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
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