Decommissioning a Radioisotope Laboratory

Standard Operating Procedures:

  • A permit holder who wishes to delete a laboratory from the permit, must ensure that:
    • all signs and labels have been removed from the laboratory
    • the laboratory rules have been removed
    • all waste containers have been removed
    • all radioactive substances have been removed
    • the radiation field is measured with a survey instrument and compared to the background radiation
    • 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
    • swipe samples are taken with filter paper covering a minimum of 100 cm2 in various locations
    • swipe samples are counted by a Liquid Scintillation Counter with the energy windows wide open
    • if any samples indicate an activity greater than 0.5 Bq/cm2, the area must be decontaminated/cleaned
    • submit a written notice to the Radiation Protection Service (RPS, fax 416.971.1361, e-mail Sandu Sonoc or Hector Rocca ).
  • In the absence of the PH (retired/left the University), the Department is responsible for all of the above.
  • 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.”
  • The RPO will submit a report to the Mgr, RPS who will approve the Permit revision and/or archive the Permit.
  • The Radiation Protection Service Secretary will produce a revised permit if applicable.
  • All of the related paperwork will be filed and stored for three years by the RPS.