For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms.
Radiocarbon dating is one such type of radiometric dating.
Potassium/Argon decay is used to measure ages of the “oldest” rocks.
The precise methods of decay vary, but the principle for determining age is generally the same.
The assumed original ratio, stability of the decay rate, and the disregard for other factors affecting ratios over time reveal that conventional radioactive dating methods are highly questionable.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (rā'dē-ō-mět'rĭk) A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it.
Love-hungry teenagers and archaeologists agree: dating is hard.
The Carbon-14 (C) dating method is useful for dating organic material. Rubidium/Strontium decay is generally used to date igneous and metamorphic rock.
Libby received the Nobel Prize in Chemistry for his work in 1960.
The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.
For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.
Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.