P239u is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of P239u present today will be present in 1000 y?   What is the density of the Mg1224 nucleus in g/mL, assuming that it has the typical nuclear diameter of 1x10-13 cm and is spherical in shape?

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Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.