Browsing by Author "Nkwoada, U. Amarachi"

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    Radiation levels around some X-ray diagnostic centres in Owerri, Imo State, Nigeria
    (U. P., 2018-07) Amakom, M. Chijioke; Orji, E. Chikwendu; Nkwoada, U. Amarachi; Nnonah, C. Daniel; Umunnakwe, C. Miriam
    Radiation levels were measured around eight diagnostic centres in Owerri, Imo State Nigeria using a portable Geiger Muller counter model GCA-04. The measurements were taken when the radiation sources (x-ray machines) were operational and non-operational. When the machines were non-operational, the background radiation ranged from 0.63 to 1.48 mSv/yr. When the machines were operational, the radiation levels ranged from 0.82 to 24.28 mSv/yr; this adds between 0.19 to 23.14 mSv/yr to the existing background radiation. The diagnostic centres used in this work have background radiation level below the world average dose limit of 2.16 mSv/yr for natural background radiation. Seven centres had annual dose rates that were below the 1.25mSv/yr dose limit for the public when the radiation source is not on and only one centre had a value still below the dose limit for the public when the radiation source was on. The other centres had higher values of annual dose rate when the safety of the general public is considered both for the cases when the radiation source was operational and non-operational.
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    Radionuclide concentration: The coal ash effect
    (Academic Journals, 2018) Amakom, M. Chijioke; Orji, E. Chikwendu; Iroegbu, Chinedu; Eke, C. Benedict; Nkwoada, U. Amarachi; Madu, D. Afam; Ugochuwu, G. Kosisochukwu; Oforma, J. Tochukwu
    Radionuclide concentrations in coal ash, soil mixed with coal ash and soil were determined using the gamma spectroscopic method. The average activity concentrations of 226Ra, 232Th, and 40K in coal ash samples were found as 35.0, 5.8, and 109.4 Bq/kg, respectively. The average activity concentrations of 226Ra, 232Th and 40K in soil mixed with coal ash samples varied from 21.2 to 30.8, 48.6 to 82.7, and 162.5 to 180.1 Bq/kg, respectively. The activity concentrations of radionuclides from the non-mixed soil area, which serves as a control to this study ranged from 123.95 to 128.82, 16.33 to 18.38, and 46.63 to 50.30 Bq/kg, respectively for radionuclides 40K, 226Ra, and 232Th, respectively. From the radiological calculations, it was found that the use of coal ash as a soil additive contributed slightly to the radionuclide concentrations of the area under study.