A seat weighing device wherein a load transmitting member for transmitting the seat load to a load sensor is formed without extremely high precision required, thereby enabling simple manufacturing of the load transmitting member. The first signal component is intended for the first wireless receiver and the second signal component is related to at least one of a sending signal ) generated by a transmitter or to a second signal ) intended for a second wireless receiver. Muon coordinate and incidence angle measured above and below the interrogated volume can be used for the decision making on the presence of nuclear substance inside the volume. In addition, the physical density of the cathode is also increased. A scoring matrix denotes ranges of values of the Trustworthy Factor into a Level of Trust Zone.