Original sentence: It is superseded in the SI by the gray; the United States is the only country to still use the rad.The rad is an unit of radiation dose, with symbol rad
Edited sentence: A rad is a old outdated unit of radiation dose, and the symbol for this unit.For other usages of the term, see Rad.The USA is the last jurisdiction in the world to still cling to this old unit.This article is about the unit of radiation dose