In your job as a health physicist, you measure the
Chapter 43, Problem 43.7(choose chapter or problem)
In your job as a health physicist, you measure the activity of a mixed sample of radioactive elements. Your results are given in the table. Time (h) Decays,s 0 7500 0.5 4120 1.0 2570 1.5 1790 2.0 1350 2.5 1070 3.0 872 4.0 596 5.0 404 6.0 288 7.0 201 8.0 140 9.0 98 10.0 68 12.0 33 (a) What minimum number of different nuclides are present in the mixture? (b) What are their half-lives? (c) How many nuclei of each type are initially present in the sample? (d) How many of each type are present at t = 5.0 h?
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