radiometric dating problems
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Radiometric Dating Question?
Let's say we find a mineral that should have contained uranium when it formed, but should not have contained any lead. We take this mineral into the labratory and measure the amount of uranium-235 and lead-207 in this mineral. We find that it contains 62.5 grams of uranium-235 and 937.5 grams of lead-207. Assuming that there are no problems with the measurement and that all of the lead results from radioactive decay, how old is that mineral?
You must be in my class. G345U? I found this, which I think is helpful:
As an example, a pure 100 gram sample of radioactive Uranium 235 (U235) would decay into 50 grams of U235 and 50 grams of non-radioactive Lead 207 (Pb207) in about 713 million years, and then to 25 grams of U235 and 75 grams of Pb207 in another 713 million years (a total of 1,426 million years for those two half-lives).
so... we just have to do that backwards, I think, and get the number of half-lives. If you multiply the number of grams of uranium that we have by 2, and then take the difference of those two values and subtract it from lead, you go back one half life. I think.
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