| 21. | The TARDIS lands on a rocky planet, which has breathable air but dangerously high levels of radioactivity.
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| 22. | Alarms went off at nuclear plants signaling dangerously high levels of radioactivity, but the state kept mum.
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| 23. | As late as July 2013 slightly elevated levels of radioactivity were found in beef on sale at Tokyo markets.
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| 24. | This event had no consequence on the environment, because of the very weak level of radioactivity of the discharge,
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| 25. | A heavy metal with low levels of radioactivity, depleted uranium is used in ammunition to penetrate tanks and other armor.
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| 26. | In March 2011, following the Fukushima I nuclear accidents, levels of radioactivity in Utsunomiya were 33 times higher than normal.
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| 27. | Encased in 2 inches of lead, the six counters were showing extremely high levels of radioactivity _ three times normal.
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| 28. | In January, the plant's No . 1 reactor suffered a dramatic jump in the level of radioactivity in a turbine.
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| 29. | We did not find levels of radioactivity that could pose a direct threat to the environment or to human health.
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| 30. | Depleted uranium, a dense metal with low levels of radioactivity, is used in artillery because of its ability to penetrate armor.
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