Abstract: A STUDY OF LARGE CONTAINER RADIATION INSPECTING SYSTEMSAn Jigang（Institute of Nuclear Energy Technology，University Beijing 102201）AESTRACT The principle of large container radiation inspoting systems are illustrated．The techiucal featuresof foreign container inspecting systems are reviewed briefly．The project and main characteristics of Tsinghua－Scan system are also interpreted．The radiography of a motorcycle，a rifle and a pistol gotfrom the intermediate size Tsinhua－Scan system is presented．Key words container X－ray gamma rays array ionization chamber radiography