Distribution of radioactive nuclides of boring core samples extracted from concrete structures of reactor buildings in the Fukushima Daiichi Nuclear Power Plant

A Bayesian Approach for Remote Depth Estimation of Buried Low-Level Radioactive Waste with a NaI(Tl) Detector

“…Traditional destructive methods, such as logging and core sampling, have been used for depth estimation; however, they are expensive and time-consuming [7,8]. Thus, various non-destructive techniques have been developed for remote-depth profiling including the relative attenuation method [9,10], principal component analysis (PCA) [11][12][13], and the approximate three-dimensional linear-attenuation method [14][15][16].…”

Development of a separation method for molybdenum from zirconium, niobium, and major elements of rubble samples

“…A detailed description of the sampling procedure is provided in Ref. [14]. Parts of the boring core samples were utilized for the Mo analysis.…”

Recent activities in the field of nuclear waste management

“…For the estimation of migration of radioactive Cs in the environment, the chemical state of fallout radioactive cesium in soils was investigated [6]. On the other hand, radioactivity of rubble, trees [7] and concrete structures [8] in the Fukushima Daiichi Nuclear Power Station were analyzed by radiochemical techniques to grasp the distribution of radioactivity on the site. Solution chemistry on strontium [9] and leaching behavior of radionuclides from UO 2 /ZrO 2 solid solutions [10] were investigated for future treatment of contaminated water and melted nuclear fuel.…”