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IJSTR >> Volume 10 - Issue 2, February 2021 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Transport And Fate Of Radionuclides From A Hypothetical Repository Of Radioactive Waste In The Accra Plains

[Full Text]



Paul Essel, Dominic Otoo, Mark Amo-Boateng, Thomas Tetteh Akiti



Schist; AMBER; Fracture; Radioactive Contaminant; Accra Plains; Groundwater



Ghana has a stockpile of disused radioactive sources that need to be managed and dispose of. The Accra Plains is a probable site to host such a repository in Ghana. To evaluate the long-term safety of the proposed repository, a model of the geosphere and disposal system of a hypothetical radioactive waste repository sited in the Accra Plains, was developed using the AMBER simulation tool. After the engineered barriers of the repository deteriorate, undecayed radionuclides escape through groundwater and migrate through the geosphere. The model functions to monitor the escaping radionuclides, to mitigate its effects on humans and the environment. The model also purposes as a tool for calculation of the annual effective dose on a receptor dwelling around an abstraction borehole located at 4km, 1km and 200m down the hydraulic gradient of the hypothetical repository. Predicted results were used to assess the suitability of the site to host such a repository. Radiation exposure to the receptor is assumed to occur from abstraction and use of groundwater from the geosphere via the abstraction borehole. The groundwater is used for domestic purposes, that is drinking, and agricultural purposes, viz., watering animals and irrigation of crops. The predicted results for liquid releases in terms of the calculated peak annual effective dose in all cases were significantly lower than the International Commission on Radiological Protection (ICRP) dose constraint of 0.3mSv/y. The results thus indicate that the Accra Plains is capable to safely host a radioactive waste disposal facility for Ghana’s disused radioactive sources.



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