Dating Rocks Using Uranium 238

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Uranium-234-uranium-238 dating | Britannica
Radiometric Dating: Carbon-14 and Uranium-238 - YouTube
How are C-14 and U-238 dating used together in order to . . .
Why is uranium 238 used to date rocks? - Answers
About Uranium-Lead Dating - ThoughtCo
Zircon Chronology: Dating the Oldest Material on Earth | AMNH
GCSE PHYSICS - What is Radiodating? - How can Radiodating . . .
Radiometric dating - Wikipedia
Radioactive dating - Uses and hazards of radiation - GCSE . . .
Using Uranium/Lead Dating to Estimate the Age of a Rock . . .
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Uranium -234- uranium - 238 dating , method of age determination that makes use of the radioactive decay of uranium-238 to uranium -234; the method can be used for dating of sediments from either a marine or a playa lake environment . Because this method is useful for the period of time from about 100,000 years to 1,200,000 years before the present, it . . .
When you read about the ages of certain ancient artifacts, or even the age of the earth itself, how do we know such numbers? How can we know that a fossil is . . .
Uranium 238 is only found in igneous or volcanic rocks . So no fossils can be dated directly using U 238 . Because of the huge differences in the half lives of Carbon 14 and Uranium238 they cannot be used together . Carbon 14 can only be used to date fossils of a very recent age . Uranium 238 can only be used to date volcanic rocks of a very old age .
Uranium-238's decay product uranium 238 has a halflife of 246,000 years and so is useful for determining the age of sediments that are between 100,000 years and 1,200,000 years in age .
In a 704-million-year-old rock , 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1) . In a rock twice as old there will be one 235U atom left for every three 207Pb atoms (Pb/U = 3), and so forth . With 238U the Pb/U ratio grows much more slowly with age, but the idea is the same .
In comparison, the half-life of the radioactive uranium 238 isotope is 4 .5 billion years, which makes it useful for dating extremely old materials . Zircon chronology begins in the field . "You go out and look for relative age relationships, see which rock unit was formed first," says Henry .
The rock could therefore be dated as 4·5 billion years old . You can only use the ratio of uranium-238 to lead to date rock if you are sure that there was no lead originally present in the rock and that all the lead in the rock has come from the decay of uranium . Using Potassium-40 to Date Rock . Some rocks contain the radioisotope potassium-40 . . .
Uranium -lead radiometric dating involves using uranium -235 or uranium-238 to date a substance's absolute age . This scheme has been refined to the point that the error margin in dates of rocks can be as low as less than two million years in two-and-a-half billion years .
As the rock gets older the proportion of lead increases . If half of the uranium-238 has turned into lead-206 the rock will be 4500 million years old . Half life graph showing dating rocks
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Dating Rocks Using Uranium 238