Decommissioning a Radioisotope Laboratory

Reviewed: March 2020

Standard Operating Procedures:

  1. A permit holder who wishes to delete a laboratory from the permit, must ensure that:
    1. all signs and labels have been removed from the laboratory
    2. the laboratory rules have been removed
    3. all waste containers have been removed
    4. all radioactive substances have been removed
    5. the radiation field is measured with a survey instrument and compared to the background radiation
    6. if the radiation field is above background, the source of the radiation must be determined and removed or cleaned until the radiation field is equal to the background radiation level
    7. swipe samples are taken with filter paper covering a minimum of 100 cm2 in various locations
    8. swipe samples are counted by a Liquid Scintillation Counter with the energy windows wide open
    9. if any samples indicate an activity greater than 0.5 Bq/cm2, the area must be decontaminated/cleaned
    10. submit a written notice to the Radiation Protection Service (RPS, fax 416.971.1361, e-mail Sandu Sonoc or Vanieshree Ranganathan).
  2. In the absence of the PH (retired/left the University), the Department is responsible for all of the above.
  3. After receiving notice from the Permit Holder/Department a Radiation Protection Officer (RPO) will visit the laboratory. The RPO will audit all of the above and complete the “Laboratory Decommissioning Report.”
  4. The RPO will submit a report to the Mgr, RPS who will approve the Permit revision and/or archive the Permit.
  5. The Radiation Protection Service Secretary will produce a revised permit if applicable.
  6. All of the related paperwork will be filed and stored for three years by the RPS.