lecture 6

lecture 6 - 1/17/2012 Lecture 1 1 Health Physics Principles...

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Unformatted text preview: 1/17/2012 Lecture 1 1 Health Physics Principles EEE 498, EEE 591 Lecture 6 Radiation Sources: Naturally Occurring Radioactivity, Serial Transformation Spring 2012, ASU R. Metzger, rlmetzger@asu.edu, GWC 387 Radioactive Series Thorium series (4n), naturally occurring Neptunium series (4n+1), artificial Uranium Series (4n+2), naturally occurring Actinium (4n+3), naturally occurring All disintegrations are accomplished by the emission of either an alpha or beta particle. Lecture 6 2 1/17/2012 Lecture 1 2 Thorium (Th-232) Series Lecture 6 3 Lecture 6 4 1/17/2012 Lecture 1 3 Neptunium (Np-237) Series Lecture 6 5 Lecture 6 6 1/17/2012 Lecture 1 4 Uranium (U-238) Series Lecture 6 7 Lecture 6 8 1/17/2012 Lecture 1 5 Actinium (U-235) Series Lecture 6 9 Radioactive Decay Chains Diagram Lecture 6 10 1/17/2012 Lecture 1 6 Naturally Occurring Radioactive Series The first member of each series is very long- lived: 4n: T( 232 Th) = 1.39x10 10 y 4n+2: T( 238 U) = 4.51x10 9 y 4n+3: T( 235 U) = 7.13x10 8 y Earth age: 4.54 10 9 y Each has a radon isotope member: 4n ( 232 Th): 220 Rn, thoron 4n+2 ( 238 U): 222 Rn, radon 4n+3 ( 235 U): 219 Rn, actinon Lecture 6 11 Naturally Occurring Radioactive Series The end product in each case is lead: 4n ( 232 Th): 208 Pb 4n+2 ( 238 U): 206 Pb 4n+3 ( 235 U): 207 Pb Lecture 6 12 1/17/2012 Lecture 1...
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lecture 6 - 1/17/2012 Lecture 1 1 Health Physics Principles...

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