Author: J. F. RelyeaPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Methods for Determining Radionuclide Retardation Factors
Author: J. F. RelyeaMethods for Determining Radionuclide Retardation Factors
Author: I-129 Supplemental Information, Document Numbers 351-357
Author: Dana J. IsherwoodEnvironmental Radiochemical Analysis II
Author: Peter Warwick (Prof.)Publisher: Royal Society of Chemistry
ISBN: 9780854046188
Category : Science
Languages : en
Pages : 438
Book Description
Environmental Radiochemical Analysis II brings together comprehensive, up-to-date information from international experts in the field. Coverage includes information on new methods of radionuclide analyses, developments and improvements in existing methods, method comparisons, gamma detector performance and new software products, method uncertainty, underground laboratory facilities, method QA and QC, field studies covering colloid work, in-situ injection into rock strata and sampling of reduced waters for actinide assay. This stimulating, authoritative text makes essential reading for practising radioanalysts and provides valuable information for researchers and professionals in academia and industry.
Preliminary Report on Retardation Factors and Radionuclide Migration
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Available data on distribution coefficients for the biologically important radionuclides present in high-level waste were used to estimate retardation factors (K/sub f/) for a mass transport hydrologic model. The radionuclides were divided into 3 groups: fission products with no sorption (K/sub f/ = 1), fission products with sorption (K/sub f/ = 102), and the actinides and their daughter products (K/sub f/ = 104). Minimum and maximum values were assigned the latter two groups. Uncertainties as a function of time were estimated at +- an order of magnitude. 39 references, 5 tables.
Natural-analog Studies for Partial Validation of Conceptual Models of Radionuclide Retardation at the Waste Isolation Pilot Plant (WIPP).
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Transport by groundwater within the Culebra Dolomite, an aquifer above the Waste Isolation Pilot Plant (WIPP), is the most probable mechanism for long-term release of radionuclides to the accessible environment. Radionuclides could be retarded by sorption if the groundwater is exposed to sufficient amounts of fracture-lining clays. In this natural-analog study, distributions of U and trace metals have been examined to constrain the strength of clay/solute interactions within the Culebra. Uranium solid/liquid distribution ratios, calculated from U concentrations of groundwaters and consanguineous fracture-filling clays, range from (approximately)80 to 800 ml/g and imply retardation factors of 60 to 500 using a fracture-flow model. Retardation factors inferred from uranium-series disequilibria and 14C ages in Culebra groundwaters alone are much lower ((approximately)10), implying that clays may contain a significant unreactive component of U. Such a possibility is corroborated by Rb/Sr ages; these imply long-term stability of the clays, with resetting occurring more than 250 Ma ago. Factor analysis and mass-balance calculations suggest, however, that Mg-rich clays are dissolving in Pleistocene-age groundwaters and/or are converting to Na-rich smectites, and that B and Li are taken up from the water by the clays. Apparently, the solution chemistry reflects gradual equilibration of clays with groundwater, but thus far the bulk of the clays remain structurally intact. Measurements of the distribution of U in the Culebra will be more meaningful if the inert and exchangeable components of the U content of the clays can be quantified. 26 refs., 3 figs., 2 tabs.
Soil Screening Guidance
Author: Energy Research Abstracts
Author: NUREG/CR.
Author: U.S. Nuclear Regulatory CommissionPublisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 348
Book Description
Apparatus for the Measurement of Radionuclide Transport Rates in Rock Cores
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
An apparatus and procedure for the study of radionuclide transport in intact rock cores are presented in this report. This equipment more closely simulates natural conditions of radionuclide transport than do crushed rock columns. The apparatus and the procedure from rock core preparation through data analysis are described. The retardation factors measured are the ratio of the transport rate of a non-retarded radionuclide, such as 3H, to the transport rate of a retarded radionuclide. Sample results from a study of the transport of /sup 95m/Tc and 85Sr in brine through a sandstone core are included.