(a) Compute the alpha decay energy Kα for the radium isotopes 218, 220, and 222. (b) The curves in Figure 12.13 can be approximated by straight lines. Use the results of part (a) for 222Ra and 218Ra along with the half-lives given in Appendix 8 to write an equation that gives t1/2 as a function of Kα. (c) Check the function you found in part (b) by seeing how well it predicts the half-life of 220Ra.
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