radiation

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Across
  1. 2. Atoms with different numbers of protons and electrons (3: I...)
  2. 4. The power of radiation to knock electrons off atoms (8: I...)
  3. 8. A particle with charge = +1 and mass = 1 (6: P...)
  4. 9. A few m of this stops gamma radiation (4: L...)
  5. 12. Discovered the electron and plum pudding model of the atom (7: T...)
  6. 14. The unit of radioactive activity (8: B...)
  7. 15. The meaning of "G" in the GM tube (6: G...)
  8. 17. The experiment which proved the nuclear model (Alpha ________) (10: S...)
  9. 18. A particle with charge = 0 and mass = 1 (7: N...)
  10. 21. The charge of a proton (8: P...)
  11. 22. Discovered the nuclear model of the atom (10: R...)
  12. 24. uThe presence of unwanted materials containing radioactive atoms or other materials (13: C...)
  13. 27. The time taken for the radioactivity to half (8: H...)
  14. 31. Formed by beta decay of 14-C (8: N...)
  15. 33. A few cm of this stops beta radiation (9: A...)
  16. 34. A few mm of this stops alpha radiation (5: P...)
  17. 35. The meaning of "M" in the GM tube (6: M...)
  18. 37. Another name for an electron energy level (5: S...)
Down
  1. 1. The atom is ten _________ times bigger than the nucleus (8: T...)
  2. 3. The charge of an electron (8: N...)
  3. 5. The same thing as a beta particle (8: E...)
  4. 6. Atoms with the same number of protons but different numbers of neutrons (7: I...)
  5. 7. Where mass is concentrated in the atom (7: N...)
  6. 10. Discovered electron energy levels (4: B...)
  7. 11. The power of radiation to pass through a material (11: P...)
  8. 13. The alpha particle is a nuclei of this element (6: H...)
  9. 16. Formed by alpha decay of 14-C (9: B...)
  10. 19. Electrons move to lower energy levels, which releases light (8: E...)
  11. 20. The decay of radioactive nuclei is…. (6: R...)
  12. 23. This disease can be caused by radiation (6: C...)
  13. 25. Light moves electrons to higher energy levels (10: A...)
  14. 26. The process of exposing an object to nuclear radiation. The object does not become radioactive (11: I...)
  15. 28. The radiation used to treat cancers (5: G...)
  16. 29. The radiation used to measure wallpaper thickness (4: B...)
  17. 30. Formed by gamma decay of 60-Ni (6: N...)
  18. 32. The charge of a neutron (7: N...)
  19. 36. The radiation used in smoke alarms (5: A...)