Roentgen (unit) Roentgen (unit) The roentgen or röntgen () (symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays. It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. In 1928 it was the first international measurement quantity for ionising radiation to be defined for radiation protection, and was an easily replicated method of measuring air ionization directly by using an ion chamber. It is named after the German physicist Wilhelm Röntgen, who discovered X-rays. Although relatively easy to measure, it had
The Amazing Race en Discovery Channel 1 The Amazing Race en Discovery Channel 1 The Amazing Race en Discovery Channel (; ) is a Latin American reality television game show based on the American series, "The Amazing Race". The first season of the show featured eleven teams of two with a pre-existing relationship, in a race across Latin America to win US$250,000. The race was produced by RGB Entertainment. The host of the show is Harris Whitbeck. The Amazing Race en Discovery Channel premiered on Sunday 20 September 2009 at 10:00 p.m.(UTC-5). The season finale was aired on 13 December 2009 at 10:00 p.m. (UTC-5). Argentine married