Sediment geochronology and spatio-temporal and vertical distributions of radionuclides in the Upper Bonny Estuary (South Nigeria)

• Autorzy: Omokheyeke O. , Sikoki F. D. , Laissaoui A. , Akpuluma D. , Onyagbodor P. O. , Benkdad A. , Benmansour M.
• Języki publikacji: EN

Abstrakty

EN

Surface deposits and sediment cores were collected from the Upper Bonny Estuary, located in Southwest Nigeria, and analyzed to determine spatio-temporal and vertical distributions of radio-nuclide activities expressed in Bq·kg⁻¹ dry weight. The results of activities of naturally occurring radionuclides of ²²⁶Ra (15 ± 2–34 ± 3 Bq·kg^{−1), 228}Ra (32 ± 5–48 ± 6 Bq·kg⁻¹), ⁴⁰K (264 ± 29–462 ± 36 Bq·kg⁻¹) were found to be all within the range of typical values reported for coastal regions. Ratios of ²²⁶Ra to ²²⁸Ra suggested accretion for all samples with low sediment accumulation registered during rainy months. In addition, vertical distributions at the three sampling sites were also studied with the initial aim of establishing chronologies from the decay of excess ²¹⁰Pb. In two cores, excess ²¹⁰Pb, estimated by subtracting ²²⁶Ra from total ²¹⁰Pb on a layer-by-layer basis, exhibit relatively constant activity with discrete minima and maxima. Therefore, these cores were excluded from radiometric dating. Only the third core could be dated by the constant rate of supply model, and ¹³⁷Cs was utilized to validate the ²¹⁰Pb chronology.

Słowa kluczowe

EN

Bonny Estuary; Nigeria; gamma and alpha spectrometry; 210Pb; 137Cs; sediment dating; CRS model

• Wydawca: Politechnika Śląska
• Czasopismo: Geochronometria
• Rocznik: 2014
• Tom: Vol. 41, no. 4
• Strony: 369--376
• Opis fizyczny: Bibliogr. 27 poz., wykr.

Twórcy

autor

Omokheyeke O.

• Department of Animal and Environmental Biology Faculty of Science University of Port Harcourt, Port Harcourt, Nigeria

autor

Sikoki F. D.

• Department of Animal and Environmental Biology Faculty of Science University of Port Harcourt, Port Harcourt, Nigeria

autor

Laissaoui A.

• Centre National de L’Energie, des Sciences et des Techniques Nucléaires (CNESTEN), B.P. 1382, R.P. 10001, Rabat, Morocco

autor

Akpuluma D.

• Centre for Marine Pollution Monitoring and Seafood Safety, University of Port Harcourt, Port Harcourt, Nigeria

autor

Onyagbodor P. O.

• Centre for Marine Pollution Monitoring and Seafood Safety, University of Port Harcourt, Port Harcourt, Nigeria

autor

Benkdad A.

• Centre National de L’Energie, des Sciences et des Techniques Nucléaires (CNESTEN), B.P. 1382, R.P. 10001, Rabat, Morocco

autor

Benmansour M.

• Centre National de L’Energie, des Sciences et des Techniques Nucléaires (CNESTEN), B.P. 1382, R.P. 10001, Rabat, Morocco

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