The present invention relates to a radiological survey system utilizing an aircraft, comprising; a frame for mounting a radiation measuring instrument installed in an outside lower part of a rotary-wing aircraft (1); a mounting structure (2) for the radiation measuring instrument, secured in an upper part of the frame (7) for mounting the radiation measuring instrument; a cable (8) for transmitting and receiving data of the radiation measuring instrument connected to the mounting structure (2) for the radiation measuring instrument; an external cable line (9) for power supply connection; a survey path checking system (4) installed on a rear face of an inside driver seat of the rotary-wing aircraft(1); a portable computer (5) having a built-in data collection and analysis program (6) and installed in an upper part of the survey path checking system (4); and a position checking system (3) installed on a rear face of the portable computer (5). [Reference numerals] (4) Survey path checking system; (5,6) Display (computer) + program
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