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
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