River Basin Erosion Dynamics

Isotopes used for contemporary erosion Unsupported 210Pb t1/2 = 22.2 yr Naturally occurring as part of 238U decay series Fraction of total 210Pb in soil derived from 222Rn gas that leaves soil Delivered back to soil through fallout • 1 1/2 = 30.2 yr • +112 137CS Created from nuclear weapons testing and accidents Delivered to soil through fallout • Only deposited globally from 1950's to 1970's

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