The steps below show three of the steps in the radioactive
Chapter , Problem 21.5(choose chapter or problem)
The steps below show three of the steps in the radioactive decay chain for 232 90Th. The half-life of each isotope is shown below the symbol of the isotope. (a) Identify the type of radioactive decay for each of the steps (i), (ii), and (iii). (b) Which of the isotopes shown has the highest activity? (c) Which of the isotopes shown has the lowest activity? (d) The next step in the decay chain is an alpha emission. What is the next isotope in the chain? [Sections 21.2 and 21.4] 1.41 109 yr Th (i) (ii) (iii) 232 90 5.7 yr Rn 228 88 6.1 min Ac 228 89 1.9 yr Th
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