Artificial radionuclides in the western Northwest Pacific (II):137Cs and239,240Pu inventories in water and sediment columns observed from 1980 to 1986

137Cs and 239+240Pu levels in the Asia-Pacific regional seas

“…6). Nagaya and Nakamura (1987a) observed uniform concentrations of 137 Cs in the near-surface layer of the column followed by a decreasing trend with depth in Northwest Pacific Ocean. It is well established that 137 Cs appears to be preferentially bound to clay and organic particles and is strongly adsorbed on cation-exchange sites.…”

Spatial distribution of 3H, 90Sr, 137Cs and 239,240Pu in surface waters of the Pacific and Indian Oceans—GLOMARD database

“…Traditionally, several Japanese institutes have been active in investigating these radionuclides, especially in NW Pacific waters, e.g. Nagaya and Nakamura (1970, 1976, 1984, 1987, 1993, Aoyama and Hirose (1995), Miyake et al (1988), Nakanishi et al (1990), Hirose et al (1992), Hirose (1997), Hirose et al (1999), Ikeuchi et al (1999), Aoyama et al (2001a,b) and many other research groups. The third group of investigations was connected to nuclear weapons testing sites in the Marshall Islands, e.g.…”

“…Data from the joint Japanese-KoreanRussian expeditions in 1994 (STA, 1995(STA, 1997 were used in the evaluations, as well as data produced by IAEA-MEL (Pettersson et al, 1995(Pettersson et al, , 1996. Further data were obtained from a literature survey covering the western and central N Pacific (Nagaya and Nakamura, 1984, 1987, 1993Aoyama and Hirose, 1995;Miyake et al, 1955;Nakanishi et al, 1990;Hirose et al, 1992;Yang et al, 1986;Livingston, 1986;Nakanishi et al, 1995;Livingston and Noshkin, private information) as well as the eastern Equatorial Pacific (Cochran, 1985).…”

Anthropogenic radionuclides in sediment in the Japan Sea: distribution and transport processes of particulate radionuclides

“…In Fig. 3b, results of previous studies (Nagaya and Nakamura, 1987;Lee et al, 1998;Hong et al, 1999;Pettersson et al, 1999;Lee, S.-H. et al, 2003;Zheng and Yamada, 2005) were plotted. The tendency that deeper regions have smaller inventory of radionuclides is also seen in the figure, and a station in the deep part of the Yamato Basin (water depth: 2600 m) exhibited large inventories sporadically.…”

“…Nagaya and Nakamura, 1987;Lee et al, 1998;Hong et al, 1999;Pettersson et al, 1999;Lee, S.-H. et al, 2003;Zheng and Yamada, 2005). However, few studies concerning transport/accumulation processes of particulate radionuclides throughout the Japan Sea have carried out because of its intricate diplomatic borders.…”