Dose Rate Effectiveness Factor (DREF) : The ratio between the risk per unit effective dose for high dose rates and that for low dose rates. Superseded by dose and dose rate effectiveness factor DDREF
International Atomic Energy Agency IAEA, Department of Nuclear Safety and Security, IAEA Safety Glossary (Terminology Used In Nuclear Safety and Radiation Protection), IAEA, Vienna. Austria 2007. ISBN 92-0-100707-8, http://www-pub.iaea.org/MTCD/publications/PDF/Pub1 290_web.pdf, (Nucl Sfty and Rad Prot - Brit) {459}