Before radiocarbon dating
Plants take up atmospheric carbon dioxide by photosynthesis, and are eaten by animals, so every living thing is constantly exchanging carbon-14 with its environment as long as it lives. In 1958 Hessel de Vries showed that the concentration of carbon-14 in the atmosphere varies with time and locality.
The relatively short-lived C taken into organic matter is also slightly variable. However, under about 20,000 years the results can be compared with dendrochronology, based on tree rings.
Sometimes only one method is possible, reducing the confidence researchers have in the results.
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The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.However, no advertisements or solicitations to support any organization (scientific, academic or religious) are allowed. This article summarizes the conclusions of the three Q&A sections below, and sketches some promising directions for an intellectually honest common ground between science and religion.Q&A: Evolution, Creationism and Intelligent Design (28 articles).In 1960, he was awarded the Nobel Prize in Chemistry for this work.He first demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from an ancient Egyptian royal barge of which the age was known from historical documents.