Study on emission source of radioxenon detected at Takasaki station

Kijima, Yuichi ; Yamamoto, Yoichi ; Oda, Tetsuzo

It is very important to understand the behavior of background of radioxenon at the view point of monitoring of underground nuclear tests. Although all nuclear power plants (NPPs) in Japan had been shut down from 15th September 2013 to 10th August 2015, Xe-133 had been sometimes detected far beyond normal background level of the activity concentration at the CTBT Takasaki station (JPX38) during the same period. Therefore, radiopharmaceutical production facilities (RPFs) in Japan can be considered as one of the potential emission sources of Xe-133 detected at JPX38 in this period. We make a study on the possibility of RPFs as the emission source of these Xe-133 detections at JPX38 by ATM simulation.