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.
By measuring (Cs)analyses for the 1998 short-cores from Bear Lake.
Results indicate that our cores contain sediments from the 20th Century and that sedimentation rates increased when the Bear River was diverted into the lake.
The highly reactive lead is then rapidly adsorbed to and incorporated into the depositing sediment.