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
Albany Medical College co-founder of the American Medical Association. AMC is attributed as the site where David S. Sheridan perfected the modern-day disposable catheter, among other major discoveries and innovations. Among AMC alumni accomplishments include the discovery of the hormone leptin, the invention of computed tomography, and the discovery of oral rehydration therapy. There are multiple courses of study at the College, with tracks that end in an MD degree, as well as a Graduate Studies program with the following departments: AMC sponsors medical residency programs in anesthesiology; emergency medicine; family medicine; internal medicine; medicine/pediatrics; neurology; obstetrics, gynecology, and reproductive sciences; ophthalmology; pathology;