Which organization in Canada controls the use of gamma ray devices?

The correct answer is the Canadian Nuclear Safety Commission (CNSC), which is the federal agency responsible for regulating the use of nuclear energy and materials in Canada, including gamma ray devices. The CNSC's mandate includes ensuring the safety and security of the use of nuclear substances and the protection of the health and safety of persons and the environment.

The CNSC sets stringent regulations and guidelines regarding the use, possession, and disposal of radioactive materials, which include gamma ray sources that may be used in various applications such as industrial radiography, medical diagnostics, and nuclear medicine. They ensure that all users of such devices maintain compliance with safety standards to minimize risks associated with radiation exposure.

While other organizations, like provincial regulatory bodies, may have some influence or jurisdiction over specific aspects of health and safety within their regions, the CNSC is the primary authority that oversees the safety standards and licensing agreements for radioactive devices on a national level in Canada. Health Canada focuses on public health issues, and the Canadian General Standards Board (CGSB) deals more with standardization rather than direct regulation of nuclear safety. Thus, the CNSC is the definitive regulatory body regarding the use of gamma ray devices.