Across
- 2. Used in smoke detectors.
- 4. 1/3 that makes up an atom. Has a positive charge.
- 5. Gives off ionising radiation or particles.
- 8. An alpha particle is lost from the nucleus.
- 9. Measures the radiation in the surrounding air.
- 11. A proton or a neutron.
- 12. Act or process of changing.
- 13. Used to measure thickness.
Down
- 1. A neutron splits into two smaller particles.
- 3. The number of protons/electrons in a neutral atom.
- 4. Making way through something.
- 6. A type of background radiation that makes 51%.
- 7. The time taken for the count rate of a radio isotope to halve.
- 9. This is used for fault detection.
- 10. One in every 10,000,000 carbon isotope is...