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As we pointed out in these two articles, radiometric dates are based on known rates of radioactivity, a phenomenon that is rooted in fundamental laws of physics and follows simple mathematical formulas.

Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.

We also know that before the Envronmental Protection Agency started regulating the amount of lead additives to gasoline in 1973, atmospheric concentrations of non-radioactive lead was relatively high because of automobile emissions.

After 1973, atmospheric lead levels started to decrease and by 1988 were considerably lower.

Pb has a half-life of 22.3 years, which means that after 22.3 years, only half of the original amount is undecayed.

If the sediment layers are undisturbed, then as the sediment ages it slowly loses its radioactivity.

Mean annual sedimentation rates over the last 20–30 years were determined in the pre-alpine Mondsee (Upper Austria) using Cs-137 and Pb(Po)-210 profiles for sediment core dating and two natural sediment markers.

Lower sedimentation rates of about 2–3 mm yr were found in the central part of the lake at 47 and 65 m and in the northern bay at 18 and 41 m depth.

metal), if it is produced in soils close to the air-soil interface.I wish to reconstruct pollution history and derive sedimentation rates in such a system.Please note that sediment core samples have not yet been collected.Note that the time it takes for each to decay varies from minutes to billions of years.The decay emission is either an electron (Cs) is visible as a distinct peak in many recent sediments.

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