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 Catfish The Amazing Catfish The Amazing Catfish () is a Mexican comedy-drama film, written and directed by Claudia Sainte-Luce. The film stars Ximena Ayala as Claudia, a young woman who becomes a caretaker for Martha (Lisa Owen), an older matriarch dying of AIDS. The film premiered on August 10, 2013 at the Locarno International Film Festival, where it won two Junior Jury Awards and was a nominee for the Golden Leopard. It had its North American premiere on September 10, 2013 at the 2013 Toronto International Film Festival, and was named winner of the FIPRESCI Discovery Prize. Rotten Tomatoes gives the