The Authorized User is required to maintain up-to-date records of the use, decay, and disposal of the radioactive materials assigned to their laboratory. The Authorized User must implement a viable radionuclide inventory and record keeping method. The user and lab personnel must know where the inventory records are located and how they are used. Authorized Users will:

1. Maintain a log of receipt, use, and disposal of radioactive materials as it occurs. An inventory record sheet (Appendix H) is supplied with each radionuclide delivered which can be used for record keeping purposes. Alternate methods that provide the required information may also be used.
2. Be able to ascertain total activity for each assigned radionuclide at any time. If short-lived nuclides are used, decay must be considered.
3. Keep copies of all supply, disposal, and transfer documentation, and maintain those records for review by regulatory officials for a minimum of three years.

The Radiation Safety Program is responsible for maintaining the University’s inventory of radioactive materials, including materials held by each Authorized User and those materials held as waste. Radiation Safety will:

1. Maintain a running inventory for each radionuclide an Authorized User possesses based on receipt and disposal forms provided by the lab and prevent users from exceeding the order and/or possession limits specified within their radionuclide use authorization.
2. Assure that the NRC license limits are not exceeded and that all associated license conditions are met.
3. Check user inventory records during routine lab audits to ensure accuracy. This may involve a physical inventory.