried out. In the study different masses of biomass were used and the corresponding electromotive force in millivolts obtained. A graph of e.m.f was plotted against mass of each biomass and a gradient was obtained. Bar graphs were plotte...
Recent geophysical surveys have reported presence of iron ore deposits within Meru County. It has been speculated that there could be more deposits within the region. Ground magnetic surveying was used to detect magnetic rocks within host formations in Kindani area of Maua. A fluxgate magnetometer was used to measure the vertical component of the Earth’s magnetic field in some 98 stations, covering an area of about 25 km2. Diurnal and geomagnetic corrections were then done on the data. A co...
Naturally occurring radioactivity has existed in our environment since the creation of the earth. Uranium, thorium and potassium radionuclides are relatively abundant in rocks and soils. Poor agricultural practices such as excessive use of fertilizers also lead to accumulation of radioactive elements in the soil. Due to their radiation, these radionuclides pose exposure risks which could lead to health related problems like cancer to the people exposed. There is therefore a growing concern on...
Nickel doped tin oxide and tin monoselenide thin films were coated using spray pyrolysis. Nickel doped tin oxide Precursor solution was prepared using a 0.05M Tin (II) Chloride (SnCl4.2H2O) and 0.05M Nickel chloride 6-hydrate (NiCl2.6H2O) in de-ionized water and then being added in ethanol in the ratio 1:1 to get equal proportions, followed by about 2-3 drops of hydrochloric acid. Doping tin oxide was done using uniform concentration of (NiCl2.6H2O) of 0-10 %. Precursor solution of tin sele...
The geology of Magaoni area is associated with the presence of heavy minerals. Magaoni neighbours Maumba and Nguluku where ilmenite was discovered by Tiomin Resource Inc. in1996, using drilling and chemical analysis. Ilmenite mineral is known to be magnetically weak, but provides observable magnetic response. In this study, ground magnetic survey method was carried out to map magnetic anomalies of established stations, associated with ilmenite bearing formations. Energy Dispersive X-R...
In this study, the tectonic lineaments and permeability around Homa Hills geothermal prospect, Nyanzian rift were investigated in order to explore its geothermal potential using ground magnetic method. A proton-precession magnetometer model G-856 of accuracy of ±0.1nT was used to take total magnetic field intensity of the earth at every station. A total of 86 magnetic stations were established over an area of about 76km2. The magnetic data at each station was corrected for both diurnal varia...
Natural radioactivity levels and radiation risks due to construction sand mined from Tharaka region of Tharaka-Nithi County in Kenya has been measured. The region is mostly rocky with majority of rocks being volcanic rocks and sedimentary rocks of volcanic origin; the area is occupationally characterized by sand mining for construction purposes within the County and also in some parts of the neibouring Meru and Embu Counties. The sand is mined along the river banks and also gullies that carry...
Elastic electron-atom collision data from experimental and theoretical studies is useful in the interpretation of spectra obtained in X-ray photoelectron spectroscopy and Auger electron spectroscopy as well as in the Monte Carlo simulation of conduction electrons in solids. In principle the behaviour of an electron-atom collision system is predicted by solving the Schrödinger equation. However this task is far from simple in that the equation can only be solved exactly for a two-body co...
ABSTRACT STEM Subjects and specifically Physics plays a major role in national development its knowledge is crucial in the manufacturing, healthcare and housing industries. This therefore calls for proper acquisition of knowledge and skills in the subject. However, the performance in the subject is low. The purpose of the Study was to establish the use of Learner- centered teaching methods to improve performance of Physics in Migori County. The main objectives of the study were; a) To estab...
ABSTRACT Lanthanum Fluoride (LaF3) has several applications for instance, in electrodes manufacture, fluorescent lamps and fiber optic devices due to its high heat capacity. Barium fluoride (BaF2) is an alkaline-earth element with a wide band gap with many optical applications, such as lithography. BaF2 has been established as an excellent candidate that is useful for hosting optically active centers (OAC).Lanthanide elements have been used as dopants in BaF2 lattice to achieve the desired o...
Abstract The focus of the researchis to investigate the advantages of biomass as an alternative energysource to prevent or reduce the additional emissions of greenhouse gases; that is released from the conventional fuels combustion. A studyalso put a spot of light on the potentialof different sources which can produce good amount of biomass as fuelfeed stock.It is clear that biomass can be used as an alternative source of energy if the mentioned recommendations are done.
ABSTRACT The activity concentration of radon in geothermal waters from Homa mountain region of south-western Kenya has been measured. Homa mountain is one of the regions in Kenya with elevated background radiation. This region is covered with geothermal grass and has some cold and hot springs. The activity concentration of radon in spring waters, river waters and pond waters from (i) geothermally active HBRA (ii) non-geothermally active HBRA and (iii) non-geothermally active non-HBRA areas of...