Radioactive Pollution

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Across
  1. 5. Series of radioactive decays from a single isotope
  2. 8. Device measuring exposure to radiation
  3. 10. Type of radiation with low penetration power
  4. 12. Radioactive isotope from nuclear fission
  5. 16. Barrier protecting against radiation
  6. 17. High-energy, high-speed electron or positron
  7. 18. Splitting of atomic nuclei releasing energy
Down
  1. 1. Radioactive gas from natural sources
  2. 2. Heavy metal used in nuclear reactors
  3. 3. Site of a major nuclear disaster in 1986
  4. 4. Process of safely closing a nuclear plant
  5. 6. Unwanted presence of radioactive substances
  6. 7. Variant of an element with different neutron count
  7. 9. Radioactive isotope used in medicine and industry
  8. 11. High-energy electromagnetic radiation
  9. 13. Time for half a radioactive substance to decay
  10. 14. Dangerous isotope from nuclear fallout
  11. 15. Radioactive element used in nuclear weapons