RADIOACTIVITY KEY TERMS

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Across
  1. 2. One of the subatomic particles. Positively charged
  2. 5. a positively charged particle made up of 2 protons and 2 neutrons
  3. 7. the emission of energy as electromagnetic waves or as moving subatomic particles
  4. 9. A general term denoting the quantity of radiation or energy absorbed in a specific mass.
  5. 10. An electronic instrument that indicates, on a meter, the number of radiation induced pulses per minute
  6. 11. The basic unit used to describe the intensity of radioactivity in a sample of material.
  7. 13. an *blank* of an element has the same atomic number but different number of neutrons
  8. 15. a highly penetrating type of nuclear radiation
  9. 16. The removal of radioactive contaminants by cleaning and washing with chemicals
  10. 18. One of several nuclides with the same number of neutrons and protons capable of existing for a measurable time in different nuclear energy states.
  11. 19. Non-radioactive
Down
  1. 1. an electron (+ve or -ve) which has been emitted by an atomic nucleus or neutron
  2. 3. one of the subatomic particles. No electrical charge
  3. 4. The transformation of one element into another by a nuclear reaction.
  4. 6. Any material that stops ionizing radiation.
  5. 8. An atomic particle that is electrically charged, either negative or positive
  6. 12. the change of one radioactive nuclide into a different nuclei by the spontaneous emission of alpha, beta or gamma rays
  7. 14. The splitting of a heavy nucleus into two roughly equal parts
  8. 17. the core of an atom, where all of its positive charge is concentrated