| 21. | A : Only an extremely small amount of plutonium occurs naturally.
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| 22. | Plutonium bombs, in contrast, require more sophisticated detonation systems.
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| 23. | Russia's preference is to use the plutonium in reactors.
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| 24. | These rods contain plutonium that can be used in nuclear weapons.
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| 25. | American technicians trained Indian scientists to reprocess spent fuel for plutonium.
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| 26. | Schwoegler acknowledged that safety violations had occurred in the plutonium building.
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| 27. | They also agreed to begin disposing of bomb-grade plutonium.
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| 28. | Krasnoyarsk's plutonium industry did not stay secret for long.
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| 29. | The emphasis on plutonium makes the nuclear power program virtually unique.
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| 30. | Russia is the world's most inviting source of plutonium.
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