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Article
Source of radium in a well-water-augmented Florida lake.
Faculty Publications
  • Joseph M. Smoak
  • James M. Krest
SelectedWorks Author Profiles:

Joseph M. Smoak

Document Type
Article
Publication Date
2006
Date Issued
January 2006
Date Available
January 2012
Abstract
A study of the lake waters of Saddleback Lake, Florida was undertaken with the goal of determining the source of elevated radium activities in the lake. Four radium isotopes, 226Ra, 228Ra, 223Ra and 224Ra, were measured and activities of all the four radium isotopes were substantially greater in the well water used to augment the lake as compared to the lake waters. In the surface water, radium activities were highest close to the well used for augmentation in the initial sampling. Activities initially decreased with time after augmentation from the well ceased. The 223Ra/226Ra activity ratio decreased during the first month of sampling and closely followed an exponential decay curve based on the 223Ra decay constant. Trends in the activities and the 223Ra/226Ra activity ratios support the conclusion that the well used to augment the lake was the dominant source of 223Ra and 226Ra to Saddleback Lake during this study. The 224Ra/226Ra activity ratio did not follow the expected trend of exponential decay based on the 224Ra decay constant. While the augmentation well supplied some 224Ra, these results suggest that there must be an additional source of 224Ra to the lake. The most likely additional source of 224Ra appears to be the ingrowth of 224Ra on the sediment within the lake from 228Ra (via 228Th).
Comments
Abstract only. Full-text article is available only through licensed access provided by the publisher. Published in Journal of Environmental Radioactivity, 89, 102-114. doi:10.1016/j.jenvrad.2006.03.007 Members of the USF System may access the full-text of the article through the authenticated link provided.
Language
en_US
Publisher
Elsevier Science Pub. Co.
Creative Commons License
Creative Commons Attribution-Noncommercial-No Derivative Works 4.0
Citation Information
Smoak, J.M. & Krest, J.M. (2006). Source of radium in a well-water-augmented Florida lake. Journal of Environmental Radioactivity, 89, 102-114. doi:10.1016/j.jenvrad.2006.03.007