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Determination Of 237np In Bioassay Fecal Samples, Bettylou M. Wahl
Determination Of 237np In Bioassay Fecal Samples, Bettylou M. Wahl
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237Np, a long-lived alpha-emitting actinide, is present in the environment due to releases from atmospheric nuclear weapons tests, reactor accidents, and nuclear reprocessing plants. The determination of long-lived actinides, such as neptunium, is essential for worker monitoring and environmental control. In bioassay and environmental samples, a radiochemical separation is necessary before measurement in order to eliminate any inferences that may occur in a mixture of actinides. In this paper, a method for determining 237Np in fecal samples using TEVA resin is investigated. Using 239Pu as a tracer, tetravalent plutonium and neptunium were successfully separated from other actinides. …
Effects Of Urbanization On Environmental Parameters In Aquatic Systems Along An Urban-Rural Gradient In Northeastern Illinois, Tiffany Garrett
Effects Of Urbanization On Environmental Parameters In Aquatic Systems Along An Urban-Rural Gradient In Northeastern Illinois, Tiffany Garrett
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The transformation of landscapes from rural to urban land use impacts affected ecosystems. Replacing natural vegetation with impervious surfaces and introducing environmental stressors through increased human activity can significantly alter aquatic ecosystems. This study examined the effects that urbanization had on salinity, dissolved oxygen, temperature, conductivity, and pH of aquatic systems along an urban-rural gradient in Illinois, Chicago land area- Little Calumet River, Thorn Creek, and Kankakee River. The first objective of this project was to examine whether there were changes or fluctuations among various environmental parameters that may be due to heavily populated residential areas when compared to a …