Consider an arbitrary radionuclide X (τ = 30 min), which decays to the stable nuclide Y through β− decay. If a sample contains 2 pmol1 of X, what is the activity of this sample? If the sample were allowed to stand for a period of 7 hours, what would be its activity?

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;

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