- roentgen
[roentgen 词源字典]
- 1896, in Roentgen rays "X-rays," in recognition of German 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 French in 1921.[roentgen etymology, roentgen origin, 英语词源]