Radiation and Nuclear Crossword

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Across
  1. 2. When two atoms have the same number of protons but different numbers of neutrons
  2. 6. Used to steralise medical equipment in hospitals
  3. 10. Time taken for activity of sample to halve
  4. 11. Charged subatomic particle inside a nucleus
  5. 12. A nucleon is either or proton or a ...
  6. 13. The process used to measure the age of old things containing wood
  7. 14. When fired at U-235 caused fission
  8. 15. Material used to make nuclear weapons
  9. 16. The number of nucleons inside a nucleus
  10. 18. The nucleus an alpha particle is made from
Down
  1. 1. The number of protons in an atom
  2. 3. Rutherford found the nucleus at the centre of the atom was positive and ...
  3. 4. Process inside nuclear bombs which makes them use up fuel quickly
  4. 5. Material rutherford fired alpha particles at
  5. 7. Most ionising type of radiation
  6. 8. Passes through paper
  7. 9. Charge of an alpha particle
  8. 17. Everyday use of radiation used in most buildings
  9. 19. What beta particles are made of