Revision Crossword

12345678910111213
Across
  1. 2. Used in smoke detectors.
  2. 4. 1/3 that makes up an atom. Has a positive charge.
  3. 5. Gives off ionising radiation or particles.
  4. 8. An alpha particle is lost from the nucleus.
  5. 9. Measures the radiation in the surrounding air.
  6. 11. A proton or a neutron.
  7. 12. Act or process of changing.
  8. 13. Used to measure thickness.
Down
  1. 1. A neutron splits into two smaller particles.
  2. 3. The number of protons/electrons in a neutral atom.
  3. 4. Making way through something.
  4. 6. A type of background radiation that makes 51%.
  5. 7. The time taken for the count rate of a radio isotope to halve.
  6. 9. This is used for fault detection.
  7. 10. One in every 10,000,000 carbon isotope is...