Radiation Protection Glossary

A radiation protection glossary for Radiation Protection Supervisors (RPS) and anyone interesting in radiation safety terminology. The glossary is a mixture of health physics terms, and phrases related to radiation legislation, transport, practical safety and similar.

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Sealed Source

With respect to Radiation Protection, a sealed source is a source of Ionising Radiation in the form of Radioactive material which is encapsulated. Sealed radioactive material can not escape and will not cause a Contamination hazard. Sealed sources are used in irradiators (food, products, blood), and thickness & level gauges. The activity of the sealed source can vary from a few Bq to many 10's of TBq. See Closed Source for additional definitions and Unsealed Source for the alternative type of source. Also see HASS sources.

Physics is really nothing more than a search for ultimate simplicity, but so far all we have is a kind of elegant messiness

– Bill Bryson