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Title:
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In-situ distribution coefficients and exchangeability of radiocaesium inaquatic systems
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Author(s):
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Published by:
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Publication date:
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ECN
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1996
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ECN report number:
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Document type:
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ECN-RX--96-053
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Other
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Number of pages:
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Full text:
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12
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Download PDF
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Abstract:
The overall objective of the title multidisciplinary project is toimprove both the applicability to dynamic situations and transportability
between sites of mathematical models of radionuclide transport through the
aquatic environment, by replacing the present black-box models with
functional models which incorporate fundamental scientific principles within
them. The objectives for the reporting period (1992-1995) are (1) to test the
general validity of the in-situ KD("13"7Cs)/NH"4" ion-exchange
relationship and its power to predict radiocaesium mobility in (and
remobilisation from) freshwater sediments; (2) determination of
'exchangeable' in-situ radiocaesium-KD's, in addition to 'total' in-situ
radiocaesium-KD's, by multiple extraction of the sediment with
NH"4"+solutions and subsequent preconcentration/low-background measurement
of the extracted-"13"7Cs; and (3) search for possibilities (method) to
measure the reverse rate constants of radiocaesium sorption (remobilisation)
on natural samples, to be included in kinetic models for radiocaesium
sorption. 1 fig., 3 tabs., 8 refs.
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