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University of Colorado Denver

Environmental Health and Safety, University of Colorado Denver

Radiation Safety Training

Review of Radiation

The following are guidelines and training tips regarding radiation safety. Please review each page and take the refresher quiz at the end.


Energy in the form of waves (gamma, x-ray) or particles (alpha, beta, and neutron). When the radiation interacts with matter, energy is deposited. The detection of radiation is possible due to changes that occur within the matter when radiation deposits energy. There are many beneficial uses of radiation such as diagnosis and treatment of disease.


The spontaneous emission of radiation from an unstable nucleus. A radioactive material contains nuclei that may decay by ejecting an energetic particle (radiation). Radioactivity is a property of a material. Radiation may be generated by machines such as x-ray machines or accelerators or it may be emitted by radioactive material.

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