röntgen

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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 The unit has been replaced by the SI unit, the gray (symbol Gy).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

views updated Jun 27 2018

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

The Concise Oxford Dictionary of English Etymology T. F. HOAD

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