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This is amazing - I would have thought that any medical equipment would go through exhaustive testing and an order of magnitude more for systems involving radiation and a machine capable of lethal doses.

At my first job we even had a separate safety officer for our low powered sources used for tracing waterflow.

Part of the problem is likely that the AECL is a quasi-public entity, and governments tends not to be nearly as vigilant when regulating or policing other branches of the same government as they are when regulating a 100% privately owned company.

Yes I saw that relying of crown immunity

A lot of the regulations around safety critical software came about because of the Therac-25 accidents.

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