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Radiation Protection Glossary

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Rem
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.