Plutonium concentration and 240Pu/239Pu atomic ratio in liver of squid collected in the coastal sea areas of Japan

Abstract

9Plutonium isotopes,

Plutonium isotopes concentration in seawater and bottom sediment off the Pacific coast of Aomori sea area during 1991–2005

“…Numerous studies have been made to determine the levels and inventory of 239þ240 Pu in the ocean. In recent years, not only 239þ240 Pu concentrations but the 240 Pu/ 239 Pu atom ratio has become increasingly important in monitoring programs and oceanographic investigations, because the atom ratio can be used as a fingerprinting tool for identifying the origins and behavior in the ocean (Buesseler, 1997;Kim et al, 2003Kim et al, , 2004Muramatsu et al, 2001;Oikawa and Yamamoto, 2007;Yamada et al, 2006Yamada et al, , 2007Zheng and Yamada, 2004, 2005a. Misonoh et al (2006) had already summarized and outlined the data on 239þ240 Pu radioactivity concentrations in seawater and bottom sediment samples collected during 1991e2004 in this monitoring program still in progress.…”