Dating uses properties atoms
In archaeology, radioactive isotopes are used to determine the age of a sample, called Carbon Dating.
Since the Carbon-14 isotope is radioactive it has been used to assess the age of matter.
As the isotopes decay and release energy, that energy destroys the tumour.
The isotopes of an element have the same chemical properties but different weights.
This means it is difficult to separate isotopes from each other by chemical processes.
Since C-14 decays at a rate where half of it has changed in about 5600 years – known as its half-life – the years since death can be calculated. Their numbers and ratios have been constant since the formation of the solar system The term stable in this context means ‘not radioactive’.
For example, if the object or fossil has only 1/4 of the C-14 in it as compared with living objects, it died around 11,200 years ago. Radiogenic isotopes are isotopes formed from decay of radioactive isotopes; 87Sr is a commonly used radiogenic isotope. Twenty elements, including fluorine, sodium, aluminum, phosphorus, and gold, have only one stable isotope.
The uses of isotopes have been widespread, in all sectors of life. Radioactive isotopes are more common than stable isotopes.