| 11. | Annual exposure to five roentgens of radiation is considered safe.
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| 12. | Roentgen was first and foremost an astute man of business.
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| 13. | These clocks were housed in obelisk cases made by the Roentgen workshops.
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| 14. | His son, David Roentgen, was born on 11 August 1743.
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| 15. | The roentgen is commonly used internationally in the nuclear industry.
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| 16. | There are approximately 3876 roentgens in one coulomb per kilogram.
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| 17. | In disbelief and growing excitement, Roentgen repeated the experiment over and over.
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| 18. | The quiet of Roentgen's world was shattered.
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| 19. | The container found last month was emitting radiation at two roentgens per hour.
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| 20. | 1895-Wilhelm Conrad Roentgen, German physicist, discovers X-rays.
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