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 (Latin America) no news since of any further seasons. Mexico is also the runner-up in this season.<br> As of the sixth season, the Latin American version of The Amazing Race has visited 15 countries and has visited only the Americas (except Canada and the United States). The Amazing Race (Latin America) The Amazing Race, formerly known as The Amazing Race en Discovery Channel (), is a reality game show based on the American series of the same name, "The Amazing Race". On 15 October 2008, a Latin American version of the show was announced by Discovery Channel Latin America in association with