Radioactive Emissions

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Across
  1. 3. number of protons
  2. 6. protons + neutrons
  3. 10. when radioactive material gets inside the body or on the skin
  4. 11. the frequencies of radiation absorbed when excited electrons move to higher energy levels
  5. 13. the time taken for half the nuclei in a sample to decay
  6. 14. radiation consisting of a fast moving electron
Down
  1. 1. radiation consisting of 2 protons and 2 neutrons
  2. 2. high frequency electromagnetic wave
  3. 4. the frequencies of radiation emitted by an atom when electrons move to lower energy levels
  4. 5. a packet of electromagnetic energy
  5. 7. the unit of activity
  6. 8. when radiation from outside the body hits it
  7. 9. An atom with the same number of protons but different number of neutrons
  8. 12. the radiation we are exposed to all the time