Why is u 238 used for dating rocks

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These two uranium isotopes decay at different rates. The half-life of the uranium-238 to lead-206 is 4.47 billion years.The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years.

These two uranium isotopes decay at different rates. The half-life of the uranium-238 to lead-206 is 4.47 billion years.The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years.

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U-235, when bombarded by neutrons, fissions or splits into two smaller nuclei and releases energy and starts nuclear chain reaction.

Because of the energy released, U-235 is efficient for power generation and the only isotope of uranium that can sustain these reactions.

When the isotope is halfway to that point, it has reached its half-life.

There are different methods of radiometric dating that will vary due to the type of material that is being dated.

U-238 and U-235 (which has 143 neutrons) are the most common isotopes of uranium.

Uranium naturally contains all three isotopes (U-238, U-235 and U-234), and it rarely varies more than 0.01% from the average composition shown in the table below without our intervention.Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.For example, uranium-lead dating can be used to find the age of a uranium-containing mineral.It works because we know the fixed radioactive decay rates of uranium-238, which decays to lead-206, and for uranium-235, which decays to lead-207.Despite any processing, enriched, depleted or natural uranium all behave the same chemically.Uranium ore oxidizes to uranium oxy-hydroxides when exposed to the air and/or water.As a member, you'll also get unlimited access to over 70,000 lessons in math, English, science, history, and more.Plus, get practice tests, quizzes, and personalized coaching to help you succeed.To produce fuel-grade uranium, the uranium has to be processed to produce uranium dioxide and to enrich or concentrate the U-235 in the fuel pellets.During this processing, depleted uranium (DU), enriched in U-238 and depleted in U-235, is produced.

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