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Roentgen

The röntgen (symbol R) is a unit of dosage of X-rays or gamma radiation, being the dose that liberates positive and negative charges of 2.58×10-4 coulombs per kilogram of air. It is named after the physicist Wilhelm Röntgen.



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Thomas a Kempis

... miles northwest of Cologne) in 1380 and died near Zwolle (52 miles east-north-east of Amsterdam) in 1471. His paternal name was Hemerken or Hammerlein, "little hammer." ...

 
 
 
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