For example: if they know there is a radioactive source on board the vehicle they should check for its presence and integrity as soon as it arrives at its desti

For example: if they know there is a radioactive source on board the vehicle they should check for its presence and integrity as soon as it arrives at its destination. Ideally they should check for its presence on board at the end of each transport day, perhaps by measuring the level of radiation near the box which contains the item.