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A particle accelerator is a piece of equipment that increases the speed of subatomic particles and emits them in a focused beam. Linacs, electron beam welders, and x-ray tubes are examples of particle accelerators. The Canadian Nuclear Safety Commission (CNSC) has begun to exercise regulatory authority over particle accelerators operating at a beam energy of 1 MeV or higher. If you operate an accelerator in this energy range, as of December 31, 2012 it is required to be certified. By December 2013, such accelerators must operate under the appropriate CNSC Class I or Class II license. For more information regarding this change, see the CNSC information page and FAQs.