Physics Journal
Articles Information
Physics Journal, Vol.7, No.1, Mar. 2021, Pub. Date: Aug. 20, 2021
Determination of Natural Radioactivity Level in Rock Samples from Dangote Cement Plant, Obajana, Nigeria
Pages: 5-9 Views: 82 Downloads: 31
Authors
[01] Uloko Felix Omachoko, Department of Physics, Federal University Lokoja, Lokoja, Nigeria.
[02] Agomuo John Chidowerem, Department of Physics, Nigerian Defence Academy, Kaduna, Nigeria.
[03] Ige Olumide Oluwasanmi, Department of Physics, Nigerian Defence Academy, Kaduna, Nigeria.
Abstract
To assess the possible health risk to those working, or living in the vicinity of the Dangote Cement factory Obajana Nigeria, the activity concentration of some Naturally Occurring Radioactive Material (NORMs) namely, 40K, 238U, and 232Th at the mining site of Dangote Cement Company Obajana Nigeria, was measured using a sodium iodide (NaI (Tl)) based gamma spectroscopy. Five categories of samples including the raw materials and the finished product (cement) were collected and counted for 18000 seconds. Each of the analysed sample is a mixture of the sample type collected at different locations at the site. The results show that the concentration of 40K, 238U, and 232Th in the analysed samples is between 417.25±22.28 and 1783±91.18 Bq/kg, 0.88±0.15 and 63.68±6.86 Bq/kg, and 12.90±0.75 and 29.77±1.73 Bq/kg respectively. The mean concentration of 238U and 232Th are below the recommended mean value, while that of 40K is above the world average. The radiological parameters namely, the absorbed dose rate in air, annual effective dose, calculated using the measured activity concentrations were below the recommended values. However, the mean radium equivalent activity was slightly higher than the world average, due to high activity concentration of 40K in some of the samples. This does not pose any immediate danger; hence, we conclude that there is no radiological risk to workers at the site.
Keywords
Cement, Detector, Gamma-ray, Obajana, Specific Activity
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