4_half_life___carbon_dating_1.pptx

# 4_half_life___carbon_dating_1.pptx - A decay series Often...

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A decay series Often the product of one radioactive decay is also radioactive – this produces a radioactive decay series Try and work out the ??????s He Th e U He Pa He Np e Am Pu 4 2 229 90 0 1 233 92 4 2 233 ? 4 2 237 93 0 1 241 95 241 94      ? ? ? ? ? ? ? 229 ? ? ? ? 92 4 2 233 ? ? 2 237 93 ? 1 241 ? 241 94      U Pa He e Am Pu

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Decay Series A decay series occurs when one radioactive isotope decays to another radioactive isotope, which decays to another, and so on. This allows the creation of nuclei that otherwise would not exist in nature.

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The “half-life” (h) is the time it takes for half the atoms of a radioactive substance to decay. For example, suppose we had 20,000 atoms of a radioactive substance. If the half-life is 1 hour, how many atoms of that substance would be left after: 10,000 (50%) 5,000 (25%) 2,500 (12.5%) 1 hour ? 2 hours ? 3 hours ? Time #atoms remaining % of atoms remaining Half-Life

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Example for; N o = 100 nuclei T 1/2 = 5 days Nuclei remaining as a function of time Time (days) 0 20 40 60 80 100 0 5 10 15 Decay curves 2 1 0 2 1 ln T k e N N N dt dN kt
See PhET alpha-decay applet

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• Fall '16
• Selba

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