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Most of the fission products are in solid form and mix into the atmosphere and eventually settle to the earth’s surface as fallout.
It is also assumed that the rates of isotope input and sediment input are constant over time.
This will allow the determination of accumulation rate for the mid portion of the core.
If one assumes that the accumulation rate has remained constant in the upper, more recent sediments, then the age of the sediments can be calculated for any depth in the core.
In lieu of these analyses, it is necessary to make an assumption that the background level is less than the lowest activity measured in the core but greater than zero.
An iterative best fit computer model was designed to process the data in cases where the Po-210 background activity is not known.