The roentgen or röntgen (/ ˈrɛntɡən, - dʒən, ˈrʌnt -/; [2] symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by …

Wilhelm Conrad Röntgen (born March 27, 1845, Lennep, Prussia [now Remscheid, Germany]—died February 10, 1923, Munich, Germany) was a physicist who received the first …

Röntgen’s first work was published in 1870, dealing with the specific heats of gases, followed a few years later by a paper on the thermal conductivity of crystals.

: the international unit of measurement for X-rays and gamma rays that is based on their ability to produce charged particles in the air.

Jul 24, 2025 · The roentgen (symbol R) or röntgen (in German) is a legacy unit to measure radiation exposure. It was defined as the quantity of x-rays that produce 2.580 × 10 -4 …

Dec 10, 2025 · When Röntgen died 100 years ago in Munich on February 10, 1923, he was a world-famous man. The rays bear his name in German-speaking and Central and Eastern …

Jul 19, 2024 · Wilhelm Conrad Röntgen (1845 to 1923), a German scientist, discovered X-rays or Röntgen rays in November 1895. He was awarded the first Nobel Prize for Physics for this …