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
Roentgen Stories Roentgen Stories Roentgen Stories is a DVD collective of four promotional videos (PVs) by popular Japanese rock vocalist Hyde. Released November 3, 2004 by Ki/oon Records and Haunted Records. It features the PVs of the three singles and additional bonus music video. All songs are from his first solo album, Roentgen. The order the videos are arranged on the DVD are coincidentally the order in which they were released. The videos are meant to be watched in a series, so that the four together tell a story, with prevailing themes of life and death and the mingling of the two.