Roentgen (unit) One roentgen deposits of absorbed dose in dry air, or in soft tissue. One roentgen of X-rays may deposit anywhere from in bone depending on the beam energy. This tissue-dependent conversion from kerma to absorbed dose is called the F-factor in radiotherapy contexts. The conversion depends on the ionizing energy of a reference medium, which is ambiguous in the latest NIST definition. The roentgen has its roots in the Villard unit defined in 1908 by the American Roentgen Ray Society as "the quantity of radiation which liberates by ionisation one esu of electricity per cm of air under normal conditions
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