Actinium-227 decays by alpha decay or beta decay and is part of a long decay sequence, shown in Fig. 29.8. Write all the possible nuclear decays for the decay series from 227Ac to 215Po. Identify the daughter nucleus at the end of each decay.
Answer to relevant QuestionsThe decay series for neptunium-237 is shown in Fig. 29.20. (a) What is the decay mode of each of the sequential decays? (b) Determine the daughter nucleus at the end of each decay. A sample of technetium-104, which has a half-lfe of 18.0 min, has an initial activity of 10.0 mCi. Determine the activity of the sample after exactly 1 h has elapsed. Francium-223 (22387FR) has a half-life of 21.8 min. (a) How many nuclei are initially present in a 25.0-mg sample of 22387FR? (b) What is its initial activity? (c) How many nuclei will be present 1 h and 49 min later? ...The total binding energy of 21H is 2.224 MeV. Use this information to compute the mass (in u) of a 2H nucleus from the known mass of the proton and the neutron. Suppose an alpha particle could be removed intact from an aluminum-27 nucleus (m = 26.981 541 u). (a) Write the equation that represents this process and determine the daughter nuclide. (b) If the daughter nuclide has mass ...
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