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Speciation Gamma-Sp...
Speciation Gamma-Spectrometry : the Fate of Environmental Radio-Nuclides in Hard-Water Lakes
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- El-Daoushy, Farid (author)
- Uppsala universitet,Fysiska institutionen
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Liger, Esperanza (author)
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- Hernández, Francisco (author)
- Uppsala universitet,Fysiska institutionen
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Casper, Peter (author)
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(creator_code:org_t)
- 2005
- 2005
- English.
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In: Physica scripta. T. - 0281-1847. ; T118, s. 35-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- A sequential fractionation method for simultaneous and absolute measurement of environmental radio-nuclides, 241Am, 210Pb, 226Ra, 137Cs, 40K and 234Th/238U, by gamma-spectrometry was tested and applied to hard-water lake-sediments. The carbonate, fulvic, humic and mineral insoluble fractions were extracted from the sediments. Correction of self-absorption and geometrical effects, arising from the conditioning of bulk and fractionated sediments, were done using Monte Carlo simulations. This "non-destructive" fractionation procedure allows further analysis of other chemical species in the same fractions thus creating possibilities to study the dynamics of self-cleaning mechanism in lakes. The results demonstrate that the procedure is quantitative and suitable for the determination of environmental key radio-tracers in different fractions. Unlike other fresh-water sediments the major part of the environmental radio-nuclides is associated with "mineral" fractions. This speciation gamma-spectrometry procedure was supplemented by isotope-dilution alpha-spectrometry 210Po (210Pb), for determining the acid-soluble organic fractions in fresh-water lakes. The overall speciation procedure demonstrated that carbonate fractions, extracted from hard-water lake sediments, could be separated either free from, or associated with, fulvic-compounds. This speciation procedure can be applied to other aquatic deposits, however supplementary steps can be added if other data are required.
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