What is an activation product, and in what setting is it typically encountered?

• A. A radioactive nuclide produced by gamma irradiation of air; common in radiography rooms.
• B. A nuclide produced by radioactive decay of other isotopes; common in hospitals.
• C. A radioactive nuclide produced by neutron activation of materials; common in reactors, accelerators, or spaces with neutron flux.
• D. A product only produced in space missions.

Answer: (C)