2 edition of Data to model the migration of radionuclides through the biosphere during a glacial cycle found in the catalog.
Data to model the migration of radionuclides through the biosphere during a glacial cycle
|Statement||by J.A. Elson and G.R. Webber.|
|Series||Technical record (Atomic Energy of Canada Ltd) -- 527|
|Contributions||Webber, G.R., Atomic Energy of Canada Limited.|
|The Physical Object|
|Pagination||109 p. :|
|Number of Pages||109|
Vertical profiles of Cs and , Pu were measured in soils collected from two sites in southern Sweden and three sites in southern Poland and were modeled using both a solute transport model and a bioturbation model to better understand their downward migration. A time series of measured Cs profiles indicates that Cs from Chernobyl was found at Cited by: The migration of three radionuclides namely, 60 Co, Cs and Am have been simulated using a two-dimensional finite element numerical model code (Comsol Multiphysics). Neglecting heterogeneity, simulated results showed that, all three radionuclides (60 Co, Cs, Am) within the low conductivity medium sunk steeply downward into the Cited by: 2.
During this thesis, we set out to build and test an electromigration cell and research the competition of radionuclides in the near field. The elements researched are elenium. ceasium, technetium and s Ceasium was chosen as it is a widely research elements and much data on it can be found. This data was. Assimilating atmospheric data into a terrestrial biosphere model: A case study of the seasonal cycle T. Kaminski,1,2 W. Knorr1 P. J. Rayner,3 and M. Heimann1 Received 16 July ; revised 6 March ; accepted 10 May ; published 24 October
During glacial periods of the Late Pleistocene, an abundance of proxy data demonstrates the existence of large and repeated millennial-scale warming episodes, known as Dansgaard–Oeschger (DO. the possible accumulation of a radionuclide in the biosphere from an eventual groundwater contamination. The potential accumulation in the biosphere is often estimated by water uptake rate and concentration of a radionuclide in soil water, here after called passive uptake.
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Modelling the transfer of radionuclides in particular parts of the biosphere identified as being of potential radiological significance and where there were gaps in modelling approaches.
This topic was explored using a range of methods including reviews of the literature, model. Radionuclides in the biosphere. movement and cycling of trace elements and radionuclides through the mar ine. and used these data in a simple model which. The migration of radionuclides from a borehole repository located about 20 km from the Akwapim fault line which lies in an area of high seismicity was analyzed for some selected radionuclides.
In the event of a seismic activity, fractures and faults could be rejuvenated or initiated resulting in container failure leading to the release of radionuclides. A Cited by: 2. The safety assessment of a deep repository for nuclear waste poses challenging scientific and technical questions.
The risks from leakage of radionuclides from the repository, including transfers to the biosphere and the food chain must be cturer: Icp. Analyses of Radionuclide Migration in Geologic Media Using Compartment Models Daisuke Kawasaki Department of Nuclear Engineering Univerisity of California, Berkeley Decem Migration of a Single Particle through an Array of Compartments Parameters describing biosphere object geometries 37 Total size of biosphere objects after isolation from the sea 37 Surface area of the aquatic part of each biosphere object 38 Surface area of the terrestrial part of the biosphere objects 38 Average depth of water 38 Thickness of glacial till layer 38File Size: 3MB.
The migration of gaseous radionuclides through soil overlying a uranium ore deposit: A modeling study (GJBX) [Hewitt W Jeter] on *FREE* shipping on qualifying offers. biosphere assessment is to develop a fully dynamic model for the development of the surface environments, radionuclide transport and radiological consequences analysis.
The time window adopted in the present assessment is the period over which the. The mechanisms of transport and retaidation processes, chemistry and migration behaviour of radionuclides of fission products and actinides in engineered barriers, especially bentonites, have been summarised.
A “critical group of radionuclides” is proposed for thorough investigation of their retardation properties in natural sorbents. The evaluation of accessible Cited by: was at least tons. From the UNSCEAR data on release of radionuclides during the mining, milling, conversion and enrichment processes  it may be inferred that production of this amount of natural uranium introduced into the atmosphere X 10"2 Ci of U, X 10"2 Ci of Ra, X Ci of Rn, and X 10~3 Ci of U each.
Behavior of Radionuclides in the Environment FIG. Migration path of radioactive nuclides from a waste repository to man. Radioactive releases and possible effects In earlier chapters, there have been brief discussions of the release of radionuclides to the environment.
The simplified model for migration of radionuclides from the HLW through the geosphere assumes ultimate failure of the primary contain- ment system, and proceeds to estimate the concentrations of Individual radionuclides that will escape from the repository by (a) leaching into groundwater, (b) transport in and/or through the groundwater in the.
ing the mobility of radionuclides, (b) the form into which those radionuc>Lides ane transformed during the milling and waste treatment operation, and (c) the conseque; of this transformation as related to their mobility within and the flux rate from the waste man~ agement area over geological time.
Only through anCited by: Model (1) can be derived accounting for the role that the partition coefficient k d has in the long term migration of radionuclides through a catchment (Joshi and Shukla, ).
The fluvial removal F ir (Bq m −2 s −1) is assumed to be proportional to the radionuclide inventory in the watershed S (t) at instant t (Bq m −2).Cited by: Modelling Radioactivity in the Environment 3 It should be emphasised that specific radioisotopes may have more than one source: for example, 3H which can be produced in situ, is formed cosmogenically, is a component of anthropogenic atmospheric fall-out and is also a major component in many wastes considered for geological.
The present paper summarises the results of the review and assessment of state-of-the-art models developed for predicting the migration of radionuclides through rivers. The different approaches of the models to predict the behaviour of radionuclides in lotic ecosystems are presented and by: A main caveat in the interpretation of observed changes in atmospheric Δ 14 C during the l years is the unknown variability of the carbon cycle, which together with changes in the 14 C production rates determines the 14 C dynamics.
A plausible scenario explaining glacial/interglacial dynamics seen in atmospheric CO 2 and δ 13 C was proposed recently Cited by: 9. The cosmogenic radionuclides, 10Be, 14C and others, provide a record of the paleo-cosmic radiation that extends >10, years into the past.
They are the only quantitative means at our disposal to study the heliosphere prior to the commencement of routine sunspot observations in the 17th century. The cosmogenic radionuclides are primarily produced by Cited by: The pathways of radionuclides through the environment are extraordinarily complex.
Figure 1 shows clearly that the release of fallout into the air (e a) or into water (e w) starts a complicated migration pattern through the biosphere. Fallout brought to the air is deposited onto the soil, the vegetation and on water surfaces.
Transportation by. Oklo, Natural Analogue of the radionuclides migration through the geological barrier Oklo, Analogue Naturel de la migration de radionucléides dans l'environnement ABSTRACT - One of the main part of the CEC project "Oklo-Natural Analogue" is devoted to present time migration studies.
This part comprises. (2) Migration study of through hydrological cycle such as soil water, radionuclides rivers, lakes and ponds, ground water 1) Investigation on migration through radionuclide soil water, ground water, stream water, spring water under different land use 2) Study on paddy-to-river transfer of radionuclides through suspended sediments.The model simulation successfully reproduced the observed data from 3year migration of ()Cs in the organic and mineral soil layers at a contaminated forest near Fukushima.Review of Mathematical Models For Transport of Radionuclides in Surface Waters ultimate obstacle in achieving predictive power and general validity for a model is to find the most appropriate simplifications, and/or omit small and irrelevant processes.