| 词汇 | roentgen |
| 词根词缀 | 词源： 1896, in Roentgen rays "X-rays," in allusion to Ger. physicist Wilhem Conrad Röntgen (1845-1923), who discovered X-rays in 1895. As a unit of exposure to radiation, it is attested from 1922, proposed in Fr. in 1921. |
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