15.0 Source Storage Procedures

All radiation sources must be stored in a secured location (restricted access, minimum fire hazard, approved ventilation, sufficient shielding), labeled, and the location posted with a "Caution Radioactive Material" sign. The EH&S Department will provide the proper signs and surveys to ensure compliance with the posting requirements of NAC 459.355-3575.

  1. Sources which could release airborne radioactive material must be stored in an approved fume hood or glove box.
  2. Storage procedures for radioactive materials shall be provided by the user and approved by EH&S.
  3. Radiation sources must be stored in a secured area with access controlled by the user. Radiation levels in any "Uncontrolled" area must be less than 2 mrem/hr and 50 mrem/yr. The User is responsible for obtaining any shielding needed to satisfy these requirements.
  4. Radiation source storage areas and containers shall be marked with signs and labels in accordance with NAC 459.3555-3575.
  5. Biannual radiation surveys of the storage area shall be made by the Radiation Safety Office. A record of these surveys will be provided to the appropriate Authorized User and kept on file in the Radiation Safety Office.
  6. Changing storage areas must be approved in advance by the RSO. Temporary storage at another University site for up to 24 hours is allowed if approved in advance by the RSO and the source is secured against unauthorized removal, and radiation levels in uncontrolled areas are below 2 mrem/hr.
  7. Use adequate shielding. Exposure rate must not exceed 2 mrem/hr and 50 mrem/yr at 30 cm (1 foot) from the shield including the areas behind, above or below the shield. Make sure the bench top (if used) will support the weight of a shield and that shielding materials are secured so they will not topple or fall.
  8. Provide a pan and absorbent pad to catch spillage.
  9. Clearly identify each item in storage, use a mirror or transparent portion of shield to allow for visual inspection without exposure, if applicable. Provide a sketch of the storage layout showing where items are stored, or a written description of the item and its location.
  10. A compartmentalized shield (use partitions or smaller shipping shields) will reduce exposure to the aggregate of the sources.
  11. Use a plastic box or another secondary container for items in storage in refrigerators and freezers.
  12. Do not store food or beverages in areas (including refrigerator) where radioactive materials are stored.
  13. Locate appropriate handling tools and supplies (automatic pipet, tongs, gloves, etc.) conveniently.
  14. Store radioactive liquids in unbreakable containers or in secondary containers to prevent spillage.
  15. Shield radioactive wastes in storage that are awaiting pickup so that radiation levels at 30 cm from the surface do not exceed 2 mR/hr.