2013 年 48 巻 4 号 p. 193-199
Since the reprocessing contracts with electric power companies were completed in March 2006, the horizontal distribution of 129I in soil within 10 km radius from Tokai Reprocessing Plant (TRP) as well as the vertical distribution at 2 km southwest from TRP were measured using the Accelerator Mass Spectrometry (AMS) method. As a result, the small amounts of 129I were observed due to the atmospheric discharge from TRP. Moreover, it was good agreement with the predicted concentrations in safety assessment. The validity of the diffusion calculation was confirmed in the 10 km radius. Furthermore, it was suggested that 129I adsorbing by soil was difficult to move down for several decades from the vertical profile of 129I concentration.
