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 en Discovery Channel 2 If they found the book, they can exchange the book to receive the final clue. The Amazing Race en Discovery Channel 2 The Amazing Race en Discovery Channel is a Latin American version of the American reality television show "The Amazing Race". The second season featured eleven teams of two, with a pre-existing relationship, in a race across Latin America to win US$250,000. The second season premiered on Sunday 26 September 2010 at 11.00 p.m (). This was the final season to be aired in Discovery Channel Latin America. Mexican brothers Mauricio and Carlos Coarasa are the winners of the