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