Across
- 3. the 1986 accident at a nuclear plant occurred in________
- 4. this type of decay occurs when an unstable atom ejects a clump of two protons and two neutrons
- 7. this word means division
- 8. when an atomic nucleus breaks up or undergoes a change, it gives off______
- 10. in this type of decay, an excited nucleus releases energy without a change in the number of protons or neutrons
- 12. this bomb uses nuclear fusion
- 13. any substance that is unstable is________
- 14. a device that initiates an uncontrolled chain reaction
Down
- 1. the process of combining two nuclei to form a heavier nucleus and releasing energy
- 2. the process of sterilizing food by exposing them to gamma rays
- 5. a certain amount of fissionable material that is present for a chain reaction to occur
- 6. another term for domino effect
- 8. the use of radioactive substances to diagnose or treat cancer and other diseases
- 9. this occurs when an atomic nucleus breaks up or changes, emitting radiation
- 11. this type of decay occurs when a neutron in an atom’s nucleus changes into a proton, emitting an electron
- 12. the decay rate of a substance