bender online dating - History of radiocarbon dating
Two characteristic times can be defined: Notice that dates are customarily given in years BP which implies t(BP) = –t because the time arrow for dates runs in reverse direction from the time arrow for the corresponding ages.
From these considerations and the above equation, it results: For a raw radiocarbon date: Measurements are traditionally made by counting the radioactive decay of individual carbon atoms by gas proportional counting or by liquid scintillation counting.
AMS allows dating samples containing only a few milligrams of carbon.
Raw radiocarbon ages (i.e., those not calibrated) are usually reported in "years Before Present" (BP).
For samples of sufficient size (several grams of carbon) this method is still widely used in the 2000s.