Radioactivity KS4

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Across
  1. 3. The 92nd element (7)
  2. 7. Nuclear power is this type of energy (3,9)
  3. 9. High energy radiation (5,4)
  4. 12. Where you find protons and neutrons in an atom (8)
  5. 13. Which element (Pb) can stop most gamma rays? (4)
  6. 18. Positive particle in an atom which has mass (6)
  7. 19. This is a type of radiation that is a Helium nucleus (5,8)
  8. 20. This non-communicable disease can be treated with gamma rays (6)
  9. 21. This is another way to protect yourself from radiation apart from time and protection (8)
  10. 22. The ability of radiation to remove electrons from atoms (8)
  11. 23. This can stop beta particles (9,4)
Down
  1. 1. Particle in an atom that has mass but no charge (7)
  2. 2. The time it takes for half of the particles of an element to decay (4,4)
  3. 4. An element with more or less electrons than natural (3)
  4. 5. A machine that measures radioactive particles (6,7)
  5. 6. The type of nuclear reaction that occurs in the sun (6)
  6. 8. These safety devices use alpha emitters to detect smoke (5,5)
  7. 10. This is high energy electrons (4,8)
  8. 11. A form of an element with a different number of neutrons (7)
  9. 14. A word that means when an atom breaks apart (5)
  10. 15. This is a word that describes what happens to unstable atoms (13)
  11. 16. What can stop alpha particles (5)
  12. 17. The splitting of an atom (8)