%0 Journal Article %A Mary Anne Dell %T Radiation Safety Review for 511-keV Emitters in Nuclear Medicine %D 1997 %J Journal of Nuclear Medicine Technology %P 12-17 %V 25 %N 1 %X With the advent of high-energy collimators and dual-head coincidence cameras, standard nuclear medicine facilities will soon begin imaging with PET isotopes. The use of 511-keV emitters raises new radiation safety concerns for technologists traditionally limited to handling 99mTc and other low-energy isotopes. This article is a basic review of positron emitters, measurement concerns, exposure rates, shielding requirements and external radiation exposure mitigation. Newly developed PET shielding products are presented and regulatory status is discussed briefly. %U https://tech.snmjournals.org/content/jnmt/25/1/12.full.pdf