A method is disclosed to determine an inspection protocol for radioactive material in shipping containers using an inspection technique threshold characteristic. The method includes weighing a container prior to shipment and determining a relative position of the container weight to at least one of a number of predetermined inspection technique threshold lines in an inspection threshold characteristic. Each of the of the predetermined inspection technique threshold lines corresponds to at least one of a number of inspection techniques. The container is classified as either a heavy container or a light container relative to at least one of the inspection techniques according to the relative position of the container weight to at least one of the predetermined inspection technique threshold lines. An inspection protocol for radioactive material in the container is selected according to the classification of the container.