In a solid-state image-sensing device, when image sensing is performed, in each pixel, MOS transistors T1 and T5 are turned on and a MOS transistor T6 is turned off so that a MOS transistor T2 operates in a subthreshold region. In addition, a radio wave environment is measured. A tubing spool connects to the upper end of the wellhead housing. A first scaled distribution is computed from the first distribution and a second scaled distribution is computed from the second distribution based on the respective acceleration factors.