Roentgen (unit) One roentgen deposits of absorbed dose in dry air, or in soft tissue. One roentgen of X-rays may deposit anywhere from in bone depending on the beam energy. This tissue-dependent conversion from kerma to absorbed dose is called the F-factor in radiotherapy contexts. The conversion depends on the ionizing energy of a reference medium, which is ambiguous in the latest NIST definition. The roentgen has its roots in the Villard unit defined in 1908 by the American Roentgen Ray Society as "the quantity of radiation which liberates by ionisation one esu of electricity per cm of air under normal conditions
Kaiser Wilhelm II Land 370 metre high extinct volcano which was named after the mathematician and physicist Carl Friedrich Gauss. Kaiser Wilhelm II Land Kaiser Wilhelm II Land (also Wilhelm II Coast) is the part of Antarctica lying between Cape Penck, at 87°43'E, and Cape Filchner, at 91°54'E and is claimed as part of the Australian Antarctic Territory, although this claim is not universally recognized. The area was discovered on February 22, 1902 during the Gauss expedition (1901-1903), led by Arctic veteran and geology professor Erich von Drygalski. Drygalski named it after Kaiser Wilhelm II who had funded the expedition with 1.2 million Goldmarks.