I would be happy to try and answer any questions you may have.
As far as an operating procedure, for that I may need some clarification.
Typically systems are set to successfully inspect the product through either manual or automatic set up procedures. Verification of proper set up and operation is conducted prior to production run and re verified at predetermined frequencies throughout the production run and again at the conclusion of the run. This activity should include verification of detection , rejection and any other activity involved in the safety plan. (i.e. segregating the product, disposal, rework. etc..)
Regarding the Radiation Protection Plan for a Food Processing, typically when systems are installed, moved or modified in any way a radiation survey is conducted to ensure the emissions are within the specified guidelines. These specified guidelines could be Federal, State or Country specifications. It is always best to check with local enforcement to be sure the system is in compliance.