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 1 In the leg's second Detour was "Mariachis" or "" . In "Mariachis", teams had to find an image of Santa Muerte under a hat worn by one of the mariachis playing. In "Trajineras", teams had to find a "trajinera" (typical boats of Xochimilco) called "Zita" and find the clue inside the boat. 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