| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024roent•gen /ˈrɛntgən, -dʒən, ˈrʌnt-/USA pronunciation n. [countable]- Physicsa unit of radiation dosage.
Collins Concise English Dictionary © HarperCollins Publishers:: roentgen, röntgen /ˈrɒntɡən -tjən ˈrɛnt-/ n - 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
Etymology: 20th Century: named after W. K. Roentgen Roent•gen (rent′gən, -jən, runt′-; for 1 also Ger. rœnt′gən),USA pronunciation n. Wil•helm Kon•rad (wil′helm kon′rad; Ger. vil′helm kôn′rät),USA pronunciation 1845–1923, German physicist: discoverer of x-rays 1895;
Nobel prize 1901.- Physics(l.c.) a unit of exposure dose that measures x-rays or gamma rays in terms of the ions or electrons produced in dry air at 0° C and one atmosphere, equal to the amount of radiation producing one electrostatic unit of positive or negative charge per cubic centimeter of air. Abbr.: r, R
adj. - Physics(sometimes l.c.) of or pertaining to Wilhelm Roentgen, the Roentgen unit, or esp. to x-rays.
Also, Röntgen. |