The History of Radioactivity

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Across
  1. 2. The award that Henri and Marie won.
  2. 4. Nuclear disaster that occured in 1986 in Ukraine at a nuclear power plant.
  3. 5. The process in which a nucleus breaks down an atom.
  4. 6. Man who discovered radioactivity.
  5. 8. The spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction.
  6. 12. The penetrating rays and particles emitted by a radioactive source.
  7. 13. Polish woman who was famous for her pioneering research on radioactivity.
  8. 17. The year when radioactivity was discovered.
  9. 19. The main material that radiocarbon is used to date.
Down
  1. 1. The material that Henri was working with when he discovered radioactivity.
  2. 3. A common building material that can be dated by radiocarbon dating.
  3. 5. Over time the amount of C-14 in the material _________.
  4. 7. The dating method used to date organic materials.
  5. 9. Atoms of the same elemeent with different number of neutrons (and mass).
  6. 10. Radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons.
  7. 11. Radiation used by doctors to determine bone structure.
  8. 14. A basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.
  9. 15. The process of combining nuclei to produce a nucleus of greater mass.
  10. 16. The splitting of a nucleus into smaller fragments, accompanied by the release of neutrons and a large amount of energy.
  11. 18. How old the oldest artifacts that radiocarbon dating can be.