An integrated model for the risk assessment is developed for
abandoned radioactive logging sources (Am-241 and Cs-137) in
Nigerian oil wells. The model is composed of four components:
Source term, Barrier failure model, a geosphere model, a biosphere
model, and finally a dose and health effect model to analyse the
radionuclide dispersion phenomenon from the abandoned source term
to the risk of serious health effects on members of the public
(cancer death). In addition to time-dependent annual release rate
and dose rate for each radionuclide, the ultimate risk in terms of
cancer death rate is estimated. The results show that the highest
value of the annual dose for the abandoned radioactive logging
sources is less than the individual dose limit to the human body,
and the calculated highest cancer death rate is much lower than
that of background radiation but higher than that of low-level
waste repository. It is concluded that the use of simplified
mathematical modelling for the risk assessment of abandoned
radioactive sources in oil wells could be an effective tool for
development of efficient and acceptable abandonment procedure.
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