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roentgen

noun
/ˈrɒntɡən/
/ˈrentɡən/
(physics物理)
(abbreviation R)
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  1. a unit of radiation, used to measure the quantity of X-rays or gamma radiation that have reached somebody/something伦琴(辐射单位)
    Word Origin1920s: named after Wilhelm Conrad Röntgen (1845–1923), German physicist, discoverer of X-rays.

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