Across
- 3. Radioactive isotope affecting the thyroid with atomic number of 131
- 5. Nuclear accident site in Ukraine (1986)
- 6. Dense center of an atom containing protons and neutrons
- 10. Minimum mass needed to sustain a chain reaction
- 14. Fissile isotope commonly used in reactors with an atomic mass of 235
- 17. Positively charged particle in the nucleus
- 19. Man-made fissile isotope used in reactors/weapons
- 20. Combining of light nuclei to form a heavier nucleus
- 22. reaction – Series of self-sustaining nuclear reactions
- 24. Nuclear accident site in Japan (2011)
- 25. Severe reactor accident causing core damage
- 27. Mile Island Nuclear accident site in Pennsylvania (1979)
- 32. Neutral particle found in the nucleus
- 34. Atoms of same element with different numbers of neutrons
- 35. Half-life of 1,600 years with a atomic mass of 226
- 36. Spontaneous emission of radiation from unstable nuclei
Down
- 1. Negatively charged particle orbiting the nucleus
- 2. Materials used to absorb neutrons in a reactor
- 4. Structure designed to prevent radiation release
- 7. Half-life of 2.1 years, with an atomic mass of 134
- 8. Radioactive isotope that mimics calcium in bones, with atomic number 90
- 9. Radioactive isotope released in nuclear accidents, with atomic number of 137
- 11. Half-life of 50.5 days with a atomic mass of 89
- 12. Time required for half of a sample to decay
- 13. Radioactive isotope used in dating fossils with atomic number of 14
- 15. Splitting of a heavy nucleus into smaller nuclei
- 16. Emission of a helium nucleus from an atom
- 18. Half-life of 5.3 years, with an atomic mass of 60
- 21. – High-energy electromagnetic waves from nucleus
- 23. Smallest unit of matter that retains properties of an element
- 26. Half-life of 1.4 × 10¹⁰ years with an atomic mass 232
- 28. Device that controls nuclear reactions
- 29. decay Emission of an electron from the nucleus
- 30. Substance that slows down neutrons
- 31. Half-life of 138 days with an atomic mass 210
- 33. Half-life of 2.6 atomic with 137