The fact that they are squashed indicates that part of the decay process began before the material was compressed, so the polonium had to be present before compression.
In his study Rutherford measured the U and He He is an intermediate decay product of U contents of uranium-bearing minerals to calculate an age.
As these fragments travel through the atmosphere, they become superheated and malleable as they melt to a read-hot glow, and are formed and shaped as they fly along.
New York, Elsevier:
Description: Matsumoto, N. We here review the principle, the analytical procedures, the advantages and the limitations of the two techniques.