The twin-bar pull handle with two stop buttons includes a twin-bar pull handle, two stop buttons and two brake rods. A differential amplified gain stage receives an input signal and scales the input signal to generate a scaled signal. The radiation shielding body includes a base material having radiation permeability and formed with a plurality of grooves extending in the first direction at respective positions corresponding to spaces between the detecting elements in the second direction, and a plurality of radiation shielding materials each inserted in a respective groove of the plurality of grooves.