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röntgen

röntgen (symbol R) Former unit used to measure X-ray or gamma-ray radiation. One röntgen causes sufficient ionization to produce a total electric charge of 2.58 × 10−4 coulombs on all the positive (or negative) ions in one kilogram of air. The unit has been replaced by the SI unit, the gray (symbol Gy).

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"röntgen." World Encyclopedia. . Retrieved December 13, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/rontgen

Röntgen

Röntgen name of the German scientist W. C. Röntgen (1845–1923), applied to certain rays. XIX.

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"Röntgen." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 13 Dec. 2017 <http://www.encyclopedia.com>.

"Röntgen." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (December 13, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rontgen

"Röntgen." The Concise Oxford Dictionary of English Etymology. . Retrieved December 13, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rontgen