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Chapter 31: Q20 PE (page 1149)
\({{\rm{\beta }}^{\rm{ + }}}\)decay of \(^{{\rm{52}}}{\rm{Fe}}\)
The \({\beta ^ - }\) Decay equation of \(^{52}Fe\)is \(_{26}^{52}F{e_{26}} \to _{25}^{52}M{n_{27}} + {\beta ^ + } + {\nu _e}\).
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Star Trek fans have often heard the term “antimatter drive.” Describe how you could use a magnetic field to trap antimatter, such as produced by nuclear decay, and later combine it with matter to produce energy. Be specific about the type of antimatter, the need for vacuum storage, and the fraction of matter converted into energy.
(a) Write the complete \({\rm{\alpha }}\) decay equation for \(^{249}Cf\).
(b) Find the energy released in the decay.
If a \(1.50\,{\rm{cm}}\)-thick piece of lead can absorb \({\rm{90}}{\rm{.0 \% }}\) of the \({\rm{\gamma }}\) rays from a radioactive source, how many centimeters of lead are needed to absorb all but \({\rm{0}}{\rm{.100 \% }}\) of the \({\rm{\gamma }}\) rays?
Suppose the range for5.0 MeVα ray is known to be2.0mmin a certain material. Does this mean that every5.0 MeVα a ray that strikes this material travels 2.0mm , or does the range have an average value with some statistical fluctuations in the distances traveled? Explain.
: βdecay producing137Ba. The parent nuclide is a major waste product of reactors and has chemistry similar to potassium and sodium, resulting in its concentration in your cells if ingested.
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