Controlling nuclear reactions crossword

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Across
  1. 1. Time for half of a radioactive sample to decay
  2. 5. Two atoms with the same number of protons but different number of neutrons
  3. 8. When atom splits it is called nuclear __________
  4. 9. Stops all radiation
  5. 12. Stopped by paper
  6. 13. Radioactive atom used in a nuclear reactor
  7. 14. Shield surrounding the nuclear reactor
Down
  1. 2. Used to stop Beta
  2. 3. Slows down neutrons so they can be absorbed
  3. 4. Released when an atom splits
  4. 6. Absorb neutrons to slow down reaction
  5. 7. The ________ number shows the number of protons in an atom
  6. 10. Uncontrolled nuclear reactor
  7. 11. Most penetrating form of radiation