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Imaginemos um derrame de riolito, que sofreu metamorfismo se transformando em um metariolito. Quais os eventos que podem ser datados? Geoscience Reports Spring Such claims are based on radioisotope dating. The assignment of Lucy's age was made from potassium-argon dating of the rock in which her skeleton was found. The conflicting testimony of the Bible concerning the amount of time since Creation Week requires a critical evaluation of radioisotope dating. What is a Radioisotope Age? For the dating of Lucy, P was the unstable isotope 40 of potassium [ 40 K] and D was the stable isotope 40 of argon [ 40 Ar].
Landmarks in the history of radioactivity and current tendencies. The first days of radioactivity, the discoveries of X-rays, radioactivity, of a - and b - particles and g - radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such as the Manhattan project and some nuclear and radiological accidents. Nuclear energy generation in Brazil and the world, as an alternative to minimize environmental problems, is discussed, as are the medicinal, industrial and food applications of ionizing radiation. The text leads the reader to reflect on the subject and to consider its various aspects with scientific and technological maturity. Keywords: the history oh radioactivity; nuclear accidents; beneficial uses of radioactivity. A descoberta dos raios-X. Mais recentemente, seu nome foi dado ao novo elemento