The use or threatened use of force or violence against persons or property in violation of criminal laws for purposes of intimidation, coercion, or ransom, in support of political or social objectives
Radioactive tracers in biochemistry. : Radioactive and stable isotope tracers in biomedicine : principles and practice of kinetic analysis / Robert R. Wolfe
Radioactive Waste -- classification : Risk-based classification of radioactive and hazardous chemical wastes : recommendations of the National Council on Radiation Protection and Measurements