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Books > Earth & environment > The environment > Nuclear issues
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Radionuclides in the Environment - Influence of chemical speciation and plant uptake on radionuclide migration (Hardcover, 1st ed. 2015)
Loot Price: R3,666
Discovery Miles 36 660
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Radionuclides in the Environment - Influence of chemical speciation and plant uptake on radionuclide migration (Hardcover, 1st ed. 2015)
Expected to ship within 12 - 19 working days
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This book provides extensive and comprehensive information to
researchers and academicians who are interested in radionuclide
contamination, its sources and environmental impact. It is also
useful for graduate and undergraduate students specializing in
radioactive-waste disposal and its impact on natural as well as
manmade environments. A number of sites are affected by large
legacies of waste from the mining and processing of radioactive
minerals. Over recent decades, several hundred radioactive isotopes
(radioisotopes) of natural elements have been produced
artificially, including 90Sr, 137Cs and 131I. Several other
anthropogenic radioactive elements have also been produced in large
quantities, for example technetium, neptunium, plutonium and
americium, although plutonium does occur naturally in trace amounts
in uranium ores. The deposition of radionuclides on vegetation and
soil, as well as the uptake from polluted aquifers (root uptake or
irrigation) are the initial point for their transfer into the
terrestrial environment and into food chains. There are two
principal deposition processes for the removal of pollutants from
the atmosphere: dry deposition is the direct transfer through
absorption of gases and particles by natural surfaces, such as
vegetation, whereas showery or wet deposition is the transport of a
substance from the atmosphere to the ground by snow, hail or rain.
Once deposited on any vegetation, radionuclides are removed from
plants by the airstre am and rain, either through percolation or by
cuticular scratch. The increase in biomass during plant growth does
not cause a loss of activity, but it does lead to a decrease in
activity concentration due to effective dilution. There is also
systemic transport (translocation) of radionuclides within the
plant subsequent to foliar uptake, leading the transfer of chemical
components to other parts of the plant that have not been
contaminated directly.
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