Radioactive dating animation
Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history.
After all, the ever-changing Earth rarely left a complete geological record.
The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.But it is possible to measure the time taken for half of the nuclei in a radioactive material to decay.This is called the half life of radioactive material or radioisotope.The count rate is measured by using an instrument called a Geiger-Muller tube over a period of time.A Geiger-Muller tube detects radiations by absorbing the radiation and converting it into an electrical pulse which triggers a counter and is displayed as a count rate. ] Radioactive elements have a wide range of half life values.