A wash fluid containment system may include side walls that allow the systems to be easily positioned on uneven ground. For example, inband assignments such as downlink assignments andor uplink grants may be provided andor received and transmissions may be monitored andor decoded based on the inband assignment. Also, the control unit, as a second control mode, controls the size and position of the slits to rotate the examination direction, when an X-ray source is changed to a different X-ray source, such that the center of the examination regions is the same before and after the change. Further, the device comprises a heating part for heating the optical element.