Radioactivity

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Across
  1. 2. the number of decays per second in a radioactive source
  2. 7. describes the unpredictable nature of radioactive decay
  3. 8. radiation that surrounds us from both natural and man-made sources
  4. 11. material placed between a source and detector to test penetration
  5. 13. exposure to radiation without contact with material
  6. 14. what a Beta particle is
  7. 17. the amount of mass that a gamma ray has
  8. 18. time taken for activity or number of unstable nuclei to drop by half
  9. 21. the name for the process of when an unstable nucleus emits nuclear radiation
  10. 22. emitted in one of the four main radiation types besides alpha, beta, and gamma
  11. 24. high-energy electromagnetic radiation from the nucleus
  12. 27. the process of knocking an electron off an atom
  13. 29. this material will easily absorb alpha particles
  14. 31. detector commonly used to measure ionising radiation
  15. 32. the name for the radioactive material injected into the blood stream
  16. 33. finding the age of something is called radioactive _______ or carbon _______
  17. 35. radioactive material being deposited on surfaces
Down
  1. 1. a few mm of this will material will absorb beta particles
  2. 3. the number of protons in an alpha particle
  3. 4. something that can detect ionising radiation
  4. 5. positively charged particle inside the nucleus
  5. 6. when measuring the activity of a radioactive source you must _______ the activity due to background radiation
  6. 9. the reason a nucleus emits radiation is because it is ________
  7. 10. the unit of radioactive activity
  8. 12. this uses an alpha source to warn people of a fire
  9. 15. the total amount of protons and neutrons
  10. 16. several cm of this material is needed to absorb gamma radiation
  11. 19. radiation consisting of a fast-moving electron
  12. 20. type of background radiation originating from space
  13. 23. the ability of radiation to pass through materials
  14. 25. central region of an atom containing most of its mass
  15. 26. atoms with same number of protons but different numbers of neutrons
  16. 28. neutral particle found in the nucleus
  17. 30. radiation consisting of two protons and two neutrons
  18. 34. ionising radiation can cause a living cell to _________