The carbon-14 atoms combine with oxygen to form carbon dioxide, which plants absorb naturally and incorporate into plant fibers by photosynthesis.
Animals and people take in carbon-14 by eating the plants.
Radiocarbon dating is a method of estimating the age of organic material.
It was developed right after World War II by Willard F.
In the search for the value of the half life of carbon 14, also known as radiocarbon, I looked in two textbooks -- one of Chemistry and one of Physics (both of which are very current), an encyclopedia, a technical magazine article, and a really old book from the nineteen seventies.