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Chapter 42: Q 5 Conceptual Questions (page 1235)
Are the following decays possible? If not, why not?
Therefore, the decays are explained.
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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is 0.50 hour. What is the half-life of B?
a. Draw energy-level diagrams, similar to Figure , for all nuclei listed in Appendix C. Show all the occu-pied neutron and proton levels.
b. Which of these nuclei are stable? What is the decay mode of any that are radioactive?
Calculate (in ) the total binding energy and the binding energy per nucleon for and for .
137 Cs is a common product of nuclear fission. Suppose an accident spills 550 mCi of 137 Cs in a lab room.
a. What mass of 137 Cs is spilled?
b. If the spill is not cleaned up, how long will it take until the radiation level drops to an acceptable level, for a room this size, of 25 mCi?
The three isotopes
Which of these isotopes would be most useful as a biological tracer? Why?What do you think about this solution?
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