Nuclide A has a half-life that is one-third that of nuclide B. The type A sample starts with twice the number of undecayed nuclei as in the sample of type B. Compare the initial sample activities expressed as a ratio of the activity of sample A to that of B.
Answer to relevant QuestionsUsing the general guidelines for nuclear stability, explain why aluminum has only one stable isotope (27Al). In other words, why aren’t isotopes of aluminum, such as 28Al or 26Al, stable? If X- rays and slow neutrons give the same effective dose, how will their doses compare? Write the nuclear equations for (a) The alpha decay of 237Np, (b) The decay of 32P, (c) The decay of 56Co, (d) Electron capture in 56Co, and (e) The decay of 42K from an excited nuclear state to the ground state (not ...At present, a radioactive beta source with a long half-life has an activity of 20 mCi. (a) What is the present decay rate in decays per second? (b) Assuming that one beta particle is emitted per decay, how many are ...(a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? (b) How long will it take for the activity of a sample of 17F to decrease to of its initial value? (c) Repeat part (b), but instead ...
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