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This module will focus primarily on issues surrounding relatively small sources of high energy radiation, which are used in censor applications in industrial settings. If radiation is not properly controlled, it can be hazardous to the health of workers. Radiation may be defined as energy traveling through space and can be classified into two broad categories, ionizing and non-ionizing. Ionization is the process in which a charged portion of a molecule, usually an electron, is given enough energy to break away from the atom. This process changed the atomic structure of the molecule and results in the formation of two charged particles called ions. The term radiation is commonly associated with radioactivity which refers to a substance which gives off ionizing radiation.