Nuclear Radiation 11He

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Across
  1. 4. The least ionising type of radiation
  2. 5. The time taken for the radioactivity of a sample to halve
  3. 6. Negative particle in an atom
  4. 8. Uses beta radiation
  5. 11. Radiation which can penetrate paper but not aluminium
  6. 12. The splitting of large radioactive nuclei to release energy
  7. 14. The joining of small nuclei to release energy in stars
Down
  1. 1. Radiation consisting of two protons and two neutrons
  2. 2. Uses alpha radiation
  3. 3. Unit of radioactivity
  4. 7. Neutral particle in an atom's nucleus
  5. 9. Positive particle in an atom's nucleus
  6. 10. Radiation which can turn atoms into ions
  7. 13. First scientist to use the word radioactive