Radiation

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Across
  1. 2. least penetrating source of radiation
  2. 4. alpha is used in this type of detector
  3. 6. time taken for activity to reduce by half
  4. 7. an EM wave
  5. 9. alpha is the most
  6. 10. beta has this type of charge
Down
  1. 1. this is what happens to sources over time
  2. 3. an alpha particle is made of this type of nucleus
  3. 5. stopped by aluminum
  4. 8. the number of decays per second