If they can begin to comprehend that it is random and spontaneous, they end up feeling less nervous about the whole thing.
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.
measurement, measuring, mensuration, measure - the act or process of assigning numbers to phenomena according to a rule; "the measurements were carefully done"; "his mental measurings proved remarkably accurate" techniques to precisely measure the age of the eruptions of the Kalkarindji volcanic province where lavas covered an area of more than 2 million square kilometers in the Northern Territory and Western Australia.
A process for determining the age of an object by measuring the amount of a given radioactive material it contains.
The object's approximate age can then be figured out using the known rate of decay of the isotope.