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OTTAWA — Two truckers were exposed to excessive doses of radiation last year while hauling a radioactive device across the country, newly released documents show. A preliminary investigation by Canada’s nuclear-safety watchdog found the drivers got more than their yearly limit of radiation on a six-day trip last December. The Canadian Nuclear Safety Commission learned of the problem when the shipment triggered a radiation alarm on arrival at an MDS Nordion office in Ottawa. The commission traced the problem to a technician with Nomad Inspection Services of Olds, Alta., who didn’t fasten a safety lock to a radioactive device before it was packaged and shipped. The company didn’t tell anyone that the safety lock wasn’t in place, says a February report into the incident. The device’s radioactive source shifted from its shielded to unshielded position somewhere between Edmonton and Ottawa, exposing the drivers to high doses of radiation. “Since it cannot be determined as to when the source moved from its shielded to unshielded position, the assumption is that the source became exposed in Edmonton,” the report says. “Using this assumption and dose-rate measurements taken from the package following receipt at their facility, MDS Nordion concluded that only the two drivers . . . would have been exposed to a dose . . . which is above the limit for members of the public.”