# What is the half life of Uranium 234?

I discovered the following information online:

Physical Review, vol. 70, Issue 9–10, pp. 580–582; Chamberlain, Owen; Williams, Dudley; Yuster, Philip. Half-Life of Uranium (234)

"The half-life of U234 has been determined by two independent methods. The first method involves a re-measurement of the relative isotopic abundance of U234 and U238 in normal uranium; from this measurement the half-life of U234 can be obtained in terms of the known half-life of U238. The value obtained by this method is 2.29+/-0.14×105 years. The second method involves the determination of the specific α-activity of U234 from the total specific α-activity and relative isotopic abundances of several enriched uranium samples. The value obtained by this method is 2.35+/-0.14×105 years. Both values for the half-life are somewhat smaller than the currently accepted value of 2.69+/-0.27×105 years. DOI: 10.1103/PhysRev.70.580"

This comes out to be approximately 245,250 years, give or take 490 years. Keep in mind that half life is a measurement of how long it takes for half of the radioactive sample to decay into a non-radioactive substance; it is not constant. The majority of the material may decay within the first few years, and the remaining portion may take thousands of years to decay.

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The half-life of Uranium-234 (U-234) is approximately 246,000 years.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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