Lec 9 chem 6c

Lec 9 chem 6c - Review Nuclear power Three Miles Island...

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Review Nuclear power Three Miles Island Chernobyl Fusion
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Preview Nuclear Kinetics Uses of radiation The Big Bang Baryon numbers
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Nuclear Kinetics Nuclear decay is first order: Parent atom daughter atom + radiation *Recall that this is an exponential decay. It only depends on which specific isotope is undergoing nuclear decay.
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1 st order reaction kinetics: [X] t = [X] o e -kt For nuclear decay the number of nuclei are used instead of concentration: N = N o e -kt # of radioactive nuclei after time (t) # of radioactive nuclei initially decay constant time
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Because the number of atoms of a specific isotope is proportional to its mass: m = m o e -kt Initial mass Final mass As with any 1 st order reaction the ½ life is: t 1/2 = ln(2 ) / k
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The ½ life of different radioactive isotopes varies significantly: Fermium-244 3.3 ms Carbon-15 2.4 s Iodine-131 8.05 d Cesium-137 30.17 yr (a) Radium-226 1.6 kyr (ka) Carbon-14 5.73 kyr (ka) Uranium-238 4.5 Gyr (Ga) Uranium-238 is so stable that it is used as enhanced armor protection for some Abrams tanks
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The ½ life of radioactive isotopes has a wide range of uses: Date organic remains Follow chemical reactions Treat cancer
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Using radiation that causes cancer to kill cancer? This is the idea behind radiation therapy.
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This note was uploaded on 03/21/2009 for the course CHEM 6C taught by Professor Hoeger during the Spring '08 term at UCSD.

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Lec 9 chem 6c - Review Nuclear power Three Miles Island...

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