140 is a positron emitter dec y - rays have an energy of 2.313
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- Many radioisotopes have important industrial, medical, and researchapplications. One of these is Cobalt-60, which has a half-life of 5.20 years anddecays by the emission of a beta particle (energy 0.31 MeV) and two gammaphotons (energies 1.17 MeV and 1.33 MeV). A scientist wishes to prepare aCobalt-60 sealed source that will have an activity of at least 10 Ci after 30months of use. a. What minimum initial mass of Cobalt-60 is required? b. At what rate will the source emit energy after 30 months?99Mo beta decays with a half-life of 66 h to 99Tc*, an isotope that is widely used in medical imaging. The 99Mo itself is created in a nuclear reactor by bombarding 235U nuclei with neutrons. One particular 99Mo was created in this way 66 h ago, while another was created just now. Which nucleus is morelikely to decay in the next 66 h?5. An XPS with an instrument work function of 4.5eV was used to analyze a surface. An observed kinetic energy of 795.2 eV was observed when a(n) MgKα (1253.6 eV) X-ray source was used. What was the binding energy of the electron coming from this surface?
- Find the energy released in the alpha decay of 22688Ra (226.025402 u). (Hint: 22286Rn has a mass of 222.017571 u.)The half-life of 198Au is 2.70 days. What is the decay constant of 198Au?A radioactive sample of an isotope with a half-life of 24 hours has an activity of 3×10^5 Bq when delivered to a physics lab. What is the activity of this isotope exactly 14 hours later when it is to be used in an experiment?