bioex_lect32

bioex_lect32 - MIT OpenCourseWare http/ocw.mit.edu 5.111...

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MIT OpenCourseWare http://ocw.mit.edu 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Kinetics of Elementary Reactions: Radioactive Decay See lecture 31 for an introduction to kinetics and lecture 32 for the kinetics of radioactive decay. Radioactive Decay. The decay of a nucleus is independent of the number of surrounding nuclei that have decayed. We can apply first order integrated rate laws: [A] = [A] 0 e -k t and t 1/2 = 0.6931 k However, instead of concentration, the first order integrated rate law is expressed in terms of N (number of nuclei): N = N o e -k t k decay constant t time N 0 number of nuclei originally present Nuclear kinetics – monitor rate of occurrence of decay events with a Geiger counter (radiation detector). Decay rate is also called Activity (A) N = N o e -k t can be expressed as A = A o e -k t A Activity A o initial Activity Example from pg 3 of Lecture 32 notes: Medical Applications of Radioactive Decay.
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bioex_lect32 - MIT OpenCourseWare http/ocw.mit.edu 5.111...

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