| 11. | RADIOACTIVITY : More than 5 million people exposed to radioactive fallout.
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| 12. | He said levels of the radioactivity were no higher than usual.
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| 13. | Still, they insisted the radioactivity poses no real health danger.
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| 14. | The radioactivity case, we are in the middle of investigating,
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| 15. | Some of polonium's applications are due to its radioactivity.
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| 16. | Henri Becquerel discovered radioactivity in 1896 while working with phosphorescent materials.
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| 17. | These levels of radioactivity pose little danger but can confuse measurement.
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| 18. | Emission of radioactivity from a nuclear plant is controlled by regulations.
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| 19. | It also lowered boats to test radioactivity levels in the lagoon.
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| 20. | Recordings from devices measuring radioactivity were immediately put under military secrecy.
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