Lec088304b

Lec088304b - decay After n-half-lives, the fraction of the...

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Heat Sources for Melting of Primitive Earth Unstable Nuclides and Gravitational Compression
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Belt of Stability All nuclides that lie outside this belt are unstable and undergo nuclear reactions until they become a stable nuclide. Stable nuclides have N/Z ratios from 1 to 1.52.
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Radioactivity Process in which an unstable nucleus is ultimately converted to a stable nucleus by means of nuclear reactions All nuclei having Z > 83 and a few having Z < 83 are unstable The emission of energetic particles during a nuclear change is called radiation
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Types of Radiation Buell/Girard, "Chemistry", Prentice Hall, NJ,1994, 152
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Tro, 185 *Ionizing power- ability of radiation to create ions by knocking electrons off molecules in the matter through which the radiation travels * Natural Radiation
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http://www.princeton.edu/~ehs/radtrain/Modules/basics.html Penetrating Power
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Equations for Natural Radioactivity Alpha Radiation Beta Radiation Gamma Radiation
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Half-Life Half-life is the time required for half of the radioactive nuclei in a sample to
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Unformatted text preview: decay After n-half-lives, the fraction of the original radioactive nuclei still remaining is 1/2 n Half-life 1/2 n n Joesten et al, Chemistry: Impact on Society, Saunders, NY, 1988, 68. Joesten/Wood, &quot;World of Chemistry,2nd, Saunders,PA, 1996,122 Estimating the Age of Rocks Based on U to Pb Decay Tro, 202 Oldest rocks found on surface of Earth contain 50%U and 50% Pb. Estimate the age of planet Earth Estimating Ages of Materials that Contain Carbon * * Half-life = 5730 yr Object Tro, 200 Carbon Dating Radioactive Decay and Heating of Primitive Earth The shorter the half-life, the faster a nuclide decays Radiation is accompanied by a release of heat energy Unstable nuclides formed during a supernova decayed at a rapid rate, released much heat which contributed to the melting of planet earth Heating of Earth Due to Gravitational Compression Miller, F.M., Chemistry,: Structure and Dynamics, McGraw-Hill, NY, 1984, 715...
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Lec088304b - decay After n-half-lives, the fraction of the...

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