| 单词 | roentgen |
| 释义 | Roentgen in British English or Röntgen (ˈrɒntɡən, -tjən, ˈrɛnt-; German ˈrœntɡən) noun Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845–1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901 roentgen in British English or röntgen (ˈrɒntɡən, -tjən, ˈrɛnt-) noun a unit of dose of electromagnetic radiation equal to the dose that will produce in air a charge of 0.258 × 10–3 coulomb on all ions of one sign, when all the electrons of both signs liberated in a volume of air of mass one kilogram are stopped completely Symbol: R, r Word origin C20: named after W. K. RoentgenRoentgen in American English (ˈrɛntgən; German ˈʀœntgən) Wilˌhelmˈ Konˌrad (ˈvɪlˌhɛlmˈkɔnˌʀɑt) 1845-1923; Ger. physicist: discoverer of X-rays roentgen in American English (ˈrɛntgən; ˈrɛntʃən) noun a basic unit of exposure to X-rays, gamma rays, or other ionizing radiation, equal to the amount of radiation that will produce an electric charge of 0.000258 coulomb per kilogram of dry air abbrev. R Word origin after Roentgen |
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