Fallout-radionuclide activity in samples collected from fine-grained, streambed sediment in the Black Creek, Indiana stream-channel network, 2019
Dates
Publication Date
2024-01-05
Start Date
2019-07-22
End Date
2019-07-25
Citation
Karwan, D.L., and Williamson, T.N., 2023, Fallout-radionuclide activity in samples collected from fine-grained, streambed sediment in the Black Creek, Indiana stream-channel network, 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P9L5P7BZ.
Summary
These data provide beryllium-7 (7Be) and excess lead-210 (210Pbxs) activity for fine-grained, mobile, streambed sediment in the Black Creek, Indiana (IN) stream-channel network. This basin is monitored in cooperation with the Great Lakes Restoration Initiative (GLRI). During the period July 22-25, 2019 (summer low flow), the thickness and spatial extent of soft, mobile, fine-grained (mainly silt and clay) streambed sediment was inventoried and sampled along 150-meter (m) transects. A combination of stream corridor land-use distribution, valley type, channel slope, stream order (Strahler, 1957), and ecoregion (Omernik and Griffith, 2014) was used to select 30 rapid geomorphic assessment reaches using methods of Fitzpatrick and others [...]
Summary
These data provide beryllium-7 (7Be) and excess lead-210 (210Pbxs) activity for fine-grained, mobile, streambed sediment in the Black Creek, Indiana (IN) stream-channel network. This basin is monitored in cooperation with the Great Lakes Restoration Initiative (GLRI). During the period July 22-25, 2019 (summer low flow), the thickness and spatial extent of soft, mobile, fine-grained (mainly silt and clay) streambed sediment was inventoried and sampled along 150-meter (m) transects. A combination of stream corridor land-use distribution, valley type, channel slope, stream order (Strahler, 1957), and ecoregion (Omernik and Griffith, 2014) was used to select 30 rapid geomorphic assessment reaches using methods of Fitzpatrick and others (2016); twelve of these were sampled for sediment fingerprinting and fallout-radionuclide (FRN) analysis.
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BlackCrk_streambed_7Be_2023nov1.xml Original FGDC Metadata
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16.64 KB
application/fgdc+xml
FRN_blk_2019.csv
467 Bytes
text/csv
Purpose
Fallout radionuclides, including 7Be and 210Pbxs, are primarily delivered during rain events to exposed surface soil or sediment. Their different half-lives (7Be: 53.3 days, 210Pb: 22.3 years) provide a mechanism to differentiate material that has moved within weeks to months versus that moving on the order of decades (Matisoff and others, 2005). Excess 210Pb accounts for the 210Pb that exceeds that from Radium-226 (226Ra) decay and is attributed to atmospheric deposition of the 210Pb decay product of Radon-222 (222Rn), which diffused from the subsurface to the atmosphere.
