Determination of recent sedimentation rates in Lake Michigan using Pb-210 and Cs-137
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چکیده
منابع مشابه
Sedimentation dynamics in the East China Sea elucidated from 210 Pb , 137 Cs and 239 , 240 Pu
Sedimentation dynamics in the East China Sea was investigated based on profiles and inventories of Pb , Cs and ex Pu in sediment cores collected from various settings in this marginal sea. The derived sedimentation rates vary by two orders of magnitude, from ;2 to 0.02 cm yr, and generally decrease southward along the inner shelf and eastward offshore. This pattern is consistent with the disper...
متن کاملSediment chronology in San Francisco Bay , California , defined by 210 Pb , 234 Th , 137 Cs , and 239 , 240 Pu
Sediment chronologies based on radioisotope depth profiles were developed at two sites in the San Francisco Bay estuary to provide a framework for interpreting historical trends in organic compound and metal contaminant inputs. At Richardson Bay near the estuary mouth, sediments are highly mixed by biological andror physical processes. Excess Th penetration ranged from 2 to more than 10 cm at e...
متن کاملBioaccumulation of 210 Po and 210 Pb in Arctic seabirds
INTRODUCTION When considering the potential radiological impacts of anthropogenic radionuclides in the environment, it is important to understand the doses incurred by biota by natural activity concentrations of naturally occurring radionuclides. Naturally occurring Po (half-life138 days) and Pb (half-life 22.3 years) are members of the U decay chain. In the marine environment, Po and Pb are pr...
متن کاملSpatial variability of recent sedimentation in Lake Ohrid
Introduction Conclusions References
متن کاملRecent water level declines in the Lake Michigan-Huron system.
Great Lakes water levels have fluctuated over thousands of years. High water levels were a problem in the 1980s, but a recent sudden drop in Lakes Michigan and Huron has caused particular concern, in part because lower water levels are consistent with many global climate change scenarios. We examined water level data (1860-2006) representing Lakes Michigan and Huron to evaluate changes in both ...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 1975
ISSN: 0016-7037
DOI: 10.1016/0016-7037(75)90198-2