The document is a quiz about alpha, beta, and gamma radiation. It asks 20 multiple choice questions about the properties and applications of the three types of radiation. Alpha radiation has the greatest mass, is made up of neutrons and protons, has a positive charge, and is stopped by paper. Beta radiation has a negative charge, is deflected by magnetic fields, and is used to measure thickness of materials. Gamma radiation travels at the speed of light, has no mass or charge, and is used for medical imaging and sterilization.