IG Physics - Radioactivity

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Across
  1. 3. The number of protons in the nucleus of an atom.
  2. 6. Radiation consisting of fast-moving electrons.
  3. 10. Radiation that can remove electrons from atoms.
  4. 11. Unit used to measure the activity of a radioactive source.
  5. 13. A detector used to measure ionising radiation.
  6. 15. When radioactive material gets inside or onto an object or person.
  7. 16. Exposure to radiation without radioactive material being transferred.
  8. 18. A neutral particle found in the nucleus of an atom.
Down
  1. 1. The time taken for the activity of a radioactive source to halve.
  2. 2. Highly penetrating electromagnetic radiation.
  3. 4. The total number of protons and neutrons in a nucleus.
  4. 5. Radiation that is always present from Earth and space.
  5. 7. The rate at which a radioactive source decays.
  6. 8. Strongly ionising radiation with low penetrating power.
  7. 9. How easily radiation passes through materials.
  8. 10. Atoms of the same element with different numbers of neutrons.
  9. 12. A negatively charged particle that moves around the nucleus.
  10. 14. A positively charged particle found in the nucleus.
  11. 17. The smallest unit of an element, made of protons, neutrons and electrons.