For those of you who don't visit the Itchmo forum here is a link to a thread that has been posted on there by someone who has done some digging
In the public interest - Orijen irradiation
The OP, "Public Informer" has invited cross-posting so here it is.
Documents released under the Australian Freedom of Information act that indicate that Champion not only knew about the irradiation they denied knowing about prior to their food going on sale here, they were actually contacted by their importer to discuss whether to go ahead with the irradiation. According to the importer they agreed to the irradiation and to the costs involved.
No surprises there really. Just makes me even more determined to see justice done one way or another.