Leonid A. Neymark, James B. Paces
This study investigates the mineral abundances and uranium-series isotopic compositions in core samples from borehole USW SD-9 at Yucca Mountain, Nevada, to evaluate water-rock interactions essential for understanding the proposed nuclear waste repository. The objective is to assess how fractured and unfractured rock systems differ in their interaction with water and uranium transport. Methodologically, samples from variably zeolitized tuffs were analyzed for uranium concentrations and isotopic compositions, including pore water and rock leachates. The results reveal that both unfractured core samples and rubble fragments exhibit similar uranium-series disequilibrium, indicating a complex absorption and loss history of uranium over the last million years. Notably, the findings suggest that the level of water-rock interaction might not significantly differ between the rock matrix and fracture surfaces. Furthermore, it was determined that the rock matrix can effectively scavenge uranium from percolating water, pointing towards greater radionuclide retardation and dose reduction capabilities of the natural barriers than currently acknowledged. Additionally, the pore water and leachate analyses provide long-term in situ uranium partition coefficient estimates exceeding 7 milliliters per gram.
@article{38a17181-4edf-436d-a8dc-515b6f301c3b,
title={Uranium-Series Constraints on Subrepository Water Flow at Yucca Mountain, Nevada},
author={Leonid A. Neymark and James B. Paces},
year={2006},
language={en}
}TY - JOUR TI - Uranium-Series Constraints on Subrepository Water Flow at Yucca Mountain, Nevada AU - Leonid A. Neymark AU - James B. Paces PY - 2006 LA - en ER -
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