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Across 4. uranium decays into this stable element 5. number of protons and neutrons 11. continuous action of neutrons splitting other atomic nuclei 14. wastes that emit large amounts of radiation 15. atoms of same elements with different numbers of neutrons 16. some low-level wastes are store in concrete and then disposed of here 17. where fission of u-235 occurs 20. what holds the particles of the nucleus together 23. breeder reactors can be used to make these 26. atoms that decay 27. process by which a nuclear chain reaction goes out of control` 28. material that control rods can be made of 30. name of the 2 new nuclei formed during fission 32. radon decays into this element 36. the control rods absorb these 39. first person to use the word radioactive 40. basic properties of atoms are determined by the number of these 41. changes in DNA can lead to this 43. nuclear power plants are expensive due to the required ___ measures 44. radiation can make changes in these molecules found in all our cells 45. some missing mass from a fission reaction is converted into this

Down 1. radiation is measured in these units 2. material that circulates around the fuel rods 3. number of protons in the nucleus 5. these wastes can be found in mines 6. many wastes are stored in these outside the plants 7. particles made of 2 p+ and 2 n0 8. uses U-238 to produce Pu-239 9. an element that is able to split when hit by a neutron 10. reason why breeder reactors are not used in the US 12. absorbs neutrons to slow down fission reaction 13. nucleus of a large atom is split 18. the containment building is made of this 19. function of water in the reactor 21. hospital worker are exposed to this type of wastes 22. negative subatomic particle 23. all matter is made of these 24. this natural phenomena could cause leakage of nuclear wastes 25. particle that is made of a high-speed electron, converts a n0 into a p+ 29. time it takes for 1/2 a radioactive element to decay 31. positive subatomic particle 33. neutral subatomic particle 34. most abundant nuclear fuel 35. form of electromagnetic radiation released from radioactive elements 36. cluster of p+ and n0 37. after decay, a radioactive element becomes ___ 38. the steam produced in a reactor turns these structures 42. walls of the reactor vessel are made of this