It is a type of luminiscence in which eradiated food stuff can be preserved with the help of radiation for long duration.
Chemiluminescence deals with the creation of light through the use of artificial chemical reagents while bio-luminescence deals with chemicals made by an organism for the purpose of giving off light. Imagine a glow-stick: This is an example of chemiluminescence. Compare that to a lightning bug (also known as a firefly) or a cuttlefish.