Radiation and Decay Equations

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Across
  1. 6. During beta decay the atomic number increases by ____
  2. 8. During alpha decay the atomic number decreases by ____
  3. 9. During alpha decay the mass number decreases by ____
  4. 10. The time taken for the number of radioactive isotopes in a sample to halve
  5. 12. Rate at which an unstable atom decays
  6. 14. Alpha radiation is a _____ nucleus
  7. 15. During beta decay a _____ changes into a proton and electron
  8. 17. Exposure to radiation
  9. 18. Positive charge of alpha radiation
  10. 20. During beta decay the mass number stays the _____
Down
  1. 1. Number of decays recorded each second by a detector
  2. 2. ____ power describes how easy it is for radiation to pass through a material
  3. 3. Charge of beta radiation
  4. 4. Mass of alpha radiation
  5. 5. Unit of activity
  6. 7. The presence of unwanted radiation
  7. 11. Heaviest type of radiation
  8. 13. Atoms that are radioactive are said to be _____
  9. 16. Radioactive decay is ______
  10. 17. ____ power describes how easy it is for radiation to damage atoms
  11. 19. Radiation that is an electromagnetic wave