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
The Invention of the Jewish People The Invention of the Jewish People The Invention of the Jewish People (, literally "When and How Was the Jewish People Invented?") is a study of the historiography of the Jewish people by Shlomo Sand, Professor of History at Tel Aviv University. It has generated a heated controversy. The book was in the best-seller list in Israel for nineteen weeks. An English translation of the book was published by Verso Books in October 2009. The book has also been translated into German, Italian, Spanish, Portuguese, Arabic, French and Russian, and as of late 2009 further translations were underway. "The Invention