What happens to carbon -14 levels in a a living organism after dies?

After a living organism dies, it stops taking in carbon-14, which is a radioactive isotope of carbon. Over time, the carbon-14 that remains in its tissues begins to decay at a known rate, with a half-life of about 5,730 years. As a result, the levels of carbon-14 decrease steadily, which can be measured to determine the time since death, a process known as radiocarbon dating. This decline continues until the carbon-14 is no longer detectable after several half-lives.