Radioactivity Revision Crossword

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Across
  1. 4. Recording when a radioactive source is used, and what for
  2. 5. This type of radiation can be stopped by a sheet of paper
  3. 6. Electrons are found in an atom's ...
  4. 8. When radiation is used to follow an unseen structure, such as inside the body
  5. 11. Measures actual damage done to a body - takes the type of radiation into account
  6. 14. Radiation is dangerous because it is...
  7. 17. When a nucleus splits to release 2 daughter nuclei and neutrons
  8. 18. The location of protons and neutrons in an atom
  9. 20. Complete the sentence - "The moderator _ _ the neutrons in a nuclear reactor."
  10. 21. The number of nuclei decaying per second in a radioactive source
  11. 22. One of these is needed to induce Uranium-235 to split
  12. 23. The is divided by the mass of a body to give the absorbed dose
  13. 24. Nuclear reactor control rods are made out of these
  14. 25. Used as a protective shield around a nuclear reactor
Down
  1. 1. High energy electromagnetic wave
  2. 2. Used as the moderator inside a nuclear reactor
  3. 3. The process when an atom gains or loses an electron to become a charged ion
  4. 7. These contain the uranium fuel for a nuclear reactor
  5. 9. Radiation from this needs to be subtracted from any readings to get the corrected count rate
  6. 10. If a nucleus has more than this many protons it can never be stable
  7. 12. Complete the sentence. "To reduce radiation dose, limit exposure, add shielding, and increase _"
  8. 13. Complete the sentence - "The half-life of a tracer wants to be as _ as possible"
  9. 15. The time taken for the amount of a radioactive source to decrease by one half
  10. 16. Gamma is used as a tracer because it is the most ...
  11. 19. Name given to treatment for cancer using gamma rays
  12. 24. This type of radiation is a very fast electron