6. What is gamma radiation blocked by?
- Thick wood
- Thick lead
- A few metres of glass
- Any type of thick metal
7. How many neutrons does an alpha particle have?
- 1
- 4
- 2
- 6
8. What blocks beta radiation?
- 3cm of air
- Sheet of felt
- Thin sheet of aluminium
- Slightly thick sheet of paper
9. Which type of radiation is stopped by paper and air?
- Alpha
- Beta
- Gamma
10. Which of these answers is a correct example of where background radiation comes from?
- Sound waves
- Rocks
- Pollen
- Water
