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Across 1. None of these with Nuclear power 8. Use radioactivity to find out how long he's been dead 9. Nuclear power stations produce lots of ..... 11. Harmful sustance produced in nuclear reactors 13. A sub atomic particle used in fission reactions 14. Two protons and two neutrons 17. Break up Uranium with a neutron 18. The nucleus of heavy elements become .............. 19. Type of reaction which occurs in nuclear reactors 20. Positive sub atomic particle

Down 1. High frequency electomagnetic radiation 2. Keeping our homes safe - but has a radioactive source! 3. Killing cancer cells with radiation 4. Radioactive chemical used to investigate the movement of chemicals in the body 5. Put surgical instruments in a nuclear reactor to 6. Another name for nuclear disintigration 7. Nuclear fuel 8. Nuclear radiation from space 10. Where beta particles come from 11. The charge on a beta particle 12. Small particle which orbits the nucleus 15. Food with higher nuclear count rate 16. Humans can develop this if exposed to high levels of radiation