Roentgen (unit) absorbed dose in a wide range of matter. When measuring absorbed dose in a human due to external exposure, the SI unit the gray, or the related non-SI rad are used. From these can be developed the dose equivalents to consider biological effects from differing radiation types and target materials. These are equivalent dose, and effective dose for which the SI unit sievert or the non-SI rem are used. The following table shows radiation quantities in SI and non-SI units: Roentgen (unit) The roentgen or röntgen () (symbol R) is a legacy unit of measurement for the exposure of X-rays
Wilhelm Dürr the Younger assistant professor at the Munich Academy of Fine Arts and, in 1892, professor. There he taught mainly life classes. At the end of his life, he was seriously ill and only painted a few pictures. In Dachau, Wilhelm-Dürr-Straße is named in honour of the painter. Wilhelm Dürr the Younger Wilhelm Dürr the Younger (24 August 1857, Freiburg im Breisgau, Baden – 23 February 1900, Munich) was a German painter and draughtsman, as well as a professor at the Academy of Fine Arts in Munich. Dürr was the son of the painter Wilhelm Dürr the Elder (1815–1890) and his wife Berta