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Across
  1. 3. Unwanted presence of radioactive material
  2. 4. High-energy photon radiation
  3. 6. Material protecting from radiation
  4. 7. Time for half radioactive substance to decay
  5. 9. Radioactive isotope used in research or medicine
  6. 11. Substance slowing down neutrons
  7. 16. Fluid removing heat from reactor core
  8. 17. Substance changing color at endpoint
  9. 19. Removal of radioactive substances
  10. 20. Device measuring exposure to radiation
  11. 22. Neutral particle in nucleus
Down
  1. 1. Radioactive element used in nuclear reactors
  2. 2. Release of electron or positron
  3. 5. Release of helium nucleus
  4. 8. Regulates rate of nuclear fission
  5. 10. Technique determining concentration of solution
  6. 12. Isotope used for dating fossils
  7. 13. Device controlling nuclear reactions
  8. 14. Positively charged particle in nucleus
  9. 15. Energy emitted as waves or particles
  10. 18. Point where reaction is complete in titration
  11. 21. Element used as nuclear fuel