Radioactivity 2

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Across
  1. 2. Fraction used to determine half- life
  2. 4. Radioactive gas
  3. 7. Initial activity if after three half-lives activity is 10 Bq
  4. 8. Type of film that can detect radiation
  5. 10. Unit of radioactivity
  6. 11. G in GM tube
  7. 12. Type of radiation that is always present
  8. 14. Final activity after one half-life, if initial activity was 16 Bq
  9. 17. Radiation from space
  10. 18. Effect of alpha, beta and gamma radiation on atoms
  11. 19. Nuclei with different mass numbers
  12. 20. Goes with Geiger
  13. 22. Initial activity if after one half-life activity is 9 Bq
  14. 23. Final activity after three half-lives, if initial activity was 96 Bq
Down
  1. 1. Discovered by Becquerel
  2. 3. 3600 seconds
  3. 5. Number of half-lives for activity to fall from 56 Bq to 7 Bq
  4. 6. Charged particle
  5. 7. Number of half-lives for activity to fall from 32 Bq to 2 Bq
  6. 9. What happens to the activity of a source over time
  7. 13. Type of radiation that does not occur naturally
  8. 15. Number of half-lives for activity to fall from 24 Bq to 6 Bq
  9. 16. Final activity after two half-lives, if initial is 36 Bq
  10. 21. Initial activity, if after two half-lives activity is 4 Bq