atomic radiation

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Across
  1. 1. The time taken for activity to halve.
  2. 3. Uncharged particle emitted from the nucleus.
  3. 8. Unwanted presence of radioactive atoms.
  4. 10. Nuclear radiation identical to helium nuclei.
  5. 11. The rate at which decay happens.
  6. 12. Fast moving electrons ejected from the nuclei of atoms.
Down
  1. 2. Process of exposing material to nuclear radiation
  2. 4. The number of decays per second.
  3. 5. The giving out of radiation.
  4. 6. Type of radiation that can add or remove electrons from an atom.
  5. 7. Condition of an atom before it decays.
  6. 9. Electromagnetic radiation from the nucleus.