Roentgen (unit) Roentgen (unit) The roentgen or röntgen () (symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays. It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. In 1928 it was the first international measurement quantity for ionising radiation to be defined for radiation protection, and was an easily replicated method of measuring air ionization directly by using an ion chamber. It is named after the German physicist Wilhelm Röntgen, who discovered X-rays. Although relatively easy to measure, it had
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