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Chapter 31: Q21PE (page 1149)
Electron capture by 7Be
The 尾- Decay equation of 7Be is \(_4^7B{e_3} + {e^ - } \to _3^7L{i_4} + {\nu _e}\).
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Confirm that charge, electron family number, and the total number of nucleons are all conserved by the rule for electron capture given in theequation \(_Z^A{X_N} + {e^ - } \to _{Z - 1}^A{Y_{N + 1}} + {v_e}\). To do this, identify the values of each before and after the capture.
\({{\rm{\beta }}^{\rm{ + }}}\)decay of \(^{{\rm{52}}}{\rm{Fe}}\)
A 5000-Ci \({}^{60}Co\) source used for cancer therapy is considered too weak to be useful when its activity falls to 3500 Ci. How long after its manufacture does this happen?
There is more than one isotope of natural uranium. If a researcher isolates \(1.00\,{\rm{mg}}\) of the relatively scarce\({}^{{\rm{235}}}{\rm{U}}\) and finds this mass to have an activity of \(80.0\,{\rm{Bq}}\), what is its half-life in years?
(a) Calculate the activity \({\rm{R}}\) in curies of \(1.00\,{\rm{g}}\) of \({}^{{\rm{226}}}{\rm{Ra}}\). (b) Discuss why your answer is not exactly \(1.00\,{\rm{Ci}}\), given that the curie was originally supposed to be exactly the activity of a gram of radium.
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