Examlex
The Border slave states that remained loyal to the Union included
Radioactive Materials
Substances that emit radiation as a result of nuclear decay, used in a variety of applications but also associated with health risks.
Radioactivity
The process by which atoms emit energy in the form of particles or electromagnetic waves due to the decay of their unstable nuclei.
Phosphorescence
A type of photoluminescence related to fluorescence, but in which a material emits light for a longer period after the initial excitation energy is supplied.
Chemiluminescence
The emission of light (luminescence) as a result of a chemical reaction without the need for external light sources.
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