All radioactive stock materials and sealed sources must be stored in a secured container or secured storage area when not in use. Any room in which an unattended sealed source is being used must be secured. Exceptions must be approved in writing by the Office of Environmental Health and Safety (EHS). A stock material is defined to be radioactive material as provided by the vendor and does not include material withdrawn from the original stock material by a researcher for experimental use. This policy applies to materials for which EHS approval and authorization is required and does not apply to generally-licensed devices, such as smoke detectors, static eliminators, electron capture detectors, exit signs, etc.
Established December 1996 by the Radiation Safety Committee.