Fill in the Blank. 1. You want to be shielded from all three types of nuclear radiation. If you find shielding that blocks _________________ radiation, then it will most likely also block the other two types. 2. When nuclear radiation enters the tube of a Geiger counter, it ____________________ the atoms of the gas contained in the tube. 3. The particles that make up protons and neutrons and are thought to be basic units of matter are ____________________.