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 The sweeping ballads of Roentgen mask a much more solemn message. An interesting note is that the cover of the Evergreen single features one rose. Angel's Tale features two tulips. Continuing in this pattern, Shallow Sleep, the third single released should have three lilies but instead, the single's cover clearly depicts four lilies. Two theories are possible: The first theory is more likely, though, due to the arrangement of the videos on the DVD and the progression of the story told through them. Roentgen Stories Roentgen Stories is a DVD collective of four promotional videos (PVs) by popular Japanese rock