A5050490066- Radioactivity and Radon Measurements
- Nuclear and radioactivity studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Radiation Dose and Imaging
- Particle physics theoretical and experimental studies
- Heavy metals in environment
- Neutrino Physics Research
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Water Quality and Pollution Assessment
- Geochemistry and Geologic Mapping
- Heavy Metal Exposure and Toxicity
- Radiation Detection and Scintillator Technologies
- Radiation Shielding Materials Analysis
- Muon and positron interactions and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Environmental and Social Impact Assessments
- Radioactive contamination and transfer
- Noncommutative and Quantum Gravity Theories
- Aquatic Ecosystems and Biodiversity
- Groundwater and Watershed Analysis
- Radio Astronomy Observations and Technology
- Therapeutic Uses of Natural Elements
Kenyatta University
2004-2024
University of Siegen
2006-2008
Max Planck Institute for Nuclear Physics
2005-2008
Folkwang University of the Arts
2006-2008
Max Planck Society
2005
Heavy metal pollution in surface waters has become a major worldwide issue as people tend to settle where there is readily available source of water like river. This research evaluates the causes, concentration and associated health risks heavy metals River Sosiani it passes through town Eldoret. Seven samples were collected analysed for zinc (Zn), copper (Cu) lead (Pb. The results disclosed that Pb concentrations estimated be range 0.06 mg/l 0.23 mg/l, higher than permitted limit by WHO...
Mrima Hill, located in the South coast of Kenya is known for high natural background radiation, due to presence radiogenic heavy minerals such as monazites and carbonatites. The activity concentration of 238U, 232Th and 40K soil samples from hill have been determined by gamma ray spectrometry using NaI(Tl) detector decomposition measured gamma-spectra. As a measure radiation hazard public, dose rates were also estimated. average concentrations 207.0±11.3, 500.7±20.0 and 805.4±20.0 Bqkg-1,...
Journal Article Estimation of annual effective dose due to radon and thoron concentrations in mud dwellings Mrima Hill, Kenya Get access M. W. Chege, Chege * 1Physics Department, Kenyatta University—Mombasa Campus, PO Box 16778, Mombasa, *Corresponding author: znimo@yahoo.com Search for other works by this author on: Oxford Academic PubMed Google Scholar N. O. Hashim, Hashim 2Physics University, 43844, Nairobi, A. S. Merenga, Merenga Meisenberg, Meisenberg 3Helmholtz Zentrum München—German...
Water resources are being polluted gradually by heavy metals due to continuous urbanization, industrialization and agricultural activities. This has become a major worldwide issue as people tend settle where there is readily available source of water like river. research was conducted examine metal concentrations risks in River Sosiani it passes through the town Eldoret. Samples were collected from seven points. Concentrations three metal; zinc copper lead, analysed an atomic absorption...
Human beings are continuously exposed to ionising radiation originating from natural or artificial sources. Uranium-238 and Thorium-232 found in building materials important sources of radon thoron the indoor environment. The concentration levels radon, progeny were measured mud-walled, metallic iron sheet-walled stone-walled modern houses Kilimambogo region, Kenya for 3 months. Radon using passive radon-thoron discriminative monitors (RADUET), while concentrations as equilibrium equivalent...
Heavy metal concentration (Cu, Zn, Fe, Mn, Ni) was evaluated in sediment samples of Rupingazi river during the wet and dry seasons. In this study, were collected from twenty sampling points along river. The heavy levels using Atomic Absorption Spectrphotometer.The obtained data analyzed one-way analysis variance. range copper found to be 4.68- 12.69 mg/kg for season 0.98-24.10mg/kg season. mean values iron 1422-6145.33 1254-5866.67 Nickel 0.72- 30.73 2.63-12.48 Concentration manganese...
Abstract Natural radioactive materials in certain conditions can get to hazardous radiological level. The aim of the present work was evaluate natural activity concentration from sampled building collected different locations Babadogo Estate within Nairobi City County. analysis done using gamma ray spectrometer, which put into action for spectral data acquisition and then analysis. levels 238U, 232Th 40K selected samples measured by use spectrometry method. analyzed compared with standard...
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Data from a dedicated cosmic ray run of the ALEPH detector were used in study muon trident production, i.e., pairs produced by muons. Here overburden and calorimeters are target materials while time projection chamber provides momentum measurements. A theoretical estimate cross section is obtained developing Monte Carlo simulation for propagation detector. Two candidates found to match expected pattern. The observed production rate implies that nuclear form factor cannot be neglected tridents.
Specific concentrations of (226)Ra, (232)Th and (40)K were measured in cassava tubers, leaves groundwater obtained from the high background radiation area Mrima hill used evaluation ingested dose. Cassava registered average (226)Ra 60 ± 5, 141 11 4.3 0.3 Bq kg(-1), respectively. was not detected although it present tubers as well 35.3±61.5 2.0±0.1 all samples 842±539 kg(-1) 1708 552 91.4 groundwater. The total annual effective dose due to ingestion found be 7.9 mSv y(-1) which 2.4 3.8 1.7 water.
Abstract The activity concentration of radon in underground water Bureti sub-county was measured using liquid scintillating counter device. average all the samples 12.41 Bql−1. maximum and minimum concentrations were 22.5 4.57 Bql−1, respectively. In total, 53% total analysed had levels above US Environmental Protection Agency-recommended limit 11.1 annual dose received by an individual as a result waterborne determined according to United Nations Scientific Committee on Effect Atomic...
The areas around Homa and Ruri hills in Bay County Kenya are associated with high background radiation levels. activity concentration of the natural radionuclides (226Ra, 232Th, 40K) earthen building materials used has been measured using a NaI (Tl) detector this work. values radioactivity concentrations to estimate radiological risk. material samples from registered relatively 232Th averaging 1094 ± 55 Bq/kg, nearly three times those Homa. 226Ra level was not significantly different both...
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Mixed radiation environments need unique shielding materials that can effectively attenuate photons and neutrons simultaneously. Most ordinary only shield one form of effectively. In this work, a novel composite material was fabricated in our laboratories characterized for photon neutron shielding. Waste were used as partial substitutes aggregates concrete, which is sustainable practice the building industry at present. The main components are iron filings, rubber, concrete. Concrete samples...
In this study, the activity concentration levels of 238U, 232Th, and 40K in sand samples collected from Shanzu, Nyali, Kenyatta, Tiwi, Shelly, Diani beaches selected along Kenyan coastline were determined using a gamma ray spectrometer with NaI(Tl) detector. The average concentrations analyzed as 87 ± 4, 98 1254 62 Bq/kg, respectively. Also, radium equivalent (Raeq) internal (Hin) external (Hex) hazard index calculated to assess radiological hazards associated use building materials. values...