Question

Calculating Absolute Ages:

Daughter Isotope Lead-210O Polonium-218 Xenon-131 Yttrium-90 Nitrogen-14 Uranium-235 Thorium-231 Thorium-234 Half Life [approximate] 0.00016 seconds 4.0 days Type of Decay Parent Isotope Polonium-214 Radon-222 lodine-131 Strontium-90 Carbon-14 Plutonium-239 Uranium-235 Uranium-238 Alpha Beta Beta Beta 8.0 da 30.0 years 5,730 years 24,000 years 704,000,000 years 4,500,000,000 years Alpha Alpha A meteorite from Mars is found on the surface of a glacier in Antarctica. You take it back to the lab and measure 96.875 grams of Thorium-231 for every 3.125 grams of Uranium-235. How long ago did the meteorite strike the Earth?

Answer 1

Here the sample has undergone 5 complete half-lifes, so the age is 704000000*5.

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