Radiation Safety Manual Glossary - (L)

Labeled Compound

a compound consisting, in part, of labeled molecules. By observations of radioactivity or isotopic composition this compound or its fragments may be followed through physical, chemical or biological processes.

LD_50/60

the dose of radiation expected to cause death within 60 days to 50 percent of those exposed.

Licensed Material

source material, special nuclear material, or byproduct material received, possessed, used, transferred or disposed of under a general or specific license issued by the Nuclear Regulatory Commission.

Licensee

the holder of the license.

Limits

the permissible upper bounds of radiation exposures, contamination or releases.