Section 6: radiation

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Across
  1. 4. I have a negative charge and move quickly
  2. 8. exposure to radiation
  3. 9. a radiation that doesn't penetrate
  4. 12. naturally occurring radioactive material and particles from space give rise to this form of radiation
  5. 13. too many or too few neutrons
Down
  1. 1. the time taken for the activity to decrease by a factor of 1/2
  2. 2. joining small nuclei, the source of energy in stars
  3. 3. nuclei broken apart in a controlled chain reaction to produce heat and energy
  4. 5. I contain radioactive atoms but shouldn't. I am ......
  5. 6. A massless form of ionising radiation
  6. 7. because of these errors in genetic code cells divide uncontrollably and cause cancer
  7. 10. 2 electrons, 2 protons and 2 neutrons
  8. 11. an atom will decay and give out radiation if it is ......