Half life and radioactive dating


05-Apr-2018 19:31

So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.

Relative dating methods are used to determine only if one sample is older or younger than another.Cosmic rays: Invisible, high-energy particles that constantly bombard Earth from all directions in space.Dendrochronology: Also known as tree-ring dating, the science concerned with determining the age of trees by examining their growth rings.The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers.

This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.When finding the age of an organic organism we need to consider the half-life of carbon 14 as well as the rate of decay, which is –0.693.