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 Loewenthal Moisés Ville, the first colony of the JCA. It has been proven by banking records that Lowenthal died in Berlin two years later, after leaving Brussels. In the colony, Lowenthal's name graces the principal thoroughfare. Wilhelm Loewenthal Wolff Wilhelm Lowenthal ( – ) was a Polish-born, naturalized French Doctor of Medicine. Born in Rybnik, Poland, after graduating from the University of Berlin, Lowenthal (or Löwenthal, with the umlaut), went to the Caucasus to continue his medical research. At the same time, he was Professor at the University of Geneva, in its branch at the Lausanne, Switzerland. He corresponded regularly with