Of various English words. Physics. In form R or r (without point). = Roentgen, n. 2.
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| 释义 | the world > matter > physics > atomic nucleus > measurement of ionizing radiation > [noun] > units of radioactivity > roentgen unit (2) R1922 Of various English words. Physics. In form R or r (without point). = Roentgen, n. 2. roentgen unit1922 Usually with lower-case initial. A unit of exposure to X or gamma radiation, now defined as equal to the quantity of radiation that gives rise to… |
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