Across
- 6. Radiation that is always around us
- 7. How long it takes for radioactivity to halve
- 8. Stops Beta
- 9. Made of two protons and two neutrons
- 12. Radioactive gas released from rocks
- 14. Same number of protons, different number of neutrons
- 15. A work that describes a radioactive nucleus
- 17. Made of an electron
Down
- 1. When an object receives radiation
- 2. When an object has radioactive material on it or in it
- 3. Name of the device that measures radioactivity
- 4. Unit for count rate
- 5. When an atoms loses or gains an electron
- 10. Stops Alpha
- 11. Stops Gamma
- 13. Where radiation comes from
- 16. Made of an EM wave