Answer:
Alpha particles
Step-by-step explanation:
When plutonium radioactively decays to uranium, an alpha particle results.
Alpha particles are similar in nature to a Helium cation in that they have a nucleus made up of 2 protons and 2 neutrons. They are the only type of radiation with an atomic number of 2.
If Pt-94 breaks down to U-92, a loss of 2 protons result and it will be balanced by the alpha particle produced.