Roentgen (unit) this derivative quantity the roentgen equivalent physical (rep) to distinguish it from the ICR roentgen. The introduction of the roentgen measurement unit, which relied upon measuring the ionisation of air, replaced earlier less accurate practices that relied on timed exposure, film exposure, or fluorescence. This led the way to setting exposure limits,and the National Council on Radiation Protection and Measurements of the United States established the first formal dose limit in 1931 as 0.1 roentgen per day. The International X-ray and Radium Protection Committee, now known as the International Commission on Radiological Protection (ICRP) soon followed with a limit of
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.