3. (20 points) The radioisotope 224Ra decays by alpha emissi…
3. (20 points) The radioisotope 224Ra decays by alpha emission via two paths to the ground state of its daughter: 94% probability of alpha decay directly to the daughter ground state; 5% probability of alpha decay to an excited state before emitting a 0.241 MeV photon in an isomeric transition to reach the ground state of the daughter. Write the reaction equation for the alpha decay of 224Ra (4 points) Do not type this response into Canvas. Only include on scratch paper. Calculate the Q-value (in MeV) of this reaction. (4 points) What are the energies (in MeV) of the two associated alpha particles from the two decay modes? (6 points) Sketch the decay scheme for the decay of 224Ra with the associated probabilities, energies, and emissions for the alpha decays and any accompanying photons clearly labeled (6 points). Do not type this response into Canvas. Only include on scratch paper.
Read Details4. (20 points) A sample extracted from the tooth of a deceas…
4. (20 points) A sample extracted from the tooth of a deceased cow contains 12.4-mg 90Sr (t1/2=28.8 y). a) (2 points) Briefly describe where 90Sr comes from and how it would end up in the tooth of a cow? Do not type this response into Canvas. Only include on scratch paper. b) (5 points) What is the activity of 90Sr present? c) (6 points) If the extracted sample is in equilibrium with the 90Y daughter (t1/2 = 64.0hr) what is the mass of 90Y in the sample? d) (7 points) If 90Sr only is isolated from a new sample without any 90Y initially present, what will be the mass of 90Y in the new sample ~58 years after isolation? What will be the total activity of the sample from both the parent and daughter 58 years after isolation?
Read Details