Answer the following question given this paragraph: 

There are several types of radioactive decay, including alpha, beta, and gamma decay. In all three types, nuclei emit radiation, but the nature of the radiation differs. The Table below shows the radiation emitted in each type of decay. You can watch a video about the three types at this URL: http://www. youtube. com/watch?v=3koOwozY4oc .


Q: What is emitted by nuclei in alpha, beta, and gamma decay?

 Choices:

- convection

- solar energy

- magnetic field

- radiation

A:
radiation
