Published: Oct 12, 2018
The rem is the old unit of Equivalent Dose (or more accurately Dose Equivalent) and is derived by multiplying Absorbed Dose (in Rads) by a Quality Factor. The modern SI unit is the Gray (Gy). 1 Gy = 100rem. See equivalent dose for a explanation of why the absorbed dose is modified to reflect the relative effectiveness of Ionising Radiations in causing biological damage.