Radon_Part_1_S11

Radon_Part_1_S11 - Radon, Part 1 GLY 4241 - Lecture 9...

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1 Radon, Part 1 GLY 4241 - Lecture 9 Spring, 2011
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2 Radiation Radiation is one of many areas that have become of concern to environmental scientists Radiation comes from two sources Natural processes Man
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3 Natural Radioactivity Two kinds Short lived nuclides formed by cosmic ray interactions with the atmosphere Long lived isotopes that have persisted since planetary formation May be concentrated by natural or anthropogenic processes
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4 Common Long-Lived Isotopes Uranium 235 U 238 U Thorium 232 Th All decay to yield isotopes of lead
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232 Th Decay Series 5
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235 U Decay Series 6
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238 U Decay Series 7
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8 Properties of Radon Colorless, odorless gas Atomic number 86 Permissible Concentration 0.4 x 10 -2 picoCuries/cm 3 , or 4 picoCuries/liter Equivalent to 148 Bq/m 3
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9 Radon Isotopes
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Human Radiation Exposure Source Average annual exposure, mSv/ yr Radon 1.2 Cosmic rays and terrestrial γ rays 1.2 Frequent Flyer 0.5 Diagnostic medical procedures
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Radon_Part_1_S11 - Radon, Part 1 GLY 4241 - Lecture 9...

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