Order issued to Best Theratronics Ltd.
November 6, 2024
The Canadian Nuclear Safety Commission (CNSC) issued an order on November 6, 2024, to Best Theratronics Ltd. Best Theratronics is located in Ottawa, Ontario, and holds a Class IB nuclear substance processing facility operating licence.
The order was issued when it was found that Best Theratronics was no longer in compliance with its licence condition regarding a financial guarantee for decommissioning. The order requires the licensee not to operate under its Class IB licence until a financial guarantee acceptable to the Commission is established and an acceptable plan to restart operations is provided.
Order amended by the Commission
February 14, 2025
The Commission has reviewed the order issued to Best Theratronics Ltd., as required under the Nuclear Safety and Control Act (NSCA). The Commission considered the information in the order, as well as submissions by the designated officer and the licensee.
Pursuant to subsection 37(6) of the NSCA, the Commission has amended the order to clarify the requirements for the financial guarantee. The amended order will be in place until the licensee complies with the actions in the amended order.
Read the Record of Decision (PDF)
Order amended by the Commission
October 22, 2025
The Commission has redetermined its amendment of the order issued to Best Theratronics Ltd. Best Theratronics must reduce its onsite inventory of CNSC-regulated material in accordance with CNSC regulatory requirements. This inventory reduction is subject to specific timelines.
Additionally, Best Theratronics is required to submit a preliminary decommissioning plan that accounts for the reduction of sources in inventory and must establish a financial guarantee acceptable to the Commission, in accordance with the timelines specified in the amended Designated Order.
Order amended by the Commission
February 23, 2026
The Commission has redetermined its amendment of the order issued to Best Theratronics Ltd. and has extended the deadline for compliance with the following actions in the order:
- Remove all Category 1 and Category 2 sources by May 31, 2026
- Provide CNSC staff with a revised preliminary decommissioning plan by March 31, 2026
- Provide a financial guarantee for the Commission’s consideration and acceptance by June 15, 2026
Read the record of decision (PDF)
Order ceases to have effect after Commission revokes Class IB licence held by Best Theratronics Ltd.
July 31, 2026
The Commission determined that Best Theratronics Ltd. no longer qualifies for a Class IB licence after significantly reducing its inventory of Category 1 and Category 2 sealed sources and obtaining a nuclear substances and radiation devices (NSRD) storage licence. As a result, the Commission revoked the Class IB licence held by Best Theratronics Ltd. and the order ceases to have effect.
The licensee remains under CNSC regulatory oversight through its NSRD licence and Class II nuclear facilities and prescribed equipment licence. The licensee is also required to maintain its letter of credit in addition to the standard financial guarantee requirements for NSRD licensees.
The revocation of the Class IB licence means that Best Theratronics Ltd. is restricted to activities authorized by its valid licences and cannot undertake activities authorized by a Class IB licence.
Read the record of decision (PDF)Page details
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