Lamb, According to FormerMarine who went to the open house, the technician had a radiation badge on that he showed to those standing near by. He can clarify in a reply as long as he stays on topic, but it seems the DViS generates some low dose radiation, but since Dean is permitted to run devices that emit radiation, he is permitted to do so as long as he stays within the guidelines and spectators were not exposed to the radiation. I'm sure that all the laws were followed and Dean will not be going to jail for this.
If you didn't go, you don't know.
The checkered flag is just over the horizon.