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
David Roentgen flat-pack home assembly without an allen key. According to his biography in the Encyclopædia Britannica Eleventh Edition of 1911, Roentgen was not a great cabinetmaker: "His forms were often clumsy, ungraceful, and commonplace; his furniture lacked the artistry of the French and the English cabinetmakers of the great period which came to an end about 1790. His bronzes were poor in design and coarse in execution; his work, in short, is tainted by commercialism. As an inlayer, however, he holds a position of high distinction. His marquetry is bolder and more vigorous than that of Riesener, who in other respects