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Radiocarbon dating of ancient rock paintings

Description: This report presents progress made on a technique for {sup 14}C dating pictographs. A low-temperature oxygen plasma is used coupled with high-vacuum technologies to selectively remove C-containing material in the paints without contamination from inorganic carbon from rock substrates or accretions.
Date: June 20, 1995
Creator: Ilger, W. A.; Hyman, M.; Rowe, M. W. & Southon, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Groundwater velocities at the Nevada Test Site: {sup 14}Carbon-based estimates

Description: Chemical and isotopic data can be used to constrain and validate groundwater flow models. This study examines probable groundwater flowpaths at the Nevada Test Site (NTS) and estimates groundwater velocities for these flowpaths using water chemistry and carbon isotopes. These velocities are provided for comparison to velocities calculated by a numerical flow model developed by GeoTrans, Inc. Similar to numerical flow models, models of chemical and isotopic evolution are not unique; any number o… more
Date: July 1, 1995
Creator: Chapman, J.B.; Hershey, R.L. & Lyles, B.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PUREX low-level waste radionuclide characterization

Description: The PUREX low-level waste (LLW) radionuclide characterization document describes the methodology for the characterization of solid LLW and solid low-level mixed waste (MW) with the respect to radiological characteristics. This document only serves as an overview of the PUREX radionuclide characterization methodology and provides specific examples for how the radionuclide distribution is derived. It would be impractical to provide all background information in this document. If further clarifica… more
Date: January 16, 1995
Creator: Ellis, M. W. & LeBaron, G. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TWRS privatization support project waste characterization database development

Description: Pacific Northwest National Laboratory requested support from ICF Kaiser Hanford Company in assembling radionuclide and chemical analyte sample data and inventory estimates for fourteen Hanford underground storage tanks: 241-AN-102, -104, -105, -106, and -107, 241-AP-102, -104, and -105, 241-AW-101, -103, and -105, 241 AZ-101 and -102; and 241-C-109. Sample data were assembled for sixteen radionuclides and thirty-five chemical analytes. The characterization data were provided to Pacific Northwes… more
Date: November 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Description: The finite element code FEHMN is a three-dimensional finite element heat and mass transport simulator that can handle complex stratigraphy and nonlinear processes such as vadose zone flow, heat flow and solute transport. Scientists at LANL have been developed hydrologic flow and transport models of the Yucca Mountain site using FEHMN. Previous FEHMN simulations have used an equivalent K{sub d} model to model solute transport. In this thesis, FEHMN is modified making it possible to simulate the … more
Date: December 31, 1995
Creator: Viswanathan, H. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method performance for radioanalytical chemistry

Description: This document provides method qualification data for radioanalytical procedures as required by WHC-SD-CP-QAPP-016. A short description of the Methodology, the original source(s) of the methodology, a MDC example, and precision and accuracy from historic data.
Date: September 1, 1995
Creator: Catlow, S. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Significance of apparent discrepanices in water ages derived from atmospheric radionuclides at Yucca Mountain, Nevada

Description: Cosmogenic {sup 36}Cl and {sup 14}C produced in the atmosphere are being used to estimate water residence times in the unsaturated zone at Yucca Mountain. Results thus far show a systematic discordance in that {sup 14}C-based ages are generally one to two orders of magnitude younger than {sup 36}Cl-based ages. This lack of concordance probably arises from one or more of the following reasons: (1) different transport mechanisms, e.g., vapor transport for {sup 14}C; (2) different magnitudes and t… more
Date: February 23, 1995
Creator: Liu, B.; Fabryka-Martin, J.; Wolfsberg, A.; Robinson, B. & Sharma, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lithogenic and cosmogenic tracers in catchment hydrology

Description: A variety of physical processes affect solute concentrations within catchment waters. The isotopic compositions of the solutes can indicate which processes have determined the observed concentrations. These processes together constitute the physical history of the water, which is one of the primary concerns in hydrology. Many groundwater solutes are derived as a result of interaction between the water and the rock and/or soil within the system. These are termed {open_quotes}lithogenic{close_quo… more
Date: January 1, 1995
Creator: Nimz, G.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development and application of the mollusc Arctica islandica as a paleoceanographic tool for the North Atlantic Ocean

Description: Until now there has been no tool comparable to corals for reconstructing long term high-resolution geochemical time-series for the colder, higher-latitude oceans. In this thesis, the long-lived (+100 years) boreal mollusc (Bivalvia) Arctica islandica is shown to be practical for this purpose in the northern North Atlantic Ocean. The evidence, compiled here, demonstrates that the carbonate shell of this species faithfully records the ambient dissolved inorganic carbon`s (DIC) radiocarbon ({Delta… more
Date: September 1, 1995
Creator: Weidman, Christopher R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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