sievert (Sv) /sē″vərt/ [R.M. Sievert, 20th-century Swedish physicist] , a measure of radiation dose. The sievert has the same units as the gray and is equal to the absorbed dose times the quality factor, which compares the health consequences of that type of radiation with those of x-rays. The rem bears the same relationship to the rad as the sievert does to the gray.
