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Browsing by Author "Tesfaye, Tilahun (PhD)"

Browsing by Author "Tesfaye, Tilahun (PhD)"

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  • Zihon, Gizachew (Addis Ababa University, 2010-06)
    In this work it is analyzed that radon daughters are produced as free ions, but they become attached to aerosol particles at a rate depending on the aerosol concentration. Most of the attached activities for Rn-222 progeny ...
  • Asres, Melkamu (Addis Ababa University, 2010-07)
    The purpose of this project was to study and examine the applications of Compton scattering to measure bone mineral density and the relation between bone mass loss by aging and a disease called osteoporosis, which is, ...
  • Aklie, Teshager (Addis Ababa University, 2009-07)
    Soil samples were collected, in February 2009, from a farm land in Bilajig village near Gondar town North West Ethiopia. The soil samples were taken from a farm land that uses chemical fertilizers for nearly three decades ...
  • Assefa, Getahun (Addis Ababa University, 2018-09-01)
    Cosmic rays are high-energy particles coming from space that hardly ever hit the Earth's surface but interact with nuclei of air molecules, usually several tens of kilometers above ground, and many new particles are formed. ...
  • Degu, Guadie (Addis Ababa University, 2018-07-04)
    In this work, the regional deposition analysis of attached fraction of radon have been studied. So as to find the regional deposition of the inhaled activity, a fortran code is used. The parameters and the assumptions ...
  • Seid, Abdu (Addis Ababa University, 2018-07-03)
    Radon is a natural radioactive gas derived from geological materials. The greatest fraction of the natural radiation exposure in human results from inhalation of the short-lived decay products of radon (222Rn), which ...
  • Terefe, Temesgen (Addis Ababa University, 2017-06)
    Instantaneous measurements of equilibrium equivalent concentration of radon (EECRn) Counting system were taken over a period of 21 days in Nuclear physics laboratory located in the first floor of the physics building, ...
  • Asefa, Zewdineh (Addis Ababa University, 2017-10-03)
    Equilibrium equivalent concentration of thoron (EECTh)were measured in theNuclear Physics laboratory of the Addis AbabaUniversity over a period of 21 days in the months of April andMay 2017. The laboratory is located in ...
  • Bekele, Teshome (Addis Ababa University, 2019-06-04)
    Food irradiation is the processing of food products by ionizing radiation in order to control food borne pathogens, reduce microbial load and insect infestation, inhibit the germination of root crops and extend the durable ...
  • Ahmed, Nuredin (Addis Ababa University, 2010-07)
    Attenuation due to scattering or absorbtion of photons in composite materials depend basically up on two factors, the effective atomic number and electronic density of the absorber material. This project discuses recent ...
  • Teffera, Yohannes (Addis Ababa University, 2018-08-03)
    Gamma-ray spectroscopy is the chief experimental technique of atomic physics and studies the high energy photons which are characteristic of the specific initial- and final-state nuclear energy levels, from radioactive ...
  • Aman, Seid (Addis Ababa University, 2018-08-05)
    The human environment is one in which ionizing radiations are present at all times and at all places on the Earth from the deepest caves to the highest mountains and on the space. Radon and its decay products are present ...
  • Berhane, Tsega (Addis Ababa University, 2007-08)
    Suction pump was used for air to pass through a glass filter (> 90% filtration efficiency) and aerosols were deposited on it. The sampled filter was placed below a GM tube (with GM nuclear counter) within a time interval ...
  • Alemayehu, Bemenet (Addis Ababa University, 2006-07)
    Suction pump was used to pass a known volume of air through Whatman glass fiber filter (> 90 % filtration efficiency). Aerosols deposited on the filter were placed under end-window GM tube with in a minute after the end ...
  • Mengistu, Efrem (Addis Ababa University, 2006-07)
    Neutron activation analysis(NAA) is used for quantitative determination and identi cation of elements from the chemical compound and rocks samples. Copper (Cu) and Iodine (I) and thier chemical compounds (CuSO4, KIO4 and ...
  • Olani, Yobsan (Addis Ababa University, 2018-09-01)
    One of the most important tools of nuclear science is the particle accelerator. Prior to its invention in 1928, the only known sources of particles that could induce nuclear reactions were the natural alpha particle ...
  • Yacob, Kebede (Addis Ababa University, 2009-01)
    Radiation dose measurement is mainly concerned with the measurement of the amount of energy absorbed in matter, when it undergoes different interaction processes with the irradiated material. The demand of radiation ...
  • Bayissa, Tamiru (Addis Ababa University, 2011-07)
    Cheng (2003) model of the extra-thoracic respiratory tract was used to calculate the deposition efficiency of aerosols of aerodynamic diameter ranging from 0.1 m to 72 m. The model assumes the deposition in the ...
  • Kabtihyimer, Tafesse (Addis Ababa University, 2010-06)
    Since 2005 WHO played the initiative role to increase the interest of radon studies in many countries around the world. Specially, in the the 30 member countries of the Organization for Economic Co-operation and Development ...
  • Tesfaye, Yared (Addis Ababa University, 2007-08)
    Air was sampled by the use of suction pump through a glass filter (> 90% filtration efficiency) and aerosols were deposited on the glass-fiber filter. The aerosol deposited on the filter paper was placed below a GM tube ...

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