Once the principle behind this method was discovered, however, it became possible to gather reliable information about the age of Earth and its rocks and fossils.Radioactive dating was not possible until 1896, when the radioactive properties of uranium (a radioactive metallic element) were discovered by French physicist (a person specializing in the study of energy and matter), Antoine Henri Becquerel (1852–1908).
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates.The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.He eventually designed a device that used Geiger counters (which measure radiation) to accurately measure the amount of carbon-14 left in an organic substance.Libby won the 1960 Nobel Prize in chemistry for his discovery.Radioactive dating is a method of determining the approximate age of an old object by measuring the amount of a known radioactive element it contains.
Rocks as well as fossil plants and animals can be dated by this process.Besides dating plant and animal life, this method has been used to verify the age of such different artifacts as the Dead Sea Scrolls (2,100 years), a charcoal sample from an ancient South Dakota campsite (7,000 years), and a pair of sandals from an Oregon cave (9,300 years).Improvements have raised its accuracy to nearly 70,000 years, with an uncertainty of plus-or-minus 10 percent.[See also Fossil; Paleontology ] gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).This method proved useful to date rocks as young as 50,000 years old. Called the carbon-14 dating technique, this ingenious method used the simple knowledge that all living plants and animals contain carbon (a nonmetallic element that occurs in all plants and animals).Libby also knew that while most of this carbon is a common, stable form called carbon-12, a very small amount of the total carbon is radioactive carbon-14.Boltwood (1870–1927) suggested that knowledge of radioactivity might be used to determine the age of Earth's crust.