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Over time, radioactive isotopes change into stable isotopes by a process known as radioactive decay.Some radioactive parent isotopes decay almost instantaneously into their stable daughter isotopes; others take billions of years.It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.This has to do with figuring out the age of ancient things.If you could watch a single atom of a radioactive isotope, U-238, for example, you wouldn’t be able to predict when that particular atom might decay. Wiens has a Ph D in Physics, with a minor in Geology.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.

He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.This decay is an example of an exponential decay, shown in the figure below.Knowing about half-lives is important because it enables you to determine when a sample of radioactive material is safe to handle.Scientists determined the Earth's age using a technique called radiometric dating.Radiometric dating is based upon the fact that some forms of chemical elements are radioactive, which was discovered in 1896 by Henri Becquerel and his assistants, Marie and Pierre Curie.

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“It should be made clear that the D-backs seek no damages in this suit nor are they seeking any taxpayer funding,” D-backs attorney Leo R. “They are asking the court for the ability to remove the contract restriction that prevents the Diamondbacks from exploring other stadium options.” Maricopa County Board of Supervisors Chairman Clint Hickman responded in a statement the same day, calling it “disappointing” that the Diamondbacks are “suing their fans who helped build Chase Field.” “The team simply wants out of the contract that makes them stay and play through the 2028 season.

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